* Re:Announce: unlimited number of shared snapshots [not found] <492FAF1C.8080401@gluesys.com> @ 2008-11-28 19:54 ` Mikulas Patocka [not found] ` <4933684F.9060606@gluesys.com> 0 siblings, 1 reply; 5+ messages in thread From: Mikulas Patocka @ 2008-11-28 19:54 UTC (permalink / raw) To: hgichon; +Cc: dm-devel Oh, sorry, there was a bug with big devices. I uploaded new patches at the same location, try them. (there's another fix for bug when sector size is smaller than chunk size in these new patches) BTW. for good performance, make sure that the size of your origin partition is aligned to the chunk size --- otherwise, there's a serious inefficiency in the kernel; if you use it over a partition with odd number of sectors, the kernel will split all IOs to 512 bytes and it'll be very slow. Mikulas > Hi Mikulas > Thanks for your job. > > In my vmware ESXi guest OS (linux-2.6.28-rc5), the multisnap was crashed. > > dd if=/dev/zero of=/dev/LD/snap bs=4096 count=1 > echo 0 `blockdev --getsize /dev/mapper/LD-ori` multisnapshot > /dev/mapper/LD-ori /dev/mapper/LD-snap 4096|dmsetup create ms > > [ 298.050106] ------------[ cut here ]------------ > [ 298.050106] kernel BUG at drivers/md/dm-bufio.c:156! > [ 298.050106] invalid opcode: 0000 [#1] SMP [ 298.050106] last sysfs file: > /sys/block/sde/dev > [ 298.050106] CPU 0 [ 298.050106] Modules linked in: dm_multisnapshot > hangcheck_timer e1000 e1000e megaraid_sas megaraid_mbox megaraid_mm mptsas > mptspi mptscsih mptctl mptbase dm_mod scsi_transport_sas scsi_transport_spi > sd_mod > [ 298.050106] Pid: 1759, comm: dmsetup Not tainted 2.6.28-rc5-1128 #1 > [ 298.050106] RIP: 0010:[<ffffffffa002dae4>] [<ffffffffa002dae4>] > get_unclaimed_buffer+0xd4/0x130 [dm_mod] > [ 298.050106] RSP: 0018:ffff8800165edb28 EFLAGS: 00010202 > [ 298.050106] RAX: 0000000000000004 RBX: ffff880016219f00 RCX: > ffff880016219f10 > [ 298.050106] RDX: 0000000000000902 RSI: 0000000000000001 RDI: > ffff880016219f40 > [ 298.050106] RBP: ffff88001624e000 R08: ffff88001624e000 R09: > ffff8800173ca000 > [ 298.050106] R10: 0000000000000003 R11: 0000000000000000 R12: > 0000000000000001 > [ 298.050106] R13: ffff88001624e000 R14: 000000000020c401 R15: > ffff88001624e020 > [ 298.050106] FS: 00007fd02c0356f0(0000) GS:ffffffff80658800(0000) > knlGS:0000000000000000 > [ 298.050106] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 298.050106] CR2: 00007f47f4405590 CR3: 00000000160f6000 CR4: > 00000000000006a0 > [ 298.050106] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > 0000000000000000 > [ 298.050106] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > 0000000000000400 > [ 298.050106] Process dmsetup (pid: 1759, threadinfo ffff8800165ec000, task > ffff880025174c20) > [ 298.050106] Stack: > [ 298.050106] 0000000000000000 ffff880016227000 ffff880016219f00 > ffffffffa002deab > [ 298.050106] ffff88001624e860 ffff88001624e068 0000000000000286 > ffff8800165edc18 > [ 298.050106] 0000000000000000 ffff880025174c20 ffffffff8022b950 > 0000000000000000 > [ 298.050106] Call Trace: > [ 298.050106] [<ffffffffa002deab>] ? dm_bufio_new_read+0x2ab/0x2f0 [dm_mod] > [ 298.050106] [<ffffffff8022b950>] ? default_wake_function+0x0/0x10 > [ 298.050106] [<ffffffffa00e0918>] ? multisnap_origin_ctr+0x4f8/0xc90 > [dm_multisnapshot] > [ 298.050106] [<ffffffffa002932b>] ? dm_table_add_target+0x18b/0x3c0 > [dm_mod] > [ 298.050106] [<ffffffffa002b2ff>] ? table_load+0xaf/0x210 [dm_mod] > [ 298.050106] [<ffffffff8027b28d>] ? __vmalloc_area_node+0xbd/0x130 > [ 298.050106] [<ffffffffa002b250>] ? table_load+0x0/0x210 [dm_mod] > [ 298.050106] [<ffffffffa002c0d1>] ? dm_ctl_ioctl+0x251/0x2c0 [dm_mod] > [ 298.050106] [<ffffffff8029784f>] ? vfs_ioctl+0x2f/0xa0 > [ 298.050106] [<ffffffff80297c00>] ? do_vfs_ioctl+0x340/0x470 > [ 298.050106] [<ffffffff80297d79>] ? sys_ioctl+0x49/0x80 > [ 298.050106] [<ffffffff8020c10b>] ? system_call_fastpath+0x16/0x1b > [ 298.050106] Code: 54 a8 02 74 aa 45 85 e4 74 e9 f6 07 02 74 a0 b9 02 00 00 > 00 48 c7 c2 20 d9 02 a0 be 01 00 00 00 e8 42 fe 4b e0 eb 88 0f 0b eb fe <0f> > 0b eb fe 31 db eb 84 45 85 e4 90 0f 84 60 ff ff ff b9 02 00 [ 298.050106] RIP > [<ffffffffa002dae4>] get_unclaimed_buffer+0xd4/0x130 [dm_mod] > [ 298.050106] RSP <ffff8800165edb28> > [ 298.218349] ---[ end trace 9642e91f49f4b2b1 ]--- > #dmsetup ls > LD-snap (254, 1) > LD-ori (254, 0) > ms (254, 2) > #ls /dev/mapper/ > LD-ori LD-snap control > #vgdisplay -v Finding all volume groups > Finding volume group "LD" > --- Volume group --- > VG Name LD > System ID Format lvm2 > Metadata Areas 8 > Metadata Sequence No 3 > VG Access read/write > VG Status resizable > MAX LV 0 > Cur LV 2 > Open LV 2 > Max PV 0 > Cur PV 4 > Act PV 4 > VG Size 53.98 GB > PE Size 4.00 MB > Total PE 13820 > Alloc PE / Size 13312 / 52.00 GB > Free PE / Size 508 / 1.98 GB > VG UUID r0hOuU-L4I0-V3Zy-hK10-TtJe-toBw-9BDpCY > --- Logical volume --- > LV Name /dev/LD/ori > VG Name LD > LV UUID LXOLcd-oPdk-xXoq-ZmK6-B4Qd-z8y6-Vf1WZ8 > LV Write Access read/write > LV Status available > # open 1 > LV Size 26.00 GB > Current LE 6656 > Segments 1 > Allocation inherit > Read ahead sectors auto > - currently set to 256 > Block device 254:0 > --- Logical volume --- > LV Name /dev/LD/snap > VG Name LD > LV UUID MlgpYW-AbNZ-7DMd-BEmc-RNiz-wmsa-vNiq1m > LV Write Access read/write > LV Status available > # open 1 > LV Size 26.00 GB > Current LE 6656 > Segments 4 > Allocation inherit > Read ahead sectors auto > - currently set to 256#vgdisplay -v Finding all volume groups > Finding volume group "LD" > --- Volume group --- > VG Name LD > System ID Format lvm2 > Metadata Areas 8 > Metadata Sequence No 3 > VG Access read/write > VG Status resizable > MAX LV 0 > Cur LV 2 > Open LV 2 > Max PV 0 > Cur PV 4 > Act PV 4 > VG Size 53.98 GB > PE Size 4.00 MB > Total PE 13820 > Alloc PE / Size 13312 / 52.00 GB > Free PE / Size 508 / 1.98 GB > VG UUID r0hOuU-L4I0-V3Zy-hK10-TtJe-toBw-9BDpCY > --- Logical volume --- > LV Name /dev/LD/ori > VG Name LD > LV UUID LXOLcd-oPdk-xXoq-ZmK6-B4Qd-z8y6-Vf1WZ8 > LV Write Access read/write > LV Status available > # open 1 > LV Size 26.00 GB > Current LE 6656 > Segments 1 > Allocation inherit > Read ahead sectors auto > - currently set to 256 > Block device 254:0 > --- Logical volume --- > LV Name /dev/LD/snap > VG Name LD > LV UUID MlgpYW-AbNZ-7DMd-BEmc-RNiz-wmsa-vNiq1m > LV Write Access read/write > LV Status available > # open 1 > LV Size 26.00 GB > Current LE 6656 > Segments 4 > Allocation inherit > Read ahead sectors auto > - currently set to 256 > Block device 254:1 > --- Physical volumes --- > PV Name /dev/sda PV UUID > lc8iKg-WrqG-XWyL-t6TW-TtPj-HQn1-pgbtku > PV Status allocatable > Total PE / Free PE 7679 / 508 > PV Name /dev/sdc PV UUID > bbHAWq-adBj-ACcU-5Bp6-LM2Y-r5M6-9ncvGc > PV Status allocatable > Total PE / Free PE 2047 / 0 > PV Name /dev/sdd PV UUID > 5B7gOQ-KKuk-XtHm-6FSr-11Q4-2p7y-lr2xGP > PV Status allocatable > Total PE / Free PE 2047 / 0 > PV Name /dev/sde PV UUID > kXUvPh-gsVN-oQln-CiMu-XdR2-C1Xd-DgLtjb > PV Status allocatable > Total PE / Free PE 2047 / 0 > > Block device 254:1 > --- Physical volumes --- > PV Name /dev/sda PV UUID > lc8iKg-WrqG-XWyL-t6TW-TtPj-HQn1-pgbtku > PV Status allocatable > Total PE / Free PE 7679 / 508 > PV Name /dev/sdc PV UUID > bbHAWq-adBj-ACcU-5Bp6-LM2Y-r5M6-9ncvGc > PV Status allocatable > Total PE / Free PE 2047 / 0 > PV Name /dev/sdd PV UUID > 5B7gOQ-KKuk-XtHm-6FSr-11Q4-2p7y-lr2xGP > PV Status allocatable > Total PE / Free PE 2047 / 0 > PV Name /dev/sde PV UUID > kXUvPh-gsVN-oQln-CiMu-XdR2-C1Xd-DgLtjb > PV Status allocatable > Total PE / Free PE 2047 / 0 > > What's wrong with my test? > > best regards > ^ permalink raw reply [flat|nested] 5+ messages in thread
[parent not found: <4933684F.9060606@gluesys.com>]
* Re: Announce: unlimited number of shared snapshots [not found] ` <4933684F.9060606@gluesys.com> @ 2008-12-02 7:05 ` Mikulas Patocka 2008-12-02 7:34 ` Christoph Hellwig [not found] ` <4936187D.1000302@gluesys.com> 0 siblings, 2 replies; 5+ messages in thread From: Mikulas Patocka @ 2008-12-02 7:05 UTC (permalink / raw) To: hgichon; +Cc: dm-devel Hi I fixed the ext2 bug (it was unsupported handling of buffer readahead) --- download the new version of patches from the same location. I couldn't reproduce the XFS bug. Please retry. Are you sure that you didn't try to mount the _snapshot_ as XFS? Snapshots are currently not writeable (they will be writeable in the final version), so attempting to mount the snapshot read/write would return i/o error to the filesystem and produce an error message similar to the one displayed. Thanks for testing it. Mikulas > hm... there is no difference. > so.. i used small lv size. snapshot creation is successful!! > > with xfs > there is snapshot device mount problem. > [ 2696.337759] Filesystem "dm-3": Disabling barriers, trial barrier write > failed > [ 2696.345517] XFS mounting filesystem dm-3 > [ 2696.356009] xfs_force_shutdown(dm-3,0x1) called from line 420 of file > fs/xfs/xfs_rw.c. Return address = 0xffffffff8037d399 > [ 2696.363710] Filesystem "dm-3": I/O Error Detected. Shutting down > filesystem: dm-3 > [ 2696.368085] Please umount the filesystem, and rectify the problem(s) > [ 2696.371756] I/O error in filesystem ("dm-3") meta-data dev dm-3 block > 0x200022 ("xlog_bwrite") error 5 buf count 2097152 > [ 2696.378402] XFS: failed to locate log tail > [ 2696.380797] XFS: log mount/recovery failed: error 5 > [ 2696.405586] XFS: log mount failed > > with ext2 > mount is ok!! > In origin io (cp -a /etc /origin-dev/, however kernel oops detected! > But cp is successful, and then another snapshot create command (dmsetup > message /dev/mapper/ms 3 create) hang forever. > > > [ 2782.652061] lost page write due to I/O error on dm-3 > [ 2788.134652] ------------[ cut here ]------------ > [ 2788.135559] kernel BUG at drivers/md/dm-multisnap-io.c:267! > [ 2788.135559] invalid opcode: 0000 [#1] SMP > [ 2788.135559] last sysfs file: /sys/block/sde/dev > [ 2788.135559] CPU 0 > [ 2788.135559] Modules linked in: dm_multisnapshot hangcheck_timer e1000 > e1000e megaraid_sas megaraid_mbox megaraid_mm mptsas mptspi mptscsih mptctl > mptbase dm_mod scsi_transport_sas scsi_transport_spi sd_mod > [ 2788.135559] Pid: 4299, comm: kmultisnapd Not tainted 2.6.28-rc5-1128 #1 > [ 2788.135559] RIP: 0010:[<ffffffffa00e4178>] [<ffffffffa00e4178>] > dm_multisnap_process_bios+0x278/0x600 [dm_multisnapshot] > [ 2788.135559] RSP: 0018:ffff88001fa77c90 EFLAGS: 00010202 > [ 2788.135559] RAX: 0000000000000001 RBX: ffff88001f8be000 RCX: > ffff88001f8be0b0 > [ 2788.135559] RDX: ffff88001fa52808 RSI: ffff88001fa77ed0 RDI: > ffffffffa00e7d80 > [ 2788.135559] RBP: 00000000ffffffff R08: ffff88001fa76000 R09: > 0000000000000001 > [ 2788.135559] R10: 0000000000000000 R11: 0000000000000000 R12: > ffff88001f8be0a8 > [ 2788.135559] R13: ffff880023cdd900 R14: 0000000000000000 R15: > ffff88001fa77e30 > [ 2788.135559] FS: 0000000000000000(0000) GS:ffffffff80658800(0000) > knlGS:0000000000000000 > [ 2788.135559] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b > [ 2788.135559] CR2: 00007f973b475550 CR3: 000000001e11a000 CR4: > 00000000000006a0 > [ 2788.135559] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > 0000000000000000 > [ 2788.135559] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > 0000000000000400 > [ 2788.135559] Process kmultisnapd (pid: 4299, threadinfo ffff88001fa76000, > task ffff880025175700) > [ 2788.135559] Stack: > [ 2788.135559] ffff880023d58838 ffff88001bf6f800 ffff88001fa77ce0 > ffff880023dc54d0 > [ 2788.135559] 0000000000000086 ffff88001bf6f800 ffff88001bf6f800 > 0000000000000000 > [ 2788.135559] 0000000000000000 ffff880023daac00 ffff880023dc54a0 > 0000000000000000 > [ 2788.135559] Call Trace: > [ 2788.135559] [<ffffffff804eee34>] ? _spin_unlock_irqrestore+0x4/0x10 > [ 2788.135559] [<ffffffff80228a61>] ? update_curr+0x51/0xb0 > [ 2788.135559] [<ffffffff8022eee0>] ? dequeue_task_fair+0xd0/0xf0 > [ 2788.135559] [<ffffffff80243af0>] ? worker_thread+0x0/0xb0 > [ 2788.135559] [<ffffffff8022b2ad>] ? __dequeue_entity+0x3d/0x50 > [ 2788.135559] [<ffffffff8022b2e5>] ? set_next_entity+0x25/0x50 > [ 2788.135559] [<ffffffff804ecf71>] ? thread_return+0x3a/0x5c9 > [ 2788.135559] [<ffffffffa00e4500>] ? dm_multisnap_work+0x0/0xb0 > [dm_multisnapshot] > [ 2788.135559] [<ffffffffa00e4533>] ? dm_multisnap_work+0x33/0xb0 > [dm_multisnapshot] > [ 2788.135559] [<ffffffffa00e4500>] ? dm_multisnap_work+0x0/0xb0 > [dm_multisnapshot] > [ 2788.135559] [<ffffffff8024302e>] ? run_workqueue+0xbe/0x150 > [ 2788.135559] [<ffffffff80243af0>] ? worker_thread+0x0/0xb0 > [ 2788.135559] [<ffffffff80243af0>] ? worker_thread+0x0/0xb0 > [ 2788.135559] [<ffffffff80243b5d>] ? worker_thread+0x6d/0xb0 > [ 2788.135559] [<ffffffff80246d80>] ? autoremove_wake_function+0x0/0x30 > [ 2788.135559] [<ffffffff80243af0>] ? worker_thread+0x0/0xb0 > [ 2788.135559] [<ffffffff80243af0>] ? worker_thread+0x0/0xb0 > [ 2788.135559] [<ffffffff8024696b>] ? kthread+0x4b/0x80 > [ 2788.135559] [<ffffffff8020cff9>] ? child_rip+0xa/0x11 > [ 2788.135559] [<ffffffff80246920>] ? kthread+0x0/0x80 > [ 2788.135559] [<ffffffff8020cfef>] ? child_rip+0x0/0x11 > [ 2788.135559] Code: 8d b3 a8 00 00 00 e8 08 f9 15 e0 e9 55 ff ff ff 0f 1f 00 > 8d 72 01 e9 4a fe ff ff 48 c7 83 d0 00 00 00 00 00 00 00 e9 e3 fd ff ff <0f> > 0b eb fe 0f 1f 40 00 48 89 df e8 88 be ff ff 85 c0 0f 85 07 > [ 2788.135559] RIP [<ffffffffa00e4178>] dm_multisnap_process_bios+0x278/0x600 > [dm_multisnapshot] > [ 2788.135559] RSP <ffff88001fa77c90> > [ 2788.324941] ---[ end trace cca5fac1560b5d2c ]--- > > > > > best regards. > > Mikulas Patocka wrote: > > Oh, sorry, there was a bug with big devices. I uploaded new patches at the > > same location, try them. (there's another fix for bug when sector size is > > smaller than chunk size in these new patches) > > > > BTW. for good performance, make sure that the size of your origin partition > > is aligned to the chunk size --- otherwise, there's a serious inefficiency > > in the kernel; if you use it over a partition with odd number of sectors, > > the kernel will split all IOs to 512 bytes and it'll be very slow. > > > > Mikulas > > > > > > > Hi Mikulas > > > Thanks for your job. > > > > > > In my vmware ESXi guest OS (linux-2.6.28-rc5), the multisnap was crashed. > > > > > > dd if=/dev/zero of=/dev/LD/snap bs=4096 count=1 > > > echo 0 `blockdev --getsize /dev/mapper/LD-ori` multisnapshot > > > /dev/mapper/LD-ori /dev/mapper/LD-snap 4096|dmsetup create ms > > > > > > [ 298.050106] ------------[ cut here ]------------ > > > [ 298.050106] kernel BUG at drivers/md/dm-bufio.c:156! > > > [ 298.050106] invalid opcode: 0000 [#1] SMP [ 298.050106] last sysfs > > > file: > > > /sys/block/sde/dev > > > [ 298.050106] CPU 0 [ 298.050106] Modules linked in: dm_multisnapshot > > > hangcheck_timer e1000 e1000e megaraid_sas megaraid_mbox megaraid_mm mptsas > > > mptspi mptscsih mptctl mptbase dm_mod scsi_transport_sas > > > scsi_transport_spi > > > sd_mod > > > [ 298.050106] Pid: 1759, comm: dmsetup Not tainted 2.6.28-rc5-1128 #1 > > > [ 298.050106] RIP: 0010:[<ffffffffa002dae4>] [<ffffffffa002dae4>] > > > get_unclaimed_buffer+0xd4/0x130 [dm_mod] > > > [ 298.050106] RSP: 0018:ffff8800165edb28 EFLAGS: 00010202 > > > [ 298.050106] RAX: 0000000000000004 RBX: ffff880016219f00 RCX: > > > ffff880016219f10 > > > [ 298.050106] RDX: 0000000000000902 RSI: 0000000000000001 RDI: > > > ffff880016219f40 > > > [ 298.050106] RBP: ffff88001624e000 R08: ffff88001624e000 R09: > > > ffff8800173ca000 > > > [ 298.050106] R10: 0000000000000003 R11: 0000000000000000 R12: > > > 0000000000000001 > > > [ 298.050106] R13: ffff88001624e000 R14: 000000000020c401 R15: > > > ffff88001624e020 > > > [ 298.050106] FS: 00007fd02c0356f0(0000) GS:ffffffff80658800(0000) > > > knlGS:0000000000000000 > > > [ 298.050106] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > > > [ 298.050106] CR2: 00007f47f4405590 CR3: 00000000160f6000 CR4: > > > 00000000000006a0 > > > [ 298.050106] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > > > 0000000000000000 > > > [ 298.050106] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > > > 0000000000000400 > > > [ 298.050106] Process dmsetup (pid: 1759, threadinfo ffff8800165ec000, > > > task > > > ffff880025174c20) > > > [ 298.050106] Stack: > > > [ 298.050106] 0000000000000000 ffff880016227000 ffff880016219f00 > > > ffffffffa002deab > > > [ 298.050106] ffff88001624e860 ffff88001624e068 0000000000000286 > > > ffff8800165edc18 > > > [ 298.050106] 0000000000000000 ffff880025174c20 ffffffff8022b950 > > > 0000000000000000 > > > [ 298.050106] Call Trace: > > > [ 298.050106] [<ffffffffa002deab>] ? dm_bufio_new_read+0x2ab/0x2f0 > > > [dm_mod] > > > [ 298.050106] [<ffffffff8022b950>] ? default_wake_function+0x0/0x10 > > > [ 298.050106] [<ffffffffa00e0918>] ? multisnap_origin_ctr+0x4f8/0xc90 > > > [dm_multisnapshot] > > > [ 298.050106] [<ffffffffa002932b>] ? dm_table_add_target+0x18b/0x3c0 > > > [dm_mod] > > > [ 298.050106] [<ffffffffa002b2ff>] ? table_load+0xaf/0x210 [dm_mod] > > > [ 298.050106] [<ffffffff8027b28d>] ? __vmalloc_area_node+0xbd/0x130 > > > [ 298.050106] [<ffffffffa002b250>] ? table_load+0x0/0x210 [dm_mod] > > > [ 298.050106] [<ffffffffa002c0d1>] ? dm_ctl_ioctl+0x251/0x2c0 [dm_mod] > > > [ 298.050106] [<ffffffff8029784f>] ? vfs_ioctl+0x2f/0xa0 > > > [ 298.050106] [<ffffffff80297c00>] ? do_vfs_ioctl+0x340/0x470 > > > [ 298.050106] [<ffffffff80297d79>] ? sys_ioctl+0x49/0x80 > > > [ 298.050106] [<ffffffff8020c10b>] ? system_call_fastpath+0x16/0x1b > > > [ 298.050106] Code: 54 a8 02 74 aa 45 85 e4 74 e9 f6 07 02 74 a0 b9 02 00 > > > 00 > > > 00 48 c7 c2 20 d9 02 a0 be 01 00 00 00 e8 42 fe 4b e0 eb 88 0f 0b eb fe > > > <0f> > > > 0b eb fe 31 db eb 84 45 85 e4 90 0f 84 60 ff ff ff b9 02 00 [ 298.050106] > > > RIP > > > [<ffffffffa002dae4>] get_unclaimed_buffer+0xd4/0x130 [dm_mod] > > > [ 298.050106] RSP <ffff8800165edb28> > > > [ 298.218349] ---[ end trace 9642e91f49f4b2b1 ]--- > > > #dmsetup ls > > > LD-snap (254, 1) > > > LD-ori (254, 0) > > > ms (254, 2) > > > #ls /dev/mapper/ > > > LD-ori LD-snap control #vgdisplay -v Finding all volume groups > > > Finding volume group "LD" > > > --- Volume group --- > > > VG Name LD > > > System ID Format lvm2 > > > Metadata Areas 8 > > > Metadata Sequence No 3 > > > VG Access read/write > > > VG Status resizable > > > MAX LV 0 > > > Cur LV 2 > > > Open LV 2 > > > Max PV 0 > > > Cur PV 4 > > > Act PV 4 > > > VG Size 53.98 GB > > > PE Size 4.00 MB > > > Total PE 13820 > > > Alloc PE / Size 13312 / 52.00 GB > > > Free PE / Size 508 / 1.98 GB > > > VG UUID r0hOuU-L4I0-V3Zy-hK10-TtJe-toBw-9BDpCY > > > --- Logical volume --- > > > LV Name /dev/LD/ori > > > VG Name LD > > > LV UUID LXOLcd-oPdk-xXoq-ZmK6-B4Qd-z8y6-Vf1WZ8 > > > LV Write Access read/write > > > LV Status available > > > # open 1 > > > LV Size 26.00 GB > > > Current LE 6656 > > > Segments 1 > > > Allocation inherit > > > Read ahead sectors auto > > > - currently set to 256 > > > Block device 254:0 > > > --- Logical volume --- > > > LV Name /dev/LD/snap > > > VG Name LD > > > LV UUID MlgpYW-AbNZ-7DMd-BEmc-RNiz-wmsa-vNiq1m > > > LV Write Access read/write > > > LV Status available > > > # open 1 > > > LV Size 26.00 GB > > > Current LE 6656 > > > Segments 4 > > > Allocation inherit > > > Read ahead sectors auto > > > - currently set to 256#vgdisplay -v Finding all volume groups > > > Finding volume group "LD" > > > --- Volume group --- > > > VG Name LD > > > System ID Format lvm2 > > > Metadata Areas 8 > > > Metadata Sequence No 3 > > > VG Access read/write > > > VG Status resizable > > > MAX LV 0 > > > Cur LV 2 > > > Open LV 2 > > > Max PV 0 > > > Cur PV 4 > > > Act PV 4 > > > VG Size 53.98 GB > > > PE Size 4.00 MB > > > Total PE 13820 > > > Alloc PE / Size 13312 / 52.00 GB > > > Free PE / Size 508 / 1.98 GB > > > VG UUID r0hOuU-L4I0-V3Zy-hK10-TtJe-toBw-9BDpCY > > > --- Logical volume --- > > > LV Name /dev/LD/ori > > > VG Name LD > > > LV UUID LXOLcd-oPdk-xXoq-ZmK6-B4Qd-z8y6-Vf1WZ8 > > > LV Write Access read/write > > > LV Status available > > > # open 1 > > > LV Size 26.00 GB > > > Current LE 6656 > > > Segments 1 > > > Allocation inherit > > > Read ahead sectors auto > > > - currently set to 256 > > > Block device 254:0 > > > --- Logical volume --- > > > LV Name /dev/LD/snap > > > VG Name LD > > > LV UUID MlgpYW-AbNZ-7DMd-BEmc-RNiz-wmsa-vNiq1m > > > LV Write Access read/write > > > LV Status available > > > # open 1 > > > LV Size 26.00 GB > > > Current LE 6656 > > > Segments 4 > > > Allocation inherit > > > Read ahead sectors auto > > > - currently set to 256 > > > Block device 254:1 > > > --- Physical volumes --- > > > PV Name /dev/sda PV UUID > > > lc8iKg-WrqG-XWyL-t6TW-TtPj-HQn1-pgbtku > > > PV Status allocatable > > > Total PE / Free PE 7679 / 508 > > > PV Name /dev/sdc PV UUID > > > bbHAWq-adBj-ACcU-5Bp6-LM2Y-r5M6-9ncvGc > > > PV Status allocatable > > > Total PE / Free PE 2047 / 0 > > > PV Name /dev/sdd PV UUID > > > 5B7gOQ-KKuk-XtHm-6FSr-11Q4-2p7y-lr2xGP > > > PV Status allocatable > > > Total PE / Free PE 2047 / 0 > > > PV Name /dev/sde PV UUID > > > kXUvPh-gsVN-oQln-CiMu-XdR2-C1Xd-DgLtjb > > > PV Status allocatable > > > Total PE / Free PE 2047 / 0 > > > > > > Block device 254:1 > > > --- Physical volumes --- > > > PV Name /dev/sda PV UUID > > > lc8iKg-WrqG-XWyL-t6TW-TtPj-HQn1-pgbtku > > > PV Status allocatable > > > Total PE / Free PE 7679 / 508 > > > PV Name /dev/sdc PV UUID > > > bbHAWq-adBj-ACcU-5Bp6-LM2Y-r5M6-9ncvGc > > > PV Status allocatable > > > Total PE / Free PE 2047 / 0 > > > PV Name /dev/sdd PV UUID > > > 5B7gOQ-KKuk-XtHm-6FSr-11Q4-2p7y-lr2xGP > > > PV Status allocatable > > > Total PE / Free PE 2047 / 0 > > > PV Name /dev/sde PV UUID > > > kXUvPh-gsVN-oQln-CiMu-XdR2-C1Xd-DgLtjb > > > PV Status allocatable > > > Total PE / Free PE 2047 / 0 > > > > > > What's wrong with my test? > > > > > > best regards > > > > > > > > > > > > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Announce: unlimited number of shared snapshots 2008-12-02 7:05 ` Announce: " Mikulas Patocka @ 2008-12-02 7:34 ` Christoph Hellwig [not found] ` <4936187D.1000302@gluesys.com> 1 sibling, 0 replies; 5+ messages in thread From: Christoph Hellwig @ 2008-12-02 7:34 UTC (permalink / raw) To: Mikulas Patocka; +Cc: dm-devel, hgichon On Tue, Dec 02, 2008 at 02:05:28AM -0500, Mikulas Patocka wrote: > Hi > > I fixed the ext2 bug (it was unsupported handling of buffer readahead) --- > download the new version of patches from the same location. > > I couldn't reproduce the XFS bug. Please retry. Are you sure that you > didn't try to mount the _snapshot_ as XFS? Snapshots are currently not > writeable (they will be writeable in the final version), so attempting to > mount the snapshot read/write would return i/o error to the filesystem and > produce an error message similar to the one displayed. The error message definitively looks like trying to mount a r/o snapshots without -o ro,norecovery: > > fs/xfs/xfs_rw.c. Return address = 0xffffffff8037d399 > > [ 2696.363710] Filesystem "dm-3": I/O Error Detected. Shutting down > > filesystem: dm-3 > > [ 2696.368085] Please umount the filesystem, and rectify the problem(s) > > [ 2696.371756] I/O error in filesystem ("dm-3") meta-data dev dm-3 block > > 0x200022 ("xlog_bwrite") error 5 buf count 2097152 > > [ 2696.378402] XFS: failed to locate log tail > > [ 2696.380797] XFS: log mount/recovery failed: error 5 > > [ 2696.405586] XFS: log mount failed ^ permalink raw reply [flat|nested] 5+ messages in thread
[parent not found: <4936187D.1000302@gluesys.com>]
* Re: Announce: unlimited number of shared snapshots [not found] ` <4936187D.1000302@gluesys.com> @ 2008-12-04 3:27 ` Mikulas Patocka 0 siblings, 0 replies; 5+ messages in thread From: Mikulas Patocka @ 2008-12-04 3:27 UTC (permalink / raw) To: hgichon; +Cc: dm-devel, Klaus Kim, nst On Wed, 3 Dec 2008, hgichon wrote: > ok, i found norecovery option for mouting XFS. > > I make a some script for testing shared snapshots. It's simple. > - create multisnap target > - mkfs.xfs target / mount > - loop ( cp /etc /target/$cnt... ; create multisnap-snap target ID $cnt; $cnt > increased ) > > I want to see > - snapshot creation time? > - preserved snapshot image exactly? > > I created more than 90 snapshot target, however there is no snapshot creation > delay. WOW > In checking the preserved snapshot images, but there is some problem. > > 1. When snapshot number is more than 97, Input/Output errors occurred in > original volume. > - In that time, snapshot overflow occurred maybe. > > I attached my simple script and result. This is definitely caused by snapshot overflow. See this: ms: 0 4194304 multisnapshot 28 103 524288 524281 46399 ^^^^^^^^^^^^^ It's the total and allocated number of chunks. Currently, it behaves in such a way that it prevents writing to the origin, I may add more error handling modes in the future. > 2. With below df dump, copy data was updated abnormally. What exactly do you mean? Technically, you can get filesystem inconsistency in the snapshot if you take snapshot of a mounted filesystem. You should suspend the origin device with "dmsetup suspend" and resume with "dmsetup resume" it after taking the snapshot. Be aware to suspend only for brief period of time on unloaded system, as there is a deadlock possibility when running with suspended filesystem. xfs and ext3 will clean-up themselves when suspending. For ext2, there's no way to get a clean snapshot, it's ext2 design limitation, even on old snapshots you get inconsistent snapshots when snapshotting mounted ext2 filesystem. Mikulas > best regards. > > # df > Filesystem Size Used Avail Use% Mounted on > /dev/sdb1 5.0G 646M 4.1G 14% / > /dev/sdb2 5.0G 244M 4.5G 6% /var > none 292M 120K 292M 1% /dev/shm > /dev/mapper/ms 2.0G 1.5G 595M 71% /mnt/ms > /dev/mapper/ms0 2.0G 4.2M 2.0G 1% /mnt/ms0 > /dev/mapper/ms1 2.0G 4.2M 2.0G 1% /mnt/ms1 > /dev/mapper/ms2 2.0G 20M 2.0G 1% /mnt/ms2 > /dev/mapper/ms3 2.0G 20M 2.0G 1% /mnt/ms3 > /dev/mapper/ms4 2.0G 20M 2.0G 1% /mnt/ms4 > /dev/mapper/ms5 2.0G 20M 2.0G 1% /mnt/ms5 > /dev/mapper/ms6 2.0G 82M 2.0G 5% /mnt/ms6 > /dev/mapper/ms7 2.0G 4.2M 2.0G 1% /mnt/ms7 > /dev/mapper/ms8 2.0G 4.2M 2.0G 1% /mnt/ms8 > /dev/mapper/ms9 2.0G 4.2M 2.0G 1% /mnt/ms9 > /dev/mapper/ms10 2.0G 38M 2.0G 2% /mnt/ms10 > /dev/mapper/ms11 2.0G 38M 2.0G 2% /mnt/ms11 > /dev/mapper/ms12 2.0G 38M 2.0G 2% /mnt/ms12 > /dev/mapper/ms13 2.0G 89M 2.0G 5% /mnt/ms13 > /dev/mapper/ms14 2.0G 89M 2.0G 5% /mnt/ms14 > /dev/mapper/ms15 2.0G 89M 2.0G 5% /mnt/ms15 > /dev/mapper/ms16 2.0G 89M 2.0G 5% /mnt/ms16 > /dev/mapper/ms17 2.0G 138M 1.9G 7% /mnt/ms17 > /dev/mapper/ms18 2.0G 138M 1.9G 7% /mnt/ms18 > /dev/mapper/ms19 2.0G 138M 1.9G 7% /mnt/ms19 > /dev/mapper/ms20 2.0G 138M 1.9G 7% /mnt/ms20 > /dev/mapper/ms21 2.0G 211M 1.8G 11% /mnt/ms21 > /dev/mapper/ms22 2.0G 211M 1.8G 11% /mnt/ms22 > /dev/mapper/ms23 2.0G 211M 1.8G 11% /mnt/ms23 > /dev/mapper/ms24 2.0G 211M 1.8G 11% /mnt/ms24 > /dev/mapper/ms25 2.0G 211M 1.8G 11% /mnt/ms25 > /dev/mapper/ms26 2.0G 270M 1.8G 14% /mnt/ms26 > /dev/mapper/ms27 2.0G 270M 1.8G 14% /mnt/ms27 > /dev/mapper/ms28 2.0G 270M 1.8G 14% /mnt/ms28 > /dev/mapper/ms29 2.0G 270M 1.8G 14% /mnt/ms29 > /dev/mapper/ms30 2.0G 334M 1.7G 17% /mnt/ms30 > /dev/mapper/ms31 2.0G 334M 1.7G 17% /mnt/ms31 > /dev/mapper/ms32 2.0G 334M 1.7G 17% /mnt/ms32 > /dev/mapper/ms33 2.0G 389M 1.7G 20% /mnt/ms33 > /dev/mapper/ms34 2.0G 389M 1.7G 20% /mnt/ms34 > /dev/mapper/ms35 2.0G 389M 1.7G 20% /mnt/ms35 > /dev/mapper/ms36 2.0G 389M 1.7G 20% /mnt/ms36 > /dev/mapper/ms37 2.0G 437M 1.6G 22% /mnt/ms37 > /dev/mapper/ms38 2.0G 437M 1.6G 22% /mnt/ms38 > /dev/mapper/ms39 2.0G 437M 1.6G 22% /mnt/ms39 > /dev/mapper/ms40 2.0G 437M 1.6G 22% /mnt/ms40 > /dev/mapper/ms41 2.0G 494M 1.6G 25% /mnt/ms41 > /dev/mapper/ms42 2.0G 494M 1.6G 25% /mnt/ms42 > /dev/mapper/ms43 2.0G 494M 1.6G 25% /mnt/ms43 > /dev/mapper/ms44 2.0G 547M 1.5G 27% /mnt/ms44 > /dev/mapper/ms45 2.0G 547M 1.5G 27% /mnt/ms45 > /dev/mapper/ms46 2.0G 547M 1.5G 27% /mnt/ms46 > /dev/mapper/ms47 2.0G 596M 1.5G 30% /mnt/ms47 > /dev/mapper/ms48 2.0G 596M 1.5G 30% /mnt/ms48 > /dev/mapper/ms49 2.0G 596M 1.5G 30% /mnt/ms49 > /dev/mapper/ms50 2.0G 596M 1.5G 30% /mnt/ms50 > /dev/mapper/ms51 2.0G 644M 1.4G 32% /mnt/ms51 > /dev/mapper/ms52 2.0G 644M 1.4G 32% /mnt/ms52 > /dev/mapper/ms53 2.0G 644M 1.4G 32% /mnt/ms53 > /dev/mapper/ms54 2.0G 644M 1.4G 32% /mnt/ms54 > /dev/mapper/ms55 2.0G 698M 1.4G 35% /mnt/ms55 > /dev/mapper/ms56 2.0G 698M 1.4G 35% /mnt/ms56 > /dev/mapper/ms57 2.0G 698M 1.4G 35% /mnt/ms57 > /dev/mapper/ms58 2.0G 753M 1.3G 37% /mnt/ms58 > /dev/mapper/ms59 2.0G 753M 1.3G 37% /mnt/ms59 > /dev/mapper/ms60 2.0G 753M 1.3G 37% /mnt/ms60 > /dev/mapper/ms61 2.0G 804M 1.3G 40% /mnt/ms61 > /dev/mapper/ms62 2.0G 804M 1.3G 40% /mnt/ms62 > /dev/mapper/ms63 2.0G 804M 1.3G 40% /mnt/ms63 > /dev/mapper/ms64 2.0G 850M 1.2G 42% /mnt/ms64 > /dev/mapper/ms65 2.0G 850M 1.2G 42% /mnt/ms65 > /dev/mapper/ms66 2.0G 850M 1.2G 42% /mnt/ms66 > /dev/mapper/ms67 2.0G 887M 1.2G 44% /mnt/ms67 > /dev/mapper/ms68 2.0G 887M 1.2G 44% /mnt/ms68 > /dev/mapper/ms69 2.0G 887M 1.2G 44% /mnt/ms69 > /dev/mapper/ms70 2.0G 939M 1.1G 47% /mnt/ms70 > /dev/mapper/ms71 2.0G 939M 1.1G 47% /mnt/ms71 > /dev/mapper/ms72 2.0G 939M 1.1G 47% /mnt/ms72 > /dev/mapper/ms73 2.0G 983M 1.1G 49% /mnt/ms73 > /dev/mapper/ms74 2.0G 983M 1.1G 49% /mnt/ms74 > /dev/mapper/ms75 2.0G 983M 1.1G 49% /mnt/ms75 > /dev/mapper/ms76 2.0G 1.0G 1015M 51% /mnt/ms76 > /dev/mapper/ms77 2.0G 1.0G 1015M 51% /mnt/ms77 > /dev/mapper/ms78 2.0G 1.0G 1015M 51% /mnt/ms78 > /dev/mapper/ms79 2.0G 1.1G 970M 53% /mnt/ms79 > /dev/mapper/ms80 2.0G 1.1G 970M 53% /mnt/ms80 > /dev/mapper/ms81 2.0G 1.1G 970M 53% /mnt/ms81 > /dev/mapper/ms82 2.0G 1.1G 933M 55% /mnt/ms82 > /dev/mapper/ms83 2.0G 1.1G 933M 55% /mnt/ms83 > /dev/mapper/ms84 2.0G 1.1G 933M 55% /mnt/ms84 > /dev/mapper/ms85 2.0G 1.2G 890M 57% /mnt/ms85 > /dev/mapper/ms86 2.0G 1.2G 890M 57% /mnt/ms86 > /dev/mapper/ms87 2.0G 1.2G 890M 57% /mnt/ms87 > /dev/mapper/ms88 2.0G 1.2G 846M 59% /mnt/ms88 > /dev/mapper/ms89 2.0G 1.2G 846M 59% /mnt/ms89 > /dev/mapper/ms90 2.0G 1.2G 846M 59% /mnt/ms90 > /dev/mapper/ms91 2.0G 1.3G 809M 61% /mnt/ms91 > /dev/mapper/ms92 2.0G 1.3G 809M 61% /mnt/ms92 > /dev/mapper/ms93 2.0G 1.3G 763M 63% /mnt/ms93 > /dev/mapper/ms94 2.0G 1.3G 763M 63% /mnt/ms94 > /dev/mapper/ms95 2.0G 1.3G 763M 63% /mnt/ms95 > /dev/mapper/ms96 2.0G 1.3G 730M 65% /mnt/ms96 > > #dmsetup status > ms28: 0 4194304 multisnap-snap > ms13: 0 4194304 multisnap-snap > ms45: 0 4194304 multisnap-snap > ms30: 0 4194304 multisnap-snap > ms77: 0 4194304 multisnap-snap > ms62: 0 4194304 multisnap-snap > ms94: 0 4194304 multisnap-snap > ms3: 0 4194304 multisnap-snap > ms27: 0 4194304 multisnap-snap > ms12: 0 4194304 multisnap-snap > ms59: 0 4194304 multisnap-snap > ms44: 0 4194304 multisnap-snap > ms76: 0 4194304 multisnap-snap > ms61: 0 4194304 multisnap-snap > ms93: 0 4194304 multisnap-snap > ms2: 0 4194304 multisnap-snap > ms26: 0 4194304 multisnap-snap > ms11: 0 4194304 multisnap-snap > ms58: 0 4194304 multisnap-snap > ms43: 0 4194304 multisnap-snap > ms75: 0 4194304 multisnap-snap > ms60: 0 4194304 multisnap-snap > ms92: 0 4194304 multisnap-snap > ms1: 0 4194304 multisnap-snap > LD-snap: 0 4194304 linear > ms25: 0 4194304 multisnap-snap > ms10: 0 4194304 multisnap-snap > ms57: 0 4194304 multisnap-snap > ms42: 0 4194304 multisnap-snap > ms89: 0 4194304 multisnap-snap > ms74: 0 4194304 multisnap-snap > ms91: 0 4194304 multisnap-snap > ms0: 0 4194304 multisnap-snap > ms39: 0 4194304 multisnap-snap abnormally. > ms24: 0 4194304 multisnap-snap > ms56: 0 4194304 multisnap-snap > ms41: 0 4194304 multisnap-snap > ms88: 0 4194304 multisnap-snap > ms73: 0 4194304 multisnap-snap > ms90: 0 4194304 multisnap-snap > LD-ori: 0 4194304 linear > ms38: 0 4194304 multisnap-snap > ms23: 0 4194304 multisnap-snap > ms55: 0 4194304 multisnap-snap > ms40: 0 4194304 multisnap-snap > ms87: 0 4194304 multisnap-snap > ms72: 0 4194304 multisnap-snap > ms37: 0 4194304 multisnap-snap > ms22: 0 4194304 multisnap-snap > ms69: 0 4194304 multisnap-snap > ms54: 0 4194304 multisnap-snap > ms86: 0 4194304 multisnap-snap > ms71: 0 4194304 multisnap-snap > ms19: 0 4194304 multisnap-snap > ms36: 0 4194304 multisnap-snap > ms21: 0 4194304 multisnap-snap > ms68: 0 4194304 multisnap-snap > ms53: 0 4194304 multisnap-snap > ms85: 0 4194304 multisnap-snap > ms70: 0 4194304 multisnap-snap > ms9: 0 4194304 multisnap-snap > ms: 0 4194304 multisnapshot 28 103 524288 524281 46399 104 0 1 2 3 4 5 6 7 8 9 > 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 > 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 > 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 > 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 > ms18: 0 4194304 multisnap-snap > ms35: 0 4194304 multisnap-snap > ms20: 0 4194304 multisnap-snap > ms67: 0 4194304 multisnap-snap > ms52: 0 4194304 multisnap-snap > ms99: 0 4194304 multisnap-snap > ms84: 0 4194304 multisnap-snap > ms8: 0 4194304 multisnap-snap > ms17: 0 4194304 multisnap-snap > ms49: 0 4194304 multisnap-snap > ms34: 0 4194304 multisnap-snap > ms66: 0 4194304 multisnap-snap > ms51: 0 4194304 multisnap-snap > ms98: 0 4194304 multisnap-snap > ms83: 0 4194304 multisnap-snap > ms7: 0 4194304 multisnap-snap > ms16: 0 4194304 multisnap-snap > ms48: 0 4194304 multisnap-snap > ms33: 0 4194304 multisnap-snap > ms65: 0 4194304 multisnap-snap > ms50: 0 4194304 multisnap-snap > ms97: 0 4194304 multisnap-snap > ms82: 0 4194304 multisnap-snap > ms6: 0 4194304 multisnap-snap > ms15: 0 4194304 multisnap-snap > ms47: 0 4194304 multisnap-snap > ms32: 0 4194304 multisnap-snap > ms79: 0 4194304 multisnap-snap > ms64: 0 4194304 multisnap-snap > ms96: 0 4194304 multisnap-snap > ms81: 0 4194304 multisnap-snap > ms5: 0 4194304 multisnap-snap > ms29: 0 4194304 multisnap-snap > ms14: 0 4194304 multisnap-snap > ms46: 0 4194304 multisnap-snap > ms31: 0 4194304 multisnap-snap > ms78: 0 4194304 multisnap-snap > ms63: 0 4194304 multisnap-snap > ms95: 0 4194304 multisnap-snap > ms80: 0 4194304 multisnap-snap > ms4: 0 4194304 multisnap-snap > > #cat multisnap.sh > #!/bin/sh > help () > { > echo "$0 CMD OPT" > echo "CMD = INIT | SNAP" > echo "OPT = ORI_PATH, SNAP_PATH, CHUNK_SIZE, NAME | ORI_PATH, NAME, > SNAP_NUM" > } > > [ $# -lt 2 ] && help && exit > > CMD=$1 > > if [ $CMD = INIT ]; then > ORI=$2 > SNAP=$3 > CHUNK=$4 > NAME=$5 > > dd if=/dev/zero of=$SNAP bs=$CHUNK count=1 > sync > echo 0 `blockdev --getsize $ORI` multisnapshot $ORI $SNAP $CHUNK|dmsetup > create $NAME > mkfs.xfs -f /dev/mapper/$NAME > mkdir -p /mnt/$NAME > mount /dev/mapper/$NAME /mnt/$NAME > > elif [ $CMD = SNAP ]; then > ORI=$2 > NAME=$3 > CNT=$4 > SNAME=$NAME$CNT > > dmsetup message /dev/mapper/$NAME $CNT create > echo 0 `blockdev --getsize $ORI` multisnap-snap $ORI $CNT |dmsetup create > $SNAME > mkdir -p /mnt/$SNAME > mount -o nouuid,ro,norecovery /dev/mapper/$SNAME /mnt/$SNAME > else > help > fi > > #cat snap_c.sh > #!/bin/sh > CNT=0 > > while [ $CNT != 100 ] > do > cp -a /etc /mnt/ms/etc$CNT > ./multisnap.sh SNAP /dev/mapper/LD-ori ms $CNT > CNT=$[ $CNT + 1 ] > echo "`date` $CNT created" > done > > #sh snap_c.sh > Wed Nov 26 21:57:38 KST 2008 1 created > Wed Nov 26 21:57:38 KST 2008 2 created > Wed Nov 26 21:57:40 KST 2008 3 created > Wed Nov 26 21:57:43 KST 2008 4 created > Wed Nov 26 21:57:44 KST 2008 5 created > Wed Nov 26 21:57:45 KST 2008 6 created > Wed Nov 26 21:57:47 KST 2008 7 created > Wed Nov 26 21:57:48 KST 2008 8 created > Wed Nov 26 21:57:50 KST 2008 9 created > Wed Nov 26 21:57:51 KST 2008 10 created > Wed Nov 26 21:57:52 KST 2008 11 created > Wed Nov 26 21:57:54 KST 2008 12 created > Wed Nov 26 21:57:55 KST 2008 13 created > Wed Nov 26 21:57:55 KST 2008 14 created > Wed Nov 26 21:57:57 KST 2008 15 created > Wed Nov 26 21:57:58 KST 2008 16 created > Wed Nov 26 21:58:00 KST 2008 17 created > Wed Nov 26 21:58:01 KST 2008 18 created > Wed Nov 26 21:58:01 KST 2008 19 created > Wed Nov 26 21:58:03 KST 2008 20 created > Wed Nov 26 21:58:04 KST 2008 21 created > Wed Nov 26 21:58:05 KST 2008 22 created > Wed Nov 26 21:58:06 KST 2008 23 created > Wed Nov 26 21:58:08 KST 2008 24 created > Wed Nov 26 21:58:10 KST 2008 25 created > Wed Nov 26 21:58:10 KST 2008 26 created > Wed Nov 26 21:58:13 KST 2008 27 created > Wed Nov 26 21:58:13 KST 2008 28 created > Wed Nov 26 21:58:15 KST 2008 29 created > Wed Nov 26 21:58:17 KST 2008 30 created > Wed Nov 26 21:58:18 KST 2008 31 created > Wed Nov 26 21:58:19 KST 2008 32 created > Wed Nov 26 21:58:21 KST 2008 33 created > Wed Nov 26 21:58:22 KST 2008 34 created > Wed Nov 26 21:58:23 KST 2008 35 created > Wed Nov 26 21:58:25 KST 2008 36 created > Wed Nov 26 21:58:26 KST 2008 37 created > Wed Nov 26 21:58:28 KST 2008 38 created > Wed Nov 26 21:58:30 KST 2008 39 created > Wed Nov 26 21:58:31 KST 2008 40 created > Wed Nov 26 21:58:33 KST 2008 41 created > Wed Nov 26 21:58:34 KST 2008 42 created > Wed Nov 26 21:58:36 KST 2008 43 created > Wed Nov 26 21:58:37 KST 2008 44 created > Wed Nov 26 21:58:38 KST 2008 45 created > Wed Nov 26 21:58:40 KST 2008 46 created > Wed Nov 26 21:58:42 KST 2008 47 created > Wed Nov 26 21:58:42 KST 2008 48 created > Wed Nov 26 21:58:44 KST 2008 49 created > Wed Nov 26 21:58:45 KST 2008 50 created > Wed Nov 26 21:58:47 KST 2008 51 created > Wed Nov 26 21:58:48 KST 2008 52 created > Wed Nov 26 21:58:50 KST 2008 53 created > Wed Nov 26 21:58:51 KST 2008 54 created > Wed Nov 26 21:58:54 KST 2008 55 created > Wed Nov 26 21:58:54 KST 2008 56 created > Wed Nov 26 21:58:57 KST 2008 57 created > Wed Nov 26 21:58:58 KST 2008 58 created > Wed Nov 26 21:58:59 KST 2008 59 created > Wed Nov 26 21:59:02 KST 2008 60 created > Wed Nov 26 21:59:04 KST 2008 61 created > Wed Nov 26 21:59:05 KST 2008 62 created > Wed Nov 26 21:59:07 KST 2008 63 created > Wed Nov 26 21:59:09 KST 2008 64 created > Wed Nov 26 21:59:10 KST 2008 65 created > Wed Nov 26 21:59:12 KST 2008 66 created > Wed Nov 26 21:59:14 KST 2008 67 created > Wed Nov 26 21:59:15 KST 2008 68 created > Wed Nov 26 21:59:17 KST 2008 69 created > Wed Nov 26 21:59:19 KST 2008 70 created > Wed Nov 26 21:59:22 KST 2008 71 created > Wed Nov 26 21:59:23 KST 2008 72 created > Wed Nov 26 21:59:25 KST 2008 73 created > Wed Nov 26 21:59:26 KST 2008 74 created > Wed Nov 26 21:59:28 KST 2008 75 created > Wed Nov 26 21:59:30 KST 2008 76 created > Wed Nov 26 21:59:32 KST 2008 77 created > Wed Nov 26 21:59:34 KST 2008 78 created > Wed Nov 26 21:59:36 KST 2008 79 created > Wed Nov 26 21:59:37 KST 2008 80 created > Wed Nov 26 21:59:40 KST 2008 81 created > Wed Nov 26 21:59:42 KST 2008 82 created > Wed Nov 26 21:59:43 KST 2008 83 created > Wed Nov 26 21:59:46 KST 2008 84 created > Wed Nov 26 21:59:48 KST 2008 85 created > Wed Nov 26 21:59:49 KST 2008 86 created > Wed Nov 26 21:59:51 KST 2008 87 created > Wed Nov 26 21:59:52 KST 2008 88 created > Wed Nov 26 21:59:55 KST 2008 89 created > Wed Nov 26 21:59:57 KST 2008 90 created > Wed Nov 26 21:59:58 KST 2008 91 created > Wed Nov 26 22:00:01 KST 2008 92 created > Wed Nov 26 22:00:04 KST 2008 93 created > Wed Nov 26 22:00:04 KST 2008 94 created > Wed Nov 26 22:00:07 KST 2008 95 created > Wed Nov 26 22:00:09 KST 2008 96 created > Wed Nov 26 22:00:10 KST 2008 97 created > cp: cannot create directory `/mnt/ms/etc97/doc': Input/output error > cp: cannot create directory `/mnt/ms/etc97/cron.weekly': Input/output error > cp: cannot create directory `/mnt/ms/etc97/snmp': Input/output error > cp: cannot create directory `/mnt/ms/etc97/logrotate.d': Input/output error > cp: cannot create regular file `/mnt/ms/etc97/pwdb.conf': Input/output error > cp: cannot create regular file `/mnt/ms/etc97/rsyncd.conf': Input/output error > <...snip...> > cp: cannot create regular file `/mnt/ms/etc97/passwd': Input/output error > cp: cannot create symbolic link `/mnt/ms/etc97/my.cnf': Input/output error > cp: cannot create directory `/mnt/ms/etc97/ssl': Input/output error > cp: cannot create regular file `/mnt/ms/etc97/ftpusers': Input/output error > cp: cannot create regular file `/mnt/ms/etc97/mtab': Input/output error > cp: cannot create directory `/mnt/ms/etc97/security': Input/output error > cp: cannot create regular file `/mnt/ms/etc97/slp.reg': Input/output error > cp: cannot create regular file `/mnt/ms/etc97/group-': Input/output error > cp: cannot create regular file `/mnt/ms/etc97/blkid.tab': Input/output error > cp: cannot create regular file `/mnt/ms/etc97/.pwd.lock': Input/output error > cp: cannot create regular file `/mnt/ms/etc97/blkid.tab.old': Input/output > error > cp: cannot create regular file `/mnt/ms/etc97/passwd.bak': Input/output error > cp: preserving times for `/mnt/ms/etc97': Input/output error > device-mapper: message ioctl failed: No space left on device > Command failed > mount: you must specify the filesystem type > Wed Nov 26 22:00:11 KST 2008 98 created > cp: accessing `/mnt/ms/etc98': Input/output error > device-mapper: message ioctl failed: No space left on device > Command failed > mount: you must specify the filesystem type > Wed Nov 26 22:00:11 KST 2008 99 created > cp: accessing `/mnt/ms/etc99': Input/output error > device-mapper: message ioctl failed: No space left on device > Command failed > mount: you must specify the filesystem type > Wed Nov 26 22:00:11 KST 2008 100 created > > > Mikulas Patocka wrote: > > Hi > > > > I fixed the ext2 bug (it was unsupported handling of buffer readahead) --- > > download the new version of patches from the same location. > > > > I couldn't reproduce the XFS bug. Please retry. Are you sure that you didn't > > try to mount the _snapshot_ as XFS? Snapshots are currently not writeable > > (they will be writeable in the final version), so attempting to mount the > > snapshot read/write would return i/o error to the filesystem and produce an > > error message similar to the one displayed. > > > > Thanks for testing it. > > > > Mikulas > > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Announce: unlimited number of shared snapshots @ 2008-11-27 5:41 Mikulas Patocka 0 siblings, 0 replies; 5+ messages in thread From: Mikulas Patocka @ 2008-11-27 5:41 UTC (permalink / raw) To: dm-devel; +Cc: Alasdair G Kergon Hi I made first release of my snapshot storage that can hold unlimited number of snapshots and share data between them: http://people.redhat.com/mpatocka/patches/kernel/new-snapshots/ How-to-use is at the beginning of dm-multisnapshot.patch If you see some errors, report them. This storage uses btree with the key (chunk number, snapshot range). It uses log-structured storage, so that it is safe w.r.t. crash. TODO: - reclaim allocated space, allow deleting snapshots - writable snapshots Mikulas ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2008-12-04 3:27 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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[not found] <492FAF1C.8080401@gluesys.com>
2008-11-28 19:54 ` Re:Announce: unlimited number of shared snapshots Mikulas Patocka
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2008-12-02 7:05 ` Announce: " Mikulas Patocka
2008-12-02 7:34 ` Christoph Hellwig
[not found] ` <4936187D.1000302@gluesys.com>
2008-12-04 3:27 ` Mikulas Patocka
2008-11-27 5:41 Mikulas Patocka
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