[linux-lvm] Invalid new snapshot

[linux-lvm] Invalid new snapshot

[Lee Rocky]

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Dear All

when I try to create multi snapshot volumes, sometimes the new snapshot
volume will be marked Invalid after created, somtimes remove then recreate
without problem.

is it hard disk problem?

dmesg error
attempt to access beyond end of device
dm-9: rw=17, want=2271285024, limit=8257536
device-mapper: Error reading/writing snapshot
device-mapper: snapshot is marked invalid
printk: 1 messages suppressed.
Buffer I/O error on device dm-10, logical block 0
Buffer I/O error on device dm-10, logical block 1
Buffer I/O error on device dm-10, logical block 2
Buffer I/O error on device dm-10, logical block 3
Buffer I/O error on device dm-10, logical block 4
Buffer I/O error on device dm-10, logical block 5
Buffer I/O error on device dm-10, logical block 6
Buffer I/O error on device dm-10, logical block 7
Buffer I/O error on device dm-10, logical block 0
Buffer I/O error on device dm-10, logical block 8
FAT: Unrecognized mount option "nouuid" or missing value

lvscan
  /dev/VG01/test1: read failed after 0 of 4096 at 0: Input/output error

best regards
Rocky

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Re: [linux-lvm] Invalid new snapshot

[Alasdair G Kergon]

On Wed, Dec 14, 2005 at 11:37:22AM +0800, Lee Rocky wrote:
> when I try to create multi snapshot volumes, sometimes the new snapshot
> volume will be marked Invalid after created, somtimes remove then recreate
> without problem.
 
> dmesg error
> attempt to access beyond end of device
> dm-9: rw=17, want=2271285024, limit=8257536
> device-mapper: Error reading/writing snapshot
> device-mapper: snapshot is marked invalid

What kernel?
What software version?
  (e.g. output of 'lvm version')

What lvcreate -s command parameters? (After how many existing snapshots?)
What configuration of original LV?
  ('lvs --segments -v')

Any I/O happening to any of the devices involved at around the same time?

Alasdair
-- 
agk@redhat.com

Re: [linux-lvm] Invalid new snapshot

[Lee Rocky]

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Kernel =>  2.6.13 (dm-snapshot-bio_list-fix.patch patched)

lvm version =>
  LVM version:     2.02.01 (2005-11-23)
  Library version: 1.02.02 (2005-12-02)
  Driver version:  4.4.0

-bash-3.00# lvcreate -s -L3000 -n test2_1 /dev/VG01/test2
  Rounding up size to full physical extent 2.94 GB
  Logical volume "test2_1" created
-bash-3.00# lvcreate -s -L 3000 -n test2_2 /dev/VG01/test2
  Rounding up size to full physical extent 2.94 GB
  Logical volume "test2_2" created
-bash-3.00# lvcreate -s -L 3000 -n test2_3 /dev/VG01/test2
  Rounding up size to full physical extent 2.94 GB
  Logical volume "test2_3" created


lvs --segment -v
----------------------------------------------------------
    Finding all logical volumes
  /dev/VG01/test2_3: read failed after 0 of 4096 at 0: Input/output error
  LV      VG                       Attr   Start SSize   #Str Type   Stripe
Chunk
  lv1      VG01 -wi-ao    0  256.00M    1 linear     0     0
  lv2      VG01 -wi-ao    0    1.00G    1 linear     0     0
  lv3      VG01 -wi-a-    0   64.00M    1 linear     0     0
  lv4      VG01 -wi-ao    0  512.00M    1 linear     0     0
  lv5      VG01 -wi-ao    0  128.00M    1 linear     0     0
  test2   VG01owi-ao    0   29.31G    1 linear     0     0
  test2_1 VG01 swi-a-    0    2.94G    1 linear     0  8.00K
  test2_2 VG01 swi-a-    0    2.94G    1 linear     0  8.00K
  test2_3 VG01 Swi-I-    0    2.94G    1 linear     0  8.00K


-bash-3.00# lvs -a
  /dev/VG01/test2_3: read failed after 0 of 4096 at 0: Inpu/output error
  LV      VG      Attr   LSize   Origin Snap%  Move Log Copy%
  lv1       VG01  -wi-ao 256.00M
  lv2       VG01  -wi-ao   1.00G
  lv3       VG01  -wi-a-  64.00M
  lv4       VG01  -wi-ao 512.00M
  lv5       VG01  -wi-ao 128.00M
  test2   VG01 owi-ao  29.31G
  test2_1 VG01 swi-a-   2.94G test2   30.00
  test2_2 VG01 swi-a-   2.94G test2   29.99
  test2_3 VG01 Swi-I-   2.94G test2  100.00

 lvscan
----------------------------------------------------------
  /dev/VG01/test2_3: read failed after 0 of 4096 at 0: Input/output error
  ACTIVE                '/dev/VG01/lv1' [256.00 MB] inherit
  ACTIVE                '/dev/VG01/lv2' [1.00 GB] inherit
  ACTIVE                '/dev/VG01/lv3' [64.00 MB] inherit
  ACTIVE                '/dev/VG01/lv4' [512.00 MB] inherit
  ACTIVE                '/dev/VG01lv5' [128.00 MB] inherit
  ACTIVE   Original '/dev/VG01/test2' [29.31 GB] inherit
  ACTIVE   Snapshot '/dev/VG01/test2_1' [2.94 GB] inherit
  ACTIVE   Snapshot '/dev/VG01/test2_2' [2.94 GB] inherit
  ACTIVE   Snapshot '/dev/VG01/test2_3' [2.94 GB] inherit

dmesg after created
----------------------------------------------------------
attempt to access beyond end of device
dm-11: rw=17, want=2271285024, limit=6160384
device-mapper: Error reading/writing snapshot
device-mapper: snapshot is marked invalid

dmesg after tried to mount
----------------------------------------------------------
printk: 1 messages suppressed.
Buffer I/O error on device dm-12, logical block 0
Buffer I/O error on device dm-12, logical block 1
Buffer I/O error on device dm-12, logical block 2
Buffer I/O error on device dm-12, logical block 3
Buffer I/O error on device dm-12, logical block 4
Buffer I/O error on device dm-12, logical block 5
Buffer I/O error on device dm-12, logical block 6
Buffer I/O error on device dm-12, logical block 7
Buffer I/O error on device dm-12, logical block 0
Buffer I/O error on device dm-12, logical block 8
FAT: Unrecognized mount option "nouuid" or missing value


I create snapshot while test2 is busy. (I/O origin volume)
but even I stopped writing data (already got error), sometime it still
happen. 1 out of 3
-bash-3.00# lvs -a
  /dev/VG01/test2_4: read failed after 0 of 4096 at 0: Input/output error
  /dev/VG01/test2_7: read failed after 0 of 4096 at 0: Input/output error
  /dev/VG01/test2_10: read failed after 0 of 4096 at 0: Input/output error
  lv1        VG01 -wi-ao 256.00M
  lv2        VG01 -wi-ao   1.00G
  lv3        VG01 -wi-a-  64.00M
  lv4        VG01 -wi-ao 512.00M
  lv5        VG01 -wi-ao 128.00M
  test2     VG01 owi-ao  29.31G
  test2_1  VG01 swi-a-   2.94G test2   38.28
  test2_10 VG01 Swi-I-   2.94G test2  100.00
  test2_2  VG01 swi-a-   2.94G test2   38.27
  test2_3  VG01 swi-a-   2.94G test2    0.01
  test2_4  VG01 Swi-I-   2.94G test2  100.00
  test2_5  VG01 swi-a-   2.94G test2    0.00
  test2_6  VG01 swi-a-   2.94G test2    0.00
  test2_7  VG01 Swi-I-   2.94G test2  100.00
  test2_8  VG01 swi-a-   2.94G test2    0.00
  test2_9  VG01 swi-a-   2.94G test2    0.00

Rocky

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Re: [linux-lvm] Invalid new snapshot

[Lee Rocky]

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if volume with jounal file system (xfs,ext3) is mounted  (no I/O)
the invalid error sometime happens when create snapshot. (sometimes but easy
to reproduce)

create snapshot has no invalid error if volume is not mounted.


hope this information helps.

Rocky

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