* [linux-lvm] how to access the partition on LV?
@ 2005-07-28 15:17 Ming Zhang
2005-07-28 16:45 ` AJ Lewis
0 siblings, 1 reply; 9+ messages in thread
From: Ming Zhang @ 2005-07-28 15:17 UTC (permalink / raw)
To: LVM
I think this is a very common question but i can not find the answer.
any idea on how to access the partition on these lv since no device
node?
[root@fc3-i386-2 ~]# fdisk /dev/vg1/v1 -l
Disk /dev/vg1/v1: 469 MB, 469762048 bytes
255 heads, 63 sectors/track, 57 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/vg1/v1p1 1 13 104391 83 Linux
/dev/vg1/v1p2 14 57 353430 83 Linux
Thanks!
Ming
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: [linux-lvm] how to access the partition on LV? 2005-07-28 15:17 [linux-lvm] how to access the partition on LV? Ming Zhang @ 2005-07-28 16:45 ` AJ Lewis 2005-07-28 17:13 ` Ming Zhang 0 siblings, 1 reply; 9+ messages in thread From: AJ Lewis @ 2005-07-28 16:45 UTC (permalink / raw) To: mingz, LVM general discussion and development [-- Attachment #1: Type: text/plain, Size: 1370 bytes --] On Thu, Jul 28, 2005 at 11:17:41AM -0400, Ming Zhang wrote: > I think this is a very common question but i can not find the answer. > any idea on how to access the partition on these lv since no device > node? > > > [root@fc3-i386-2 ~]# fdisk /dev/vg1/v1 -l > > Disk /dev/vg1/v1: 469 MB, 469762048 bytes > 255 heads, 63 sectors/track, 57 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > > Device Boot Start End Blocks Id System > /dev/vg1/v1p1 1 13 104391 83 Linux > /dev/vg1/v1p2 14 57 353430 83 Linux You don't. Don't put partition tables on LVs. The whole point of using LVM is you don't need to partition anymore, and your block devices can be dynamic. If you another block devices, you lvcreate it. If you don't have enough space in your VG, you add a PV to it, then lvcreate the new block device. Have you read through the HOWTO referenced below? -- AJ Lewis Voice: 612-638-0500 Red Hat E-Mail: alewis@redhat.com One Main Street SE, Suite 209 Minneapolis, MN 55414 Current GPG fingerprint = D9F8 EDCE 4242 855F A03D 9B63 F50C 54A8 578C 8715 Grab the key at: http://people.redhat.com/alewis/gpg.html or one of the many keyservers out there... [-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --] ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [linux-lvm] how to access the partition on LV? 2005-07-28 16:45 ` AJ Lewis @ 2005-07-28 17:13 ` Ming Zhang 2005-07-28 17:32 ` AJ Lewis 0 siblings, 1 reply; 9+ messages in thread From: Ming Zhang @ 2005-07-28 17:13 UTC (permalink / raw) To: AJ Lewis; +Cc: LVM general discussion and development On Thu, 2005-07-28 at 11:45 -0500, AJ Lewis wrote: > On Thu, Jul 28, 2005 at 11:17:41AM -0400, Ming Zhang wrote: > > I think this is a very common question but i can not find the answer. > > any idea on how to access the partition on these lv since no device > > node? > > > > > > [root@fc3-i386-2 ~]# fdisk /dev/vg1/v1 -l > > > > Disk /dev/vg1/v1: 469 MB, 469762048 bytes > > 255 heads, 63 sectors/track, 57 cylinders > > Units = cylinders of 16065 * 512 = 8225280 bytes > > > > Device Boot Start End Blocks Id System > > /dev/vg1/v1p1 1 13 104391 83 Linux > > /dev/vg1/v1p2 14 57 353430 83 Linux > the problem is that we export a LV via iscsi to a remote box and become a scsi disk. so it is partitioned and utilized. then it does have partition on it. even it is exported to a linux box, u possibly will use /dev/sdx1 instead of directly use /dev/sdx, rite? > You don't. Don't put partition tables on LVs. The whole point of using LVM > is you don't need to partition anymore, and your block devices can be dynamic. > If you another block devices, you lvcreate it. If you don't have enough space > in your VG, you add a PV to it, then lvcreate the new block device. Have you > read through the HOWTO referenced below? i can not see this HOWTO, where u referenced it? thx! ming > ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [linux-lvm] how to access the partition on LV? 2005-07-28 17:13 ` Ming Zhang @ 2005-07-28 17:32 ` AJ Lewis 2005-07-28 17:42 ` Ming Zhang 2005-07-29 20:56 ` Alasdair G Kergon 0 siblings, 2 replies; 9+ messages in thread From: AJ Lewis @ 2005-07-28 17:32 UTC (permalink / raw) To: Ming Zhang; +Cc: LVM general discussion and development [-- Attachment #1: Type: text/plain, Size: 2380 bytes --] On Thu, Jul 28, 2005 at 01:13:50PM -0400, Ming Zhang wrote: > On Thu, 2005-07-28 at 11:45 -0500, AJ Lewis wrote: > > On Thu, Jul 28, 2005 at 11:17:41AM -0400, Ming Zhang wrote: > > > I think this is a very common question but i can not find the answer. > > > any idea on how to access the partition on these lv since no device > > > node? > > > > > > > > > [root@fc3-i386-2 ~]# fdisk /dev/vg1/v1 -l > > > > > > Disk /dev/vg1/v1: 469 MB, 469762048 bytes > > > 255 heads, 63 sectors/track, 57 cylinders > > > Units = cylinders of 16065 * 512 = 8225280 bytes > > > > > > Device Boot Start End Blocks Id System > > > /dev/vg1/v1p1 1 13 104391 83 Linux > > > /dev/vg1/v1p2 14 57 353430 83 Linux > > > > the problem is that we export a LV via iscsi to a remote box and become > a scsi disk. so it is partitioned and utilized. then it does have > partition on it. even it is exported to a linux box, u possibly will > use /dev/sdx1 instead of directly use /dev/sdx, rite? Ahh - I see. Well, on the node exporting the LVs, you don't access it. I dunno if kpartx or some other partitioning tool could do it - it might. But as far as the standard partion handling code goes, LVs don't exist. I know why you're doing it this way - I don't know why you want to access the partitions on the exporting (target) node. Do you really need to? > > You don't. Don't put partition tables on LVs. The whole point of using > > LVM is you don't need to partition anymore, and your block devices can be > > dynamic. If you another block devices, you lvcreate it. If you don't > > have enough space in your VG, you add a PV to it, then lvcreate the new > > block device. Have you read through the HOWTO referenced below? > > i can not see this HOWTO, where u referenced it? It's at the bottom of all messages that go to the linux-lvm ML - http://tldp.org/HOWTO/LVM-HOWTO/ -- AJ Lewis Voice: 612-638-0500 Red Hat E-Mail: alewis@redhat.com One Main Street SE, Suite 209 Minneapolis, MN 55414 Current GPG fingerprint = D9F8 EDCE 4242 855F A03D 9B63 F50C 54A8 578C 8715 Grab the key at: http://people.redhat.com/alewis/gpg.html or one of the many keyservers out there... [-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --] ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [linux-lvm] how to access the partition on LV? 2005-07-28 17:32 ` AJ Lewis @ 2005-07-28 17:42 ` Ming Zhang 2005-07-28 18:03 ` AJ Lewis 2005-07-29 20:56 ` Alasdair G Kergon 1 sibling, 1 reply; 9+ messages in thread From: Ming Zhang @ 2005-07-28 17:42 UTC (permalink / raw) To: AJ Lewis; +Cc: LVM general discussion and development On Thu, 2005-07-28 at 12:32 -0500, AJ Lewis wrote: > On Thu, Jul 28, 2005 at 01:13:50PM -0400, Ming Zhang wrote: > > On Thu, 2005-07-28 at 11:45 -0500, AJ Lewis wrote: > > > On Thu, Jul 28, 2005 at 11:17:41AM -0400, Ming Zhang wrote: > > > > I think this is a very common question but i can not find the answer. > > > > any idea on how to access the partition on these lv since no device > > > > node? > > > > > > > > > > > > [root@fc3-i386-2 ~]# fdisk /dev/vg1/v1 -l > > > > > > > > Disk /dev/vg1/v1: 469 MB, 469762048 bytes > > > > 255 heads, 63 sectors/track, 57 cylinders > > > > Units = cylinders of 16065 * 512 = 8225280 bytes > > > > > > > > Device Boot Start End Blocks Id System > > > > /dev/vg1/v1p1 1 13 104391 83 Linux > > > > /dev/vg1/v1p2 14 57 353430 83 Linux > > > > > > > the problem is that we export a LV via iscsi to a remote box and become > > a scsi disk. so it is partitioned and utilized. then it does have > > partition on it. even it is exported to a linux box, u possibly will > > use /dev/sdx1 instead of directly use /dev/sdx, rite? > > Ahh - I see. Well, on the node exporting the LVs, you don't access it. I > dunno if kpartx or some other partitioning tool could do it - it might. But > as far as the standard partion handling code goes, LVs don't exist. I know > why you're doing it this way - I don't know why you want to access the > partitions on the exporting (target) node. Do you really need to? yes, i guess that is the only solution. we have end users want that feature. so i think a work around is to run a iscsi initiator at local site and access via iscsi again. > > > > You don't. Don't put partition tables on LVs. The whole point of using > > > LVM is you don't need to partition anymore, and your block devices can be > > > dynamic. If you another block devices, you lvcreate it. If you don't > > > have enough space in your VG, you add a PV to it, then lvcreate the new > > > block device. Have you read through the HOWTO referenced below? > > > > i can not see this HOWTO, where u referenced it? > > It's at the bottom of all messages that go to the linux-lvm ML - > http://tldp.org/HOWTO/LVM-HOWTO/ i guess this is because i got the email from u directly. so lvm list will not send to me again. and only email via it will have that link. i checked my archival and all emails via lvm list has that. ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [linux-lvm] how to access the partition on LV? 2005-07-28 17:42 ` Ming Zhang @ 2005-07-28 18:03 ` AJ Lewis 2005-07-28 18:14 ` Ming Zhang 0 siblings, 1 reply; 9+ messages in thread From: AJ Lewis @ 2005-07-28 18:03 UTC (permalink / raw) To: Ming Zhang; +Cc: LVM general discussion and development [-- Attachment #1: Type: text/plain, Size: 1963 bytes --] On Thu, Jul 28, 2005 at 01:42:10PM -0400, Ming Zhang wrote: > On Thu, 2005-07-28 at 12:32 -0500, AJ Lewis wrote: > > On Thu, Jul 28, 2005 at 01:13:50PM -0400, Ming Zhang wrote: > > > the problem is that we export a LV via iscsi to a remote box and become > > > a scsi disk. so it is partitioned and utilized. then it does have > > > partition on it. even it is exported to a linux box, u possibly will > > > use /dev/sdx1 instead of directly use /dev/sdx, rite? > > > > Ahh - I see. Well, on the node exporting the LVs, you don't access it. I > > dunno if kpartx or some other partitioning tool could do it - it might. But > > as far as the standard partion handling code goes, LVs don't exist. I know > > why you're doing it this way - I don't know why you want to access the > > partitions on the exporting (target) node. Do you really need to? > yes, i guess that is the only solution. we have end users want that > feature. so i think a work around is to run a iscsi initiator at local > site and access via iscsi again. Could play with loopback devices too if you need to do it on the target - that might get nasty quickly though. > > > i can not see this HOWTO, where u referenced it? > > > > It's at the bottom of all messages that go to the linux-lvm ML - > > http://tldp.org/HOWTO/LVM-HOWTO/ > > i guess this is because i got the email from u directly. so lvm list > will not send to me again. and only email via it will have that link. i > checked my archival and all emails via lvm list has that. Heh - yep, that'd do it ;) -- AJ Lewis Voice: 612-638-0500 Red Hat E-Mail: alewis@redhat.com One Main Street SE, Suite 209 Minneapolis, MN 55414 Current GPG fingerprint = D9F8 EDCE 4242 855F A03D 9B63 F50C 54A8 578C 8715 Grab the key at: http://people.redhat.com/alewis/gpg.html or one of the many keyservers out there... [-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --] ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [linux-lvm] how to access the partition on LV? 2005-07-28 18:03 ` AJ Lewis @ 2005-07-28 18:14 ` Ming Zhang 0 siblings, 0 replies; 9+ messages in thread From: Ming Zhang @ 2005-07-28 18:14 UTC (permalink / raw) To: LVM general discussion and development On Thu, 2005-07-28 at 13:03 -0500, AJ Lewis wrote: > On Thu, Jul 28, 2005 at 01:42:10PM -0400, Ming Zhang wrote: > > On Thu, 2005-07-28 at 12:32 -0500, AJ Lewis wrote: > > > On Thu, Jul 28, 2005 at 01:13:50PM -0400, Ming Zhang wrote: > > > > the problem is that we export a LV via iscsi to a remote box and become > > > > a scsi disk. so it is partitioned and utilized. then it does have > > > > partition on it. even it is exported to a linux box, u possibly will > > > > use /dev/sdx1 instead of directly use /dev/sdx, rite? > > > > > > Ahh - I see. Well, on the node exporting the LVs, you don't access it. I > > > dunno if kpartx or some other partitioning tool could do it - it might. But > > > as far as the standard partion handling code goes, LVs don't exist. I know > > > why you're doing it this way - I don't know why you want to access the > > > partitions on the exporting (target) node. Do you really need to? > > yes, i guess that is the only solution. we have end users want that > > feature. so i think a work around is to run a iscsi initiator at local > > site and access via iscsi again. > > Could play with loopback devices too if you need to do it on the target - that > might get nasty quickly though. can loopback support partition? might worthy a try. :P > > > > > i can not see this HOWTO, where u referenced it? > > > > > > It's at the bottom of all messages that go to the linux-lvm ML - > > > http://tldp.org/HOWTO/LVM-HOWTO/ > > > > i guess this is because i got the email from u directly. so lvm list > > will not send to me again. and only email via it will have that link. i > > checked my archival and all emails via lvm list has that. > > Heh - yep, that'd do it ;) > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ this time works. :P ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [linux-lvm] how to access the partition on LV? 2005-07-28 17:32 ` AJ Lewis 2005-07-28 17:42 ` Ming Zhang @ 2005-07-29 20:56 ` Alasdair G Kergon 2005-07-29 21:14 ` Ming Zhang 1 sibling, 1 reply; 9+ messages in thread From: Alasdair G Kergon @ 2005-07-29 20:56 UTC (permalink / raw) To: LVM general discussion and development > > the problem is that we export a LV via iscsi to a remote box and become > > a scsi disk. so it is partitioned and utilized. then it does have > > partition on it. even it is exported to a linux box, u possibly will > > use /dev/sdx1 instead of directly use /dev/sdx, rite? > dunno if kpartx or some other partitioning tool could do it Give kpartx a try. It reads a dos partition table and creates partitions using device-mapper. You'll find kpartx in multipath-tools (device-mapper-multipath package on Red Hat). ftp://sources.redhat.com/pub/dm/multipath-tools/multipath-tools-0.4.5.48.tgz Alasdair -- agk@redhat.com ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [linux-lvm] how to access the partition on LV? 2005-07-29 20:56 ` Alasdair G Kergon @ 2005-07-29 21:14 ` Ming Zhang 0 siblings, 0 replies; 9+ messages in thread From: Ming Zhang @ 2005-07-29 21:14 UTC (permalink / raw) To: LVM general discussion and development thx. ming On Fri, 2005-07-29 at 21:56 +0100, Alasdair G Kergon wrote: > > > the problem is that we export a LV via iscsi to a remote box and become > > > a scsi disk. so it is partitioned and utilized. then it does have > > > partition on it. even it is exported to a linux box, u possibly will > > > use /dev/sdx1 instead of directly use /dev/sdx, rite? > > > dunno if kpartx or some other partitioning tool could do it > > Give kpartx a try. It reads a dos partition table and creates partitions > using device-mapper. > > You'll find kpartx in multipath-tools (device-mapper-multipath package on Red Hat). > ftp://sources.redhat.com/pub/dm/multipath-tools/multipath-tools-0.4.5.48.tgz > > Alasdair ^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2005-07-29 21:14 UTC | newest] Thread overview: 9+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2005-07-28 15:17 [linux-lvm] how to access the partition on LV? Ming Zhang 2005-07-28 16:45 ` AJ Lewis 2005-07-28 17:13 ` Ming Zhang 2005-07-28 17:32 ` AJ Lewis 2005-07-28 17:42 ` Ming Zhang 2005-07-28 18:03 ` AJ Lewis 2005-07-28 18:14 ` Ming Zhang 2005-07-29 20:56 ` Alasdair G Kergon 2005-07-29 21:14 ` Ming Zhang
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