[TriLUG] LVM question on Ubuntu

[William Sutton]

on a more serious note, what happens when you

vgchange -a y

?

William Sutton

On Fri, 30 Sep 2011, Jeffery Painter wrote:

> Hello Triluggers,
>
> I need some help from those more experienced with LVM management than
> myself, or at least point me to the right terms to google.
>
> I just upgraded my Ubuntu box from 9.04 all the way up to 11.10.
> Everything went fine until the last reboot.
>
> /etc/fstab had an entry for...
> /dev/backups/share     /backups        ext3    rw,noatime      0       0
>
> however, /dev/backups/share has disappeared as a device. How do I
> recreate it without destroying the data on the LVM itself?
>
> I can still see the volume group:
> root at stgdb:~# vgdisplay
> File descriptor 3 (pipe:[10728]) leaked on vgdisplay invocation.
> Parent PID 2164: -su
>  --- Volume group ---
>  VG Name               backups
>  System ID
>  Format                lvm2
>  Metadata Areas        3
>  Metadata Sequence No  4
>  VG Access             read/write
>  VG Status             resizable
>  MAX LV                0
>  Cur LV                1
>  Open LV               0
>  Max PV                0
>  Cur PV                3
>  Act PV                3
>  VG Size               1.41 TiB
>  PE Size               4.00 MiB
>  Total PE              369624
>  Alloc PE / Size       307200 / 1.17 TiB
>  Free  PE / Size       62424 / 243.84 GiB
>  VG UUID               OG1HUA-t86u-rBoc-0iK3-3Kmi-mtCZ-E1mN7S
>
>
> and lvscan reports:
>
> root at stgdb:~# lvscan
> File descriptor 3 (pipe:[10728]) leaked on lvscan invocation. Parent
> PID 2164: -su
>  ACTIVE            '/dev/backups/share' [1.17 TiB] inherit
>
>
> The physical layout of the LVM was created from:
> /dev/sdb1
> /dev/sdc1
> /dev/sdd1
>
> The drives seem to be fully functional.. fdisk reports that all the
> partitions are still there and of type LVM
>
> dmesg says...
>
> [    3.597896]  sdb: sdb1
> [    3.598367] sd 1:0:0:0: [sdb] Attached SCSI disk
> [    4.073100] sd 2:0:0:0: Attached scsi generic sg2 type 0
> [    4.073614] sd 2:0:0:0: [sdc] 781422768 512-byte logical blocks:
> (400 GB/372 GiB)
> [    4.073707] sd 2:0:0:0: [sdc] Write Protect is off
> [    4.073712] sd 2:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> [    4.073749] sd 2:0:0:0: [sdc] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [    4.091543]  sdc: sdc1
> [    4.091977] sd 2:0:0:0: [sdc] Attached SCSI disk
> [    4.589078] sd 3:0:0:0: Attached scsi generic sg3 type 0
> [    4.589343] sd 3:0:0:0: [sdd] 781422768 512-byte logical blocks:
> (400 GB/372 GiB)
> [    4.589437] sd 3:0:0:0: [sdd] Write Protect is off
> [    4.589442] sd 3:0:0:0: [sdd] Mode Sense: 00 3a 00 00
> [    4.589481] sd 3:0:0:0: [sdd] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [    4.601957]  sdd: sdd1
> [    4.602404] sd 3:0:0:0: [sdd] Attached SCSI disk
>
>
> I could recreate from scratch if I had to, but I'd rather not have to
> copy all the data back over if I can help it.
> That would take several hours of moving data over the network :-(
>
> Thanks,
> Jeff Painter
> --
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