[linux-lvm] how to swap a bad drive on a non-standard mirror

[Scott Merrilees]

Looks like a dmraid setup.  Googling Linux isw found me a rebuild guide.
On 06/11/2012 9:05 AM, "Randy Schultz" <schulra at earlham.edu> wrote:

> Hey all,
>
> I have a system that somebody set up, reportedly during the RHEL install,
> to have the 2 on-board drives
> mirrored.  We lost the second drive.  I know how to do deal with this on a
> standard setup with 2 PV's, but it
> looks like there is only 1 PV and I cannot find any documentation on how
> to deal with this.
>
> The system has 2 drives partitioned this way:
>      ? fdisk -l
>
>      Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
>      255 heads, 63 sectors/track, 121601 cylinders
>      Units = cylinders of 16065 * 512 = 8225280 bytes
>
>         Device Boot      Start         End      Blocks   Id  System
>      /dev/sda1   *           1          13      104391   83  Linux
>      /dev/sda2              14      121600   976647577+  8e  Linux LVM
>
>      Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
>      255 heads, 63 sectors/track, 121601 cylinders
>      Units = cylinders of 16065 * 512 = 8225280 bytes
>
>         Device Boot      Start         End      Blocks   Id  System
>      /dev/sdb1   *           1          13      104391   83  Linux
>      /dev/sdb2              14      121600   976647577+  8e  Linux LVM
>
>
> The fstab mounts things as:
>      ? cat /etc/fstab
>      /dev/VolGroup00/LogVol00 /                       ext3    defaults
>    1 1
>      /dev/VolGroup00/LogVol02 /var                    ext3    defaults
>    1 2
>      /dev/VolGroup00/LogVol03 /opt                    ext3    defaults
>    1 2
>      LABEL=/boot             /boot                   ext3    defaults
>    1 2
>      tmpfs                   /dev/shm                tmpfs   defaults
>    0 0
>      devpts                  /dev/pts                devpts
>  gid=5,mode=620  0 0
>      sysfs                   /sys                    sysfs   defaults
>    0 0
>      proc                    /proc                   proc    defaults
>    0 0
>      /dev/VolGroup00/LogVol01 swap                    swap    defaults
>    0 0
>
>
> giving these mountpoints:
>      ? df -h
>      Filesystem            Size  Used Avail Use% Mounted on
>      /dev/mapper/VolGroup00-**LogVol00
>                             24G  9.1G   14G  41% /
>      /dev/mapper/VolGroup00-**LogVol02
>                             24G  555M   22G   3% /var
>      /dev/mapper/VolGroup00-**LogVol03
>                            770G   45G  686G   7% /opt
>      /dev/mapper/isw_ccebcbejfi_**Volume0p1
>                             99M   26M   69M  28% /boot
>      tmpfs                  14G     0   14G   0% /dev/shm
>
> There are no md devices:
>      ? cat /proc/mdstat
>      Personalities :
>      unused devices: <none>
>
>
> DMsetup shows:
>      ? dmsetup status
>      isw_ccebcbejfi_Volume0p2: 0 1953295155 linear
>      isw_ccebcbejfi_Volume0p1: 0 208782 linear
>      VolGroup00-LogVol03: 0 1666580480 linear
>      VolGroup00-LogVol02: 0 51183616 linear
>      VolGroup00-LogVol01: 0 184287232 linear
>      VolGroup00-LogVol00: 0 51183616 linear
>      isw_ccebcbejfi_Volume0: 0 1953519352 mirror 2 8:0 8:16 14905/14905 1
> AR 1 core
>
>
> Here's where things get weird.  Pvscan shows only 1 device:
>      ? pvscan -v
>          Wiping cache of LVM-capable devices
>          Wiping internal VG cache
>          Walking through all physical volumes
>        PV /dev/mapper/isw_ccebcbejfi_**Volume0p2   VG VolGroup00   lvm2
> [931.38 GB / 0    free]
>        Total: 1 [931.38 GB] / in use: 1 [931.38 GB] / in no VG: 0 [0   ]
>
>
> So, if I understand this correctly, sda2 and sdb2 were tied together
> somehow as a mirror, then this was
> presented to lvm as the PV.  Cool, but how do I swap out sdb?!
>
> --
>  Randy    (schulra at earlham.edu)      765.983.1283         <*>
>
> nosce te ipsum
>
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-**HOWTO/<http://tldp.org/HOWTO/LVM-HOWTO/>
>
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