Looks like a dmraid setup. Googling Linux isw found me a rebuild guide.
On 06/11/2012 9:05 AM, "Randy Schultz" <schulra@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@earlham.edu) 765.983.1283 <*>
nosce te ipsum
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