[CentOS] Re: lvm errors after replacing drive in raid 10 array [SOLVED ?]

2008-07-18 Thread Mike 
Just for the record I'm about 98.7% sure that the root problem here was 
that the LVM stuff (pvcreate, vgcreate, lvcreate) was done when booted 
from systemrescuecd and had nothing to do with replacing a failed drive.


The ouptut from 'pvcreate --version' on the systemrescuecd is:
  LVM version: 2.02.33 (2008-01-31)
  Library version: 1.02.26 (2008-06-06)
  Driver version:  4.13.0

And when booted from CentOS 5.2:
  LVM version: 2.02.32-RHEL5 (2008-03-04)
  Library version: 1.02.24 (2007-12-20)
  Driver version:  4.11.5

When [pv|vg|lv]create is done like it should have been (after booting 
CentOS) snapshot volume creation works as expected even after replacing a 
failed drive.


On Thu, 17 Jul 2008, Mike wrote:

I thought I'd test replacing a failed drive in a 4 drive raid 10 array on a 
CentOS 5.2 box before it goes online and before a drive really fails.


I 'mdadm failed, removed', powered off, replaced drive, partitioned with 
sfdisk -d /dev/sda | sfdisk /dev/sdb, and finally 'mdadm add'ed'.


Everything seems fine until I try to create a snapshot lv.  (Creating a 
snapshot lv worked before I replaced the drive.)  Here's what I'm seeing.


# lvcreate -p r -s -L 8G -n home-snapshot /dev/vg0/homelv
 Couldn't find device with uuid 'yIIGF9-9f61-QPk8-q6q1-wn4D-iE1x-MJIMgi'.
 Couldn't find all physical volumes for volume group vg0.
 Volume group for uuid not found: 
I4Gf5TUB1M1TfHxZNg9cCkM1SbRo8cthCTTjVHBEHeCniUIQ03Ov4V1iOy2ciJwm

 Aborting. Failed to activate snapshot exception store.


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[CentOS] RE: lvm errors after replacing drive in raid 10 array

2008-07-17 Thread Mike 


On Thu, 17 Jul 2008, Ross S. W. Walker wrote:



It would be interesting to see what the mdadm --detail /dev/mdX
says.

I see the VG is made out of 1 PV md3? What are md0,1,2 doing, I
can guess md0 is probably /boot, but what about 1 and 2?

It wouldn't hurt to give the sfdisk partition dumps for the
drives in question too.

-Ross



Thanks for the reply.  md2 is /boot, md0 is /root and md1 is swap.


# mdadm --detail /dev/md3
/dev/md3:
Version : 00.90.03
  Creation Time : Fri Jul  4 17:11:30 2008
 Raid Level : raid10
 Array Size : 947883008 (903.97 GiB 970.63 GB)
  Used Dev Size : 473941504 (451.99 GiB 485.32 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 3
Persistence : Superblock is persistent

Update Time : Thu Jul 17 15:58:52 2008
  State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

 Layout : near=1, far=2
 Chunk Size : 256K

   UUID : 7ecb1de6:c6e22a3a:1bd5446a:1dcd5444
 Events : 0.3852

Number   Major   Minor   RaidDevice State
   0   840  active sync   /dev/sda4
   1   8   201  active sync   /dev/sdb4
   2   8   362  active sync   /dev/sdc4
   3   8   523  active sync   /dev/sdd4


# sfdisk -l /dev/sda

Disk /dev/sda: 60801 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start End   #cyls#blocks   Id  System
/dev/sda1   *  0+ 12  13-104391   fd  Linux raid 
autodetect
/dev/sda2 1312871275   10241437+  fd  Linux raid 
autodetect
/dev/sda3   12881797 5104096575   fd  Linux raid 
autodetect
/dev/sda4   1798   60800   59003  473941597+  fd  Linux raid 
autodetect


# sfdisk -l /dev/sdb

Disk /dev/sdb: 60801 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start End   #cyls#blocks   Id  System
/dev/sdb1   *  0+ 12  13-104391   fd  Linux raid 
autodetect
/dev/sdb2 1312871275   10241437+  fd  Linux raid 
autodetect
/dev/sdb3   12881797 5104096575   fd  Linux raid 
autodetect
/dev/sdb4   1798   60800   59003  473941597+  fd  Linux raid 
autodetect


# sfdisk -l /dev/sdc

Disk /dev/sdc: 60801 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start End   #cyls#blocks   Id  System
/dev/sdc1   *  0+ 12  13-104391   fd  Linux raid 
autodetect
/dev/sdc2 1312871275   10241437+  fd  Linux raid 
autodetect
/dev/sdc3   12881797 5104096575   fd  Linux raid 
autodetect
/dev/sdc4   1798   60800   59003  473941597+  fd  Linux raid 
autodetect


# sfdisk -l /dev/sdd

Disk /dev/sdd: 60801 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start End   #cyls#blocks   Id  System
/dev/sdd1   *  0+ 12  13-104391   fd  Linux raid 
autodetect
/dev/sdd2 1312871275   10241437+  fd  Linux raid 
autodetect
/dev/sdd3   12881797 5104096575   fd  Linux raid 
autodetect
/dev/sdd4   1798   60800   59003  473941597+  fd  Linux raid 
autodetect

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