Hi Dean,
I just make some test for you, in a virtual machine
First, I buid a similar environment, with lvm and raid1, over two
disk, with VG vg_medulla_bkup and LV lv_bkup
[root@rhel6 ~]# mdadm --assemble /dev/md1 /dev/sdb1 /dev/sdc1
mdadm: /dev/md1 has been started with 2 drives.
[root@rhel6 ~]# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdb1[0] sdc1[1]
2095415 blocks super 1.2 [2/2] [UU]
unused devices: <none>
[root@rhel6 ~]# pvscan
PV /dev/sda2 VG vg00 lvm2 [7.90 GiB / 1.04 GiB free]
PV /dev/md1 VG vg_medulla_bkup lvm2 [2.00 GiB / 1020.00 MiB free]
Total: 2 [9.89 GiB] / in use: 2 [9.89 GiB] / in no VG: 0 [0 ]
[root@rhel6 ~]# vgchange -a y vg_medulla_bkup
1 logical volume(s) in volume group "vg_medulla_bkup" now active
[root@rhel6 ~]# mount /dev/vg_medulla_bkup/lv_bkup /mnt/deanm/
[root@rhel6 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg00-root
6047492 1162084 4578208 21% /
tmpfs 510236 0 510236 0% /dev/shm
/dev/sda1 99150 25380 68650 27% /boot
/dev/mapper/vg_medulla_bkup-lv_bkup
1032088 34088 945572 4% /mnt/deanm
Then, I remove disk /dev/sdb and /dev/sdc
[root@rhel6 ~]# pvscan
/dev/md1: read failed after 0 of 1024 at 0: Input/output error
/dev/md1: read failed after 0 of 1024 at 2145583104: Input/output error
/dev/md1: read failed after 0 of 1024 at 2145693696: Input/output error
/dev/md1: read failed after 0 of 1024 at 4096: Input/output error
/dev/md1: read failed after 0 of 2048 at 0: Input/output error
/dev/vg_medulla_bkup/lv_bkup: read failed after 0 of 4096 at
1073676288: Input/output error
/dev/vg_medulla_bkup/lv_bkup: read failed after 0 of 4096 at
1073733632: Input/output error
/dev/vg_medulla_bkup/lv_bkup: read failed after 0 of 4096 at 0:
Input/output error
/dev/vg_medulla_bkup/lv_bkup: read failed after 0 of 4096 at 4096:
Input/output error
/dev/sdb1: read failed after 0 of 1024 at 2146697216: Input/output error
/dev/sdb1: read failed after 0 of 1024 at 2146754560: Input/output error
/dev/sdb1: read failed after 0 of 1024 at 0: Input/output error
/dev/sdb1: read failed after 0 of 1024 at 4096: Input/output error
/dev/sdb1: read failed after 0 of 2048 at 0: Input/output error
/dev/sdc1: read failed after 0 of 1024 at 2146697216: Input/output error
/dev/sdc1: read failed after 0 of 1024 at 2146754560: Input/output error
/dev/sdc1: read failed after 0 of 1024 at 0: Input/output error
/dev/sdc1: read failed after 0 of 1024 at 4096: Input/output error
/dev/sdc1: read failed after 0 of 2048 at 0: Input/output error
PV /dev/sda2 VG vg00 lvm2 [7.90 GiB / 1.04 GiB free]
Total: 1 [7.90 GiB] / in use: 1 [7.90 GiB] / in no VG: 0 [0 ]
[root@rhel6 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg00-root
6047492 1162104 4578188 21% /
tmpfs 510236 0 510236 0% /dev/shm
/dev/sda1 99150 25380 68650 27% /boot
/dev/mapper/vg_medulla_bkup-lv_bkup
1032088 34088 945572 4% /mnt/deanm
You have new mail in /var/spool/mail/root
[root@rhel6 ~]# ls -la /mnt/deanm/
ls: reading directory /mnt/deanm/: Input/output error
total 0
----------
In nets spet, I add disk /dev/sdb and /dev/sdc to this virtual machine
----------
[root@rhel6 ~]# fdisk -l /dev/sdb
Disk /dev/sdb: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xaa95dac1
Device Boot Start End Blocks Id System
/dev/sdb1 1 261 2096451 fd Linux raid autodetect
[root@rhel6 ~]# fdisk -l /dev/sdc
Disk /dev/sdc: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xad4c606c
Device Boot Start End Blocks Id System
/dev/sdc1 1 261 2096451 fd Linux raid autodetect
[root@rhel6 ~]# mdadm --detail /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Sat Nov 13 00:42:57 2010
Raid Level : raid1
Array Size : 2095415 (2046.65 MiB 2145.70 MB)
Used Dev Size : 2095415 (2046.65 MiB 2145.70 MB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sat Nov 13 01:08:50 2010
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 33 1 active sync /dev/sdc1
0 8 17 - faulty spare /dev/sdb1
[root@rhel6 ~]# mdadm /dev/md1 -r /dev/sdb1
mdadm: hot removed /dev/sdb1 from /dev/md1
[root@rhel6 ~]# mdadm /dev/md1 -a /dev/sdb1
mdadm: re-added /dev/sdb1
[root@rhel6 ~]# mdadm --detail /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Sat Nov 13 00:42:57 2010
Raid Level : raid1
Array Size : 2095415 (2046.65 MiB 2145.70 MB)
Used Dev Size : 2095415 (2046.65 MiB 2145.70 MB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sat Nov 13 01:10:54 2010
State : clean, degraded, recovering
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Rebuild Status : 36% complete
Name : rhel6.local:1 (local to host rhel6.local)
UUID : 0794f631:cdffe9e8:a25618e5:f98452f8
Events : 101
Number Major Minor RaidDevice State
0 8 17 0 spare rebuilding /dev/sdb1
1 8 33 1 active sync /dev/sdc1
[root@rhel6 ~]# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdb1[0] sdc1[1]
2095415 blocks super 1.2 [2/1] [_U]
[===========>.........] recovery = 57.2% (1200000/2095415)
finish=0.0min speed=200000K/sec
unused devices: <none>
Check the output of pvscan command:
[root@rhel6 ~]# pvscan
PV /dev/sda2 VG vg00 lvm2 [7.90 GiB / 1.04 GiB free]
PV /dev/md1 VG vg_medulla_bkup lvm2 [2.00 GiB / 1020.00 MiB free]
Total: 2 [9.89 GiB] / in use: 2 [9.89 GiB] / in no VG: 0 [0 ]
Reactivate VG:
[root@rhel6 ~]# vgchange -a y vg_medulla_bkup
1 logical volume(s) in volume group "vg_medulla_bkup" now active
[root@rhel6 ~]# mount /dev/vg_medulla_bkup/lv_bkup /mnt/deanm/
[root@rhel6 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg00-root
6047492 1162148 4578144 21% /
tmpfs 510236 0 510236 0% /dev/shm
/dev/sda1 99150 25380 68650 27% /boot
/dev/mapper/vg_medulla_bkup-lv_bkup
1032088 34088 945572 4% /mnt/deanm
[root@rhel6 ~]# ls -la /mnt/deanm/
total 24
drwxr-xr-x. 3 root root 4096 Nov 13 00:44 .
drwxr-xr-x. 3 root root 4096 Nov 13 00:44 ..
drwx------. 2 root root 16384 Nov 13 00:44 lost+found
[root@rhel6 ~]#
Regards,
--
Laurentiu Coica
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