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How to fsck a mounted raid device /dev/md2 ?
Posted on 2013-01-01
Hi,
I would like to request an assistant.
It seems that my /var/log/messages having the following error message :
Jan 1 11:24:26 srv9 kernel: raid1: sdb: unrecoverable I/O read error for block 286895360
My cat /proc/mdstat shows as follows :
root@srv9 [~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
md1 : active raid1 sdb2[1] sda2[0]
2096384 blocks [2/2] [UU]
md2 : active raid1 sda3[2](S) sdb3[1]
310367680 blocks [2/1] [_U]
My mdadm --detail /dev/md2 shows as follows :
root@srv9 [/]# mdadm --detail /dev/md2
/dev/md2:
Version : 0.90
Creation Time : Fri May 30 17:11:49 2008
Raid Level : raid1
Array Size : 310367680 (295.99 GiB 317.82 GB)
Used Dev Size : 310367680 (295.99 GiB 317.82 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Tue Jan 1 23:24:58 2013
State : clean, degraded
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
UUID : 273f6c1b:0e438923:11f1305b
Events : 0.9388326
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 19 1 active sync /dev/sdb3
2 8 3 - spare /dev/sda3
SUMMARY
=========
1. /var/log/messages shows sdb which having the error.
2. /proc/mdstat shows sda3[2](S) device which is degraded and becoming spare.
3. /dev/sdb3 is my actual /dev/md2 current active mounted partition .
I believe my /dev/sdb3 is having filesystem error that need to be fixed but it is actually current active raid partition.
May i know the simplest way to fsck the drive ? If possible without boot it using linux rescue disk ?
I found the following article :
http://wiki.sabayon.org/index.php?title=HOWTO:_Repair_filesystem_using_fsck_on_a_raid_setup
But in the article does not mentioned that i need to unmounted the /dev/md2 device first , afaik the fsck must be run on unmounted device to avoid data corruption.
FYI, the /dev/sdb3 is still active mounted as /dev/md2 .
Should i fsck /dev/sda3 or /dev/sdb3 ? and how ?
Appreciates anybody assistant on this.
Thank you.
I would like to request an assistant.
It seems that my /var/log/messages having the following error message :
Jan 1 11:24:26 srv9 kernel: raid1: sdb: unrecoverable I/O read error for block 286895360
My cat /proc/mdstat shows as follows :
root@srv9 [~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
md1 : active raid1 sdb2[1] sda2[0]
2096384 blocks [2/2] [UU]
md2 : active raid1 sda3[2](S) sdb3[1]
310367680 blocks [2/1] [_U]
My mdadm --detail /dev/md2 shows as follows :
root@srv9 [/]# mdadm --detail /dev/md2
/dev/md2:
Version : 0.90
Creation Time : Fri May 30 17:11:49 2008
Raid Level : raid1
Array Size : 310367680 (295.99 GiB 317.82 GB)
Used Dev Size : 310367680 (295.99 GiB 317.82 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Tue Jan 1 23:24:58 2013
State : clean, degraded
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
UUID : 273f6c1b:0e438923:11f1305b
Events : 0.9388326
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 19 1 active sync /dev/sdb3
2 8 3 - spare /dev/sda3
SUMMARY
=========
1. /var/log/messages shows sdb which having the error.
2. /proc/mdstat shows sda3[2](S) device which is degraded and becoming spare.
3. /dev/sdb3 is my actual /dev/md2 current active mounted partition .
I believe my /dev/sdb3 is having filesystem error that need to be fixed but it is actually current active raid partition.
May i know the simplest way to fsck the drive ? If possible without boot it using linux rescue disk ?
I found the following article :
http://wiki.sabayon.org/index.php?title=HOWTO:_Repair_filesystem_using_fsck_on_a_raid_setup
But in the article does not mentioned that i need to unmounted the /dev/md2 device first , afaik the fsck must be run on unmounted device to avoid data corruption.
FYI, the /dev/sdb3 is still active mounted as /dev/md2 .
Should i fsck /dev/sda3 or /dev/sdb3 ? and how ?
Appreciates anybody assistant on this.
Thank you.
3-
2
- +1
7 Comments
Active today
You DON'T fsck a mounted device, at least not if you want to prevent data corruption.
Boot the system to a USB stick with linux on it, then fsck.
Boot the system to a USB stick with linux on it, then fsck.
Active 6 days ago
Hi,
Do you mean the following articles is wrong ?
http://wiki.sabayon.org/index.php?title=HOWTO:_Repair_filesystem_using_fsck_on_a_raid_setup
It does not unmounted the /dev/md2 before fsck right ?
Do you mean the following articles is wrong ?
http://wiki.sabayon.org/index.php?title=HOWTO:_Repair_filesystem_using_fsck_on_a_raid_setup
It does not unmounted the /dev/md2 before fsck right ?
Active today
Yes it is wrong. Read this, it is derived from the kernel.org and the authors of the mdraid code itself ..
http://www.tldp.org/HOWTO/Software-RAID-0.4x-HOWTO-4.html
http://www.tldp.org/HOWTO/Software-RAID-0.4x-HOWTO-4.html
Active 7 days ago
What is it mounted as?
If it's prt of the operating system then you'll need to boot from other medi, if not then try unmounting it
If it's prt of the operating system then you'll need to boot from other medi, if not then try unmounting it
Active 6 days ago
Hi,
It is mounted as "/" .
So i guest eventhough it is a raid array, i still need to boot using other media and fsck it.
It is mounted as "/" .
So i guest eventhough it is a raid array, i still need to boot using other media and fsck it.
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