[CentOS] Software RAID1 Failure Help

[Chris Stone]

Sure, replace the bad drive and rebuild build the mirror. Or add 2 drives,
using one to replace the bad one and the other as a hot spare. Then if one
of the 2 drives in the mirror fails again, the hot spare will take over for
it.


Chris


On Fri, Feb 7, 2014 at 3:47 PM, Matt <matt.mailinglists at gmail.com> wrote:

> I am running software RAID1 on a somewhat critical server.  Today I
> noticed one drive is giving errors.  Good thing I had RAID.  I planned
> on upgrading this server in next month or so.  Just wandering if there
> was an easy way to fix this to avoid rushing the upgrade?  Having a
> single drive is slowing down reads as well, I think.
>
> Thanks.
>
>
>
>
> Feb 7 15:28:28 server smartd[2980]: Device: /dev/sdb [SAT], 1
> Currently unreadable (pending) sectors
> Feb 7 15:28:28 server smartd[2980]: Device: /dev/sdb [SAT], 1 Offline
> uncorrectable sectors
> Feb 7 15:58:29 server smartd[2980]: Device: /dev/sdb [SAT], 1
> Currently unreadable (pending) sectors
> Feb 7 15:58:29 server smartd[2980]: Device: /dev/sdb [SAT], 1 Offline
> uncorrectable sectors
>
>
> [root at server ~]# smartctl -H /dev/sda
>
> === START OF READ SMART DATA SECTION ===
> SMART overall-health self-assessment test result: PASSED
>
> [root at server ~]# smartctl -H /dev/sdb
>
> === START OF READ SMART DATA SECTION ===
> SMART overall-health self-assessment test result: PASSED
>
> [root at server ~]# df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/md2 1.4T 142G 1.2T 12% /
> /dev/md0 99M 37M 58M 39% /boot
> tmpfs 7.9G 20K 7.9G 1% /dev/shm
>
>
> [root at server ~]# cat /proc/mdstat
> Personalities : [raid1]
> md0 : active raid1 sdb1[1] sda1[0]
> 104320 blocks [2/2] [UU]
>
> md1 : active raid1 sdb2[1] sda2[0]
> 8385856 blocks [2/2] [UU]
>
> md2 : active raid1 sdb3[2](F) sda3[0]
> 1456645568 blocks [2/1] [U_]
>
> unused devices: <none>
>
>
> [root at server ~]# mdadm --detail /dev/md2
> /dev/md2:
> Version : 0.90
> Creation Time : Tue Jan 4 05:39:36 2011
> Raid Level : raid1
> Array Size : 1456645568 (1389.17 GiB 1491.61 GB)
> Used Dev Size : 1456645568 (1389.17 GiB 1491.61 GB)
> Raid Devices : 2
> Total Devices : 2
> Preferred Minor : 2
> Persistence : Superblock is persistent
>
> Update Time : Fri Feb 7 15:21:45 2014
> State : active, degraded
> Active Devices : 1
> Working Devices : 1
> Failed Devices : 1
> Spare Devices : 0
>
> Events : 0.758203
>
> Number Major Minor RaidDevice State
> 0 8 3 0 active sync /dev/sda3
> 1 0 0 1 removed
>
> 2 8 19 - faulty spare /dev/sdb3
>
>
> [root at server ~]# mdadm --detail /dev/md1
> /dev/md1:
> Version : 0.90
> Creation Time : Tue Jan 4 05:39:36 2011
> Raid Level : raid1
> Array Size : 8385856 (8.00 GiB 8.59 GB)
> Used Dev Size : 8385856 (8.00 GiB 8.59 GB)
> Raid Devices : 2
> Total Devices : 2
> Preferred Minor : 1
> Persistence : Superblock is persistent
>
> Update Time : Fri Feb 7 14:29:36 2014
> State : clean
> Active Devices : 2
> Working Devices : 2
> Failed Devices : 0
> Spare Devices : 0
>
> Events : 0.460
>
> Number Major Minor RaidDevice State
> 0 8 2 0 active sync /dev/sda2
> 1 8 18 1 active sync /dev/sdb2
>
>
> [root at server ~]# mdadm --detail /dev/md0
> /dev/md0:
> Version : 0.90
> Creation Time : Tue Jan 4 05:48:17 2011
> Raid Level : raid1
> Array Size : 104320 (101.89 MiB 106.82 MB)
> Used Dev Size : 104320 (101.89 MiB 106.82 MB)
> Raid Devices : 2
> Total Devices : 2
> Preferred Minor : 0
> Persistence : Superblock is persistent
>
> Update Time : Wed Feb 5 11:02:25 2014
> State : clean
> Active Devices : 2
> Working Devices : 2
> Failed Devices : 0
> Spare Devices : 0
>
> Events : 0.460
>
> Number Major Minor RaidDevice State
> 0 8 1 0 active sync /dev/sda1
> 1 8 17 1 active sync /dev/sdb1
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-- 
Chris Stone
AxisInternet, Inc.
www.axint.net