[CentOS] rescheduling sector linux raid ?

Mon Feb 14 18:39:18 UTC 2011
Robert Heller <heller at deepsoft.com>

At Mon, 14 Feb 2011 20:13:31 +0200 CentOS mailing list <centos at centos.org> wrote:

> 
> Hi List,
> 
> What this means?
> 
> md: syncing RAID array md0
> md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
> md: using maximum available idle IO bandwidth (but not more than
> 200000 KB/sec) for reconstruction.
> md: using 128k window, over a total of 2096384 blocks.
> md: md0: sync done.
> RAID1 conf printout:
>  --- wd:2 rd:2
>  disk 0, wo:0, o:1, dev:sda2
>  disk 1, wo:0, o:1, dev:sdb2
> sd 0:0:0:0: SCSI error: return code = 0x06000000
> end_request: I/O error, dev sda, sector 451792231
> raid1: sda1: rescheduling sector 451792168
> sd 0:0:0:0: SCSI error: return code = 0x06000000
> end_request: I/O error, dev sda, sector 451792263
> raid1: sda1: rescheduling sector 451792200
> raid1: sdb1: redirecting sector 451792168 to another mirror
> raid1: sdb1: redirecting sector 451792200 to another mirror
> md: syncing RAID array md0
> md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
> md: using maximum available idle IO bandwidth (but not more than
> 200000 KB/sec) for reconstruction.
> md: using 128k window, over a total of 2096384 blocks.
> md: md0: sync done.
> RAID1 conf printout:
>  --- wd:2 rd:2
>  disk 0, wo:0, o:1, dev:sda2
>  disk 1, wo:0, o:1, dev:sdb2
> 
> note lines:
> 
> sd 0:0:0:0: SCSI error: return code = 0x06000000
> end_request: I/O error, dev sda, sector 451792263
> raid1: sda1: rescheduling sector 451792200
> raid1: sdb1: redirecting sector 451792168 to another mirror
> raid1: sdb1: redirecting sector 451792200 to another mirror
> 
> Is one disk going down? cat /proc/mdstat still shows software raid
> array as working one.

One disk is probably starting to fail.  Are you getting SMART errors? 
Have a look in /var/log/messages for smartd messages as well as kernel
I/O errors.

-- 
Robert Heller             -- 978-544-6933 / heller at deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
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