[CentOS] rescheduling sector linux raid ?

[yonatan pingle]

take a closer look at the message it states:
end_request: I/O error, dev sda, sector 451792263

this usually indicates there is corruption on the disk.

the meaning is quite simple, you have a problem with your first disk
/dev/sda , and you need to investigate it further.

first of all run a smartctl --all /dev/sda
look for FAIL messages, this will help indicate the cause of the I/O error.

second step - to be sure its a bad disk ( sometimes it's not actually
the disk ).
check the cable connecting the disk , and replace it with a fresh one
if available.
also, i would recommend to check the power cable/supply this might
cause I/O errors also.





On Mon, Feb 14, 2011 at 8:39 PM, Robert Heller <heller at deepsoft.com> wrote:
> 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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-- 
Best Regards,
Yonatan Pingle
RHCT | RHCSA | CCNA1