[CentOS] what is difference between "slow initialize" and "patrol read" on RAID?
Peter Kjellström
cap at nsc.liu.se
Wed Jun 8 20:38:58 UTC 2011
On Wednesday, June 08, 2011 09:00:48 PM mcclnx mcc wrote:
> We have DELL server with MD1000 Disk array in it. O.S. is CENTOS 5.5.
> Recently every time MD1000 "patrol read" start I will get "media error"
> messages on /var/log/message file.
>
> I use MD1000 "slow initialize" to initialize "bad disk" and NO error.
> After "slow initialize" finish, I manually "startup patrol read". I
> continue get "media error" on /var/log/message.
>
> Anyone know what difference between "slow initialize" and "patrol read"?
Only Dell really knows what they mean by it.
But here are some random thoughts:
* Slow init may write all of the disk during init but maybe:
1) no errors happen during write
2) it notices an error but retries silently
3) it notices an error but has sucky error reporting
* Patrolread (may) compare parity data and report this as "media error"
(a type of error slow init probably wouldn't detect)
* The I/O pattern of patrolread compared to slow init provoks an error
You could try to take this issue over to the poweredge-linux mailing list or
just case the bad drive with dell support.
/Peter
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