how to get rid of bad blocks in a file on PERC 5/I?

Patrick_Fischer at Patrick_Fischer at
Mon May 3 04:46:15 CDT 2010

Consistency Check:
Check consistency. A check consistency determines the integrity of a virtual disk's redundant data. When necessary, this feature rebuilds the redundant information.

the remapping of bad sectors should be run automatically if the sector can't be written and the controller try to write or read from it.

Please check all times the controller log if you got filesystem erros like you described.
Check the log for Bad LBA's on the disk like searching the log file with "bad"
Check the Count of the LBA's and check if it occurs on multiple disks like a punctured stripe....

The log you can get per megacli or open manage:

Server Administrator cli:
omconfig storage controller action=exportlog controller=0
where controller 0 = id of the involved controller

Megacli -FwTermLog -Dsply -a0 > log.txt
- where a0 = controller 0

Best Regards/ Mit freundlichen Grüßen 
Patrick Fischer
Senior Server Analyst 
Dell | Global Support Services

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-----Original Message-----
From: linux-poweredge-bounces at [mailto:linux-poweredge-bounces at] On Behalf Of Tim Small
Sent: Saturday, May 01, 2010 12:17 PM
To: Adam Nielsen
Cc: linux-poweredge-Lists
Subject: Re: how to get rid of bad blocks in a file on PERC 5/I?

On 01/05/10 07:16, Adam Nielsen wrote:
> disks, as long as the hardware RAID controller can keep up with the disks
> there would be no difference in performance.

I remember reading a benchmark which showed that under random I/O 
patterns, the Linux software RAID performed better on a (from memory) 8 
disks RAID5, due to better use of SCSI scatter/gather.  I think this was 
vs. MegaRAID, but was a while ago.  I've not carried out any benchmarks 
myself, and no idea whether this goes for SATA NCQ as well...


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