extremely slow write performance plaintext

[Cory Coager]

On 01/14/2011 02:51 PM, Stan Hoeppner wrote:
> Make sure the write cache on the P600 (what size is it BTW?) is enabled and that
> the BBU is in working order.  Also make sure the P600 is disabling the write
> caches on the drives themselves.  Then...
>
Write cache is enabled on the controller, the size is 512MB, BBU is in 
good conditioned (checked with the HP utility).  How do I check the 
write cache on the drives?
> Mount with 'nobarrier' so XFS isn't interfering with the hardware cache
> performance of the P600.  With barriers enabled (the default) XFS will
> periodically flush the cache on the RAID card causing write performance problems.
>
Already using nobarrier.



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