Bad 3ware 9000 performance 5.4?

[Steven Hartland]

Also check out the recent thread on RAID performance on this list for
additional info on speeding up RAID performance. I was able to increase
from:
Read: ~50MB/s
Write: ~150MB/s
to:
Read: ~200MB/s
Write: ~150MB/s

   Steve / K
----- Original Message ----- 
From: "Martin Nilsson" <martin at gneto.com>
 
> I have noticed that the MegaRAID SATA cards sometimes disables the write 
> cache on Seagate SATA drives, resulting in a write performance of about 
> 6MB/s. Can you check if the 3ware also does this. I have had arrays were 
> only one disk had write cache disabled and it totally ruined the 
> performance of the whole array.
> 
> As always be sure to have a good UPS if you are using write cache on the 
> disks! With the sad state of todays ATA/SATA disks turning of write 
> caching in the drive is often not an option.



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