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poor write performance on SRCSATAWB raid controller.

idata
Employee
‎08-29-2012 12:46 AM
1,431 Views

Hi,

I have 4 SATA drives running in RAID5 and i observe very poor write performance on that array.

I am runnig Debian with kernel 2.6.32-5-amd64.

Here are configuration data for my array : http://dl.dropbox.com/u/93773461/raid_cfg.txt http://dl.dropbox.com/u/93773461/raid_cfg.txt

and here is benchamrk output : http://dl.dropbox.com/u/93773461/bench.txt http://dl.dropbox.com/u/93773461/bench.txt

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idata
Employee
‎08-29-2012 03:47 PM
552 Views

Konrad,

RAID 5 will have less write performance than other RAID levels because parity must be calculated and written on each write. That said, see the document on http://www.intel.com/support/motherboards/server/sb/CS-029227.htm Configuring Intel® RAID Controllers for optimal performance which includes the SRCSATAWB controller.

Regards, John

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