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Date: Tue, 31 Oct 2006 10:27:56 +0000
From: Tom Judge <tom@tomjudge.com>
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To: Fredrik Widlund <fredrik.widlund@qbrick.com>
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Cc: freebsd-stable@freebsd.org, Ivan Voras <ivoras@fer.hr>
Subject: Re: SAS Raid - mfi driver
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Fredrik Widlund wrote:
> Ivan Voras wrote:
>   
>> Several:
>>
>> - are there cache differences between the controllers (amount of
>> memory, cache policy)?
>>     
> Default settings on both.
>   
>> - how does writing directly to the device (bypassing file system)
>> compare?
>>     
> Drives are four seagate 7200.10 400GB in a Raid-5 configuration.
>
> [/mnt/test (/dev/mfid0p1 mounted)]
> read: 200MB/s
> write: 15MB/s
>
> [/dev/mfid0p1]
> read: 200MB/s
> write: 8MB/s
>
> [/dev/mfid0]
> read: 200MB/s
> write: 10MB/s
>
> Kind regards,
> Fredrik Widlund
>
>
>   
Have you tried setting the write cache policy to write back rather than 
write thru?

Tom