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Re: Software RAID5 Horrible Write Speed On 3ware Controller!!

from [Justin Piszcz] [Permanent Link][Original]
To: Hannes Dorbath <light@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: Software RAID5 Horrible Write Speed On 3ware Controller!!
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Wed, 18 Jul 2007 07:38:12 -0400 (EDT)
Cc: Gabor Gombas <gombasg@xxxxxxxxx>, linux-ide-arrays@xxxxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, linux@xxxxxxxxxxxxxxx
In-reply-to: <469DFB6B.2000103@theendofthetunnel.de>
References: <Pine.LNX.4.64.0707180614480.7659@p34.internal.lan> <20070718110525.GF13772@boogie.lpds.sztaki.hu> <Pine.LNX.4.64.0707180718000.7659@p34.internal.lan> <469DF8D3.8020908@theendofthetunnel.de> <Pine.LNX.4.64.0707180732140.7659@p34.internal.lan> <469DFB6B.2000103@theendofthetunnel.de>
Sender: xfs-bounce@xxxxxxxxxxx 


On Wed, 18 Jul 2007, Hannes Dorbath wrote:

On 18.07.2007 13:32, Justin Piszcz wrote:
Yes I agree here, but I guess my question is why is SW RAID5 so slow on the 3ware card?

I think the controller does disable the drives write cache when exported unconfigured. It does always disable, unless you put the drive in a unit and explicit set the profile to `Performance'.


--
Regards,
Hannes Dorbath


Ahh, that could explain it!


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