From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Scobie <richard@sauce.co.nz>
Subject: Re: xfs > md 50% write performance drop on .30+ kernel?
Date: Wed, 14 Oct 2009 08:53:08 +1300
Message-ID: <4AD4DAA4.4080703@sauce.co.nz>
References: <66781b10910120958k4afb637ejba79e4c23900c4da@mail.gmail.com> <4AD3F64F.6070908@sauce.co.nz> <4AD454A0.3050704@shiftmail.org>
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To: Asdo <asdo@shiftmail.org>
Cc: linux-raid <linux-raid@vger.kernel.org>
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Asdo wrote:

> Do you think it was controller's overhead? I have heard mixed opinions 
> about 3wares. What are the fastest controllers around for MD-raid use?

The fastest setup I have found have been LSI SAS cards - LSISAS3442E-R, 
with the onboard RAID firmware replaced with the IT firmware.

This is connected to port expander based JBOD chassis loaded with either 
  SAS or SATA drives.

Regards,

Richard