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Date:      Thu, 29 Jan 2009 11:43:46 +0000
From:      Richard Tector <richardtector@thekeelecentre.com>
To:        Charles Sprickman <spork@bway.net>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: 7.1, mpt and slow writes
Message-ID:  <49819672.1090208@thekeelecentre.com>
In-Reply-To: <alpine.OSX.2.00.0901290351250.37588@toasty.nat.fasttrackmonkey.com>
References:  <alpine.OSX.2.00.0901290351250.37588@toasty.nat.fasttrackmonkey.com>

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Charles Sprickman wrote:
> Hello,
> 
> I think this needs a few more eyes:
> 
> http://lists.freebsd.org/pipermail/freebsd-scsi/2009-January/003782.html
> 
> In short, writes are slow, likely do to the write-cache being enabled on 
> the controller.  The sysctl used in 6.x to turn the cache off don't seem 
> to be in 7.x.

I have two Dell 860's here also running 7.1-REL.
A simple dd on one shows roughly 60MB/s writes to a mirror of 2 320GB 
disks on what I'm assuming is the same LSI controller card (SAS5)

richard@moses:~# cat /boot/loader.conf
hw.mpt.enable_sata_wc=1

Seems to work just fine for me.

Regards,

Richard

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