7.1, mpt and slow writes

[Richard Tector]

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

Seems to work just fine for me.

Regards,

Richard
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