Re: 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.


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

Seems to work just fine for me.

Regards,

Richard

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)

smime.p7s
Description: S/MIME Cryptographic Signature