Re: Extremely slow write speeds to disk : FreeBSD 7.1 and Dell SAS 6/iR Adapter

[Richard Tector]

Bradley Radjoo wrote:
Greetings,

Please can you assist.

I have attempted most of the popular BSD Variants such as NetBSD, Open
BSD, FreeBSD...
The only distrubution that seems to work on the is Dell SAS 6/iR Adapter
is FreeBSD 7.1
Firmware version & date : 9/29/2008 00.25.47.00

But the issue is that writing to disk is extremely slow...i.e. 14Mb per
second....

If I install any other linux distribution, like CentOS, write speek is
the way it should be..it averages around 190Mb+ per second

I was hoping if it were at all possible for you to assist me in with a
later RAID Controller Driver for the SAS 6/iR Adapter

Try:
hw.mpt.enable_sata_wc=1
in /boot/loader.conf and reboot.

Assuming you are using SATA drives, the write cache is disabled by 
default. This reenables it. The mpt manpage holds more information.

Regards,

Richard
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