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List:       freebsd-questions
Subject:    Re: mpt(4) enabling write cache on raw disk
From:       Darren Baginski <kickbsd () yandex ! com>
Date:       2012-07-30 15:18:44
Message-ID: 195811343661524 () web9h ! yandex ! ru
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29.07.2012, 17:00, "Stefan Johansson" <steve.johansson@telia.com>:
> Hello!
> 
> I have a HP 3080X SAS/SATA 8 port mpt(4) controller card that I want to use in
> a ZFS setup.
> My problem is that the write cache is not enabled on disks that are not a part of a \
> RAID volume (RAID0 or RAID1). The write speed is limited to about 20MB/s with both \
> UFS and ZFS. If I create a RAID0 volume with mptutil(8) and then destroy it, write \
> cache gets enabled and the write speed reaches about 60MB/s with UFS and ZFS. \
> Unfortunately it won't survive a reboot. 
> Has anyone else seen this problem with mpt(4) controllers and/or knows how to fix \
> it?

I have to create 8 raid0 volumes consisting of one drive, and then enable 
#/usr/sbin/mptutil volume  cache  0 enable
#/usr/sbin/mptutil volume  cache  1 enable


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