Very slow HP 8 Internal Port SAS HBA with RAID 0, 1 on Hot Plug
SAS/SATA Models (LSI SAS1068 - mpt)
Stefan Lambrev
stefan.lambrev at moneybookers.com
Wed Oct 17 09:39:44 PDT 2007
Hi,
Richard Tector wrote:
> Stefan Lambrev wrote:
>> Hi list,
>>
>> I'm having problems with the raid controller of HP ProLiant DL140 G3
>> Server and RELENG_7
>>
>> I have 2x 500GB SATA HDDs configured as mirror, but the write speed
>> is very slow ~7MB/s.
>>
>> I guess that there is no battery for the raid controller and the
>> write cache is off, but 7MB/s ..
>> Also there is no way to see the status of the raid from FreeBSD ?
>>
>> Any ideas how to improve this?
>
> Write cache is the most probable cause.
> You can force it on with:
> hw.mpt.enable_sata_wc=1
> See:
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/mpt/mpt.c?rev=1.42;content-type=text%2Fx-cvsweb-markup
>
>
> Hope that helps.
>
> Regards,
>
> Richard Tector
This have to be put in /boot/loader.conf as I do not see such sysctl?
Anyway I'll force the write cache to be always on from the raid
configuration if this does not work.
--
Best Wishes,
Stefan Lambrev
ICQ# 24134177
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