Very slow HP 8 Internal Port SAS HBA with RAID 0, 1 on Hot Plug SAS/SATA Models (LSI SAS1068 - mpt)

[Richard Tector]

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
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