LSI1064 and LSI1064E and mpt

[Matthew Jacob]

On 10/17/06, Johannes.Kruger at nokia.com <Johannes.Kruger at nokia.com> wrote:
> Hi Matthew.
> I gave up on the PCI-express version of the card for the time being.

My contact at LSI hasn't gotten back to me.

> The PCI-X running the same firmware works fine, except for the slow RAID
> of course.
>
> I still have the main problem I try to get to the bottom off, and that
> is that the RAID-1 volume da0 is very slow.
> - Slow with even just 1 disk.
> - Slow when sync completed or not.
> Without RAID configured , and having 2 disks mounted, the disks are fast
> ~ 30 Mbytes/sec
> The disks are Fujitsu SATA laptop drives.

Integrated Mirroring has always been a problem. For parallel SCSI, you
have to negotiate with the physical drives themselves.

This *shouldn't* be an issue with SAS, but you never know.

>
> I was poking around the MPI libraries of Linux, and I see they have some
> extra entries related to SAS.
> Also the file mptsas.c in Linux sets up the link speed and so on on the
> PHY.
> Do not know if something there is needed yet.
>
> Any idea of where I can start looking for the problem ?
> - link speed
> - dma
> - caching
> - etc ..etc ..
>

Don't know yet. The RAID stuff for mpt was written solely for SPI.
It's a miracle it works at all for SAS or FC. I have a sunfire4100 on
loan which supports this and when I have a spare moment (hah) I'll
look into it.