ZFS and "internal" mfi RAID cards, the eternal question

[Josh Paetzel]

On Friday, January 14, 2011 08:03:01 am Peter Lai wrote:
> On Fri, Jan 14, 2011 at 6:44 AM, Borja Marcos <borjam at sarenet.es> wrote:
> > On Jan 14, 2011, at 12:50 PM, Peter Lai wrote:
> >> Is there a reason you are ordering your Dells with H700 instead of
> >> H200; do you really want the battery backed cache anyway?
> >> http://www.dell.com/content/topics/topic.aspx/global/products/pvaul/topi
> >> cs/en/us/raid_controller?c=us&l=en&cs=555 suggests the H200 has jbod
> >> mode...
> > 
> > Indeed, it doesn't work under FreeBSD. Or am I wrong?
> 
> Good point. My guess here is that as an LSI card, it's not really
> supposed be picked up by mfi, but mpt. But most of my experience with
> dell has been to not even bother with the addon raid and just stick
> with the mpt controllers.  Of course, they only support up to 8 disks,
> so if you need more than that...well :(

The H200 is a 6 gbps LSI SAS HBA under the hood that is not supported by mpt.  
There is a new driver in HEAD called mps that supports the card.  People have 
had varying amounts of success running the driver ported to 8.x.  I can 
provide you with a .ko that works on 8.x, but it comes with a YMMV warranty.

FWIW, this driver won't be appearing in 8.2 due to various concerns the people 
working on it had with it.

-- 
Thanks,

Josh Paetzel
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