[CentOS] LSI 2008 SAS driver?

Tony Mountifield tony at softins.co.uk
Fri Mar 23 13:05:08 EDT 2012


In article <4F6C9123.2000800 at hogranch.com>,
John R Pierce <pierce at hogranch.com> wrote:
> On 03/23/12 5:04 AM, Tony Mountifield wrote:
> > Can anyone tell me which versions of CentOS/kernel support the LSI 2008
> > SAS chipset, as used in the Supermicro X8DT6-F motherboard?
> >
> > It's billed as a "hardware RAID" controller. Is this real RAID or fake RAID?
> > I will be having two hard drives in a mirrored configuration. I usually
> > use MD software RAID1, mirroring at the partition level. Would this still
> > be best with this chipset, or would hardware RAID1 mirroring be better?
> 
> the MPT2SAS driver for those chips should be in c5.recent and most 
> definitely are in C6
> 
> its 'real' hardware reid, but doesn't have significant cache or any 
> battery or flash backup, so its hardly worth using the raid.  I 
> configure these as simple JBOD and let Linux do the mirroring.

Thanks, that's what I thought.

Would I see much difference in performance or CPU load between SAS
and SATA disks of the same geometry and RPM speed? Such as Seagate
Constellation drives, which are available in SAS or SATA.

Cheers
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org


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