Slow RAID IO on PE2970

Todd Lyons tlyons at ivenue.com
Sun Mar 15 18:42:57 CDT 2009


On Fri, Mar 13, 2009 at 10:27 AM, John LLOYD <jal at mdacorporation.com> wrote:
>> How much performance would we get by moving to SAS drives and
>> could the Perc5i have 2 arrays of 1 SATA and 1 SAS (all
>> internal drives) as we're unsure if can have mixed array types?
>>
>
> Yes we have successfully mixed SAS and SATA on the same PERC5 (and
> PERC6).  It is supported, although you cannot order a server that way
> from Dell you can add disks later.
>
> For us the 15k rpm SAS disks are noticeably faster.  But you can't get
> 1TB SAS disks, so eventually you have to decide if you need speed over
> capacity.

This might be the unpopular answer, but if the goal is lots of SATA
drives, a good ole-fashioned 3Ware SATA RAID controller has
outperformed everything else SATA for us.

-- 
Regards...      Todd
All truth passes through three stages. First, it is ridiculed. Second,
it is violently opposed. Third, it is accepted as being self-evident.



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