Slow RAID IO on PE2970

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

On Fri, Mar 13, 2009 at 10:27 AM, John LLOYD <jal at> 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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