questions about a PERC in a 2950

Chris Stromsoe cbs at
Tue Oct 16 12:00:01 CDT 2007

On Tue, 16 Oct 2007, Patrick_Boyd at wrote:

> The PERC is a FRU.

Good to know.

> RAID 0's and SAS 5/I volumes are not really compatible, there is Disk 
> Data Format (DDF) data on the PERC created drives that I'm not really 
> sure how the SAS 5 would handle.

Ah.  That's unfortunate.  Good to know, though.


> -----Original Message-----
> From: Chris Stromsoe [mailto:cbs at]
> Sent: Tuesday, October 16, 2007 11:41 AM
> To: Boyd, Patrick
> Cc: linux-poweredge-Lists
> Subject: RE: questions about a PERC in a 2950
> Thanks.  Is that a field replaceable item?  I ordered a couple of 2950s 
> with SAS 5i controllers and got them delivered with PERC controllers 
> instead.
> If I build drives as single-drive raid0 units and put filesystems on 
> them, then swap out the PERC controller for a SAS 5i controller, will 
> the SAS 5i read the drives ok, or does the PERC allocate space on the 
> drive in a way that will break things when switching over to the SAS 5i?
> -Chris
> On Tue, 16 Oct 2007, Patrick_Boyd at wrote:
>> You have to remove the PERC and replace it with a SAS 5/i. There is 
>> only one of these controllers in the systems at a time.
>> -----Original Message-----
>> From: linux-poweredge-bounces at
>> [mailto:linux-poweredge-bounces at] On Behalf Of Chris Stromsoe
>> Sent: Monday, October 15, 2007 7:45 PM
>> To: linux-poweredge-Lists
>> Subject: questions about a PERC in a 2950
>> I have a couple of 2950s that have PERC controllers.  I'd like to 
>> disable the PERC controller and drop back to using the SAS 5i 
>> controller.  Is that possible / something that I can do in the field by 
>> fiddling with switches, or does it require parts replacement?  If it's 
>> not possible, is it possible to use the PERC as a straight SCSI 
>> controller, without having to make each drive into single disk raid0?
>> Thanks.
>> -Chris
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