questions about a PERC in a 2950

Patrick_Boyd at Patrick_Boyd at
Tue Oct 16 11:51:12 CDT 2007

The PERC is a FRU.

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.

-----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 

If I build drives as single-drive raid0 units and put filesystems on
then swap out the PERC controller for a SAS 5i controller, will the SAS
read the drives ok, or does the PERC allocate space on the drive in a
that will break things when switching over to the SAS 5i?


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
> 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
> 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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