Steve,
Mixing drives in the way you expanded your aggregate is perfectly fine. If anything, you've added raid groups that have a better performance footprint, so you may see an overall increase in performance as WAFL writes across raidgroups during CPs.
The performance issues you mentioned would come from adding a slower drive to a RG with faster drives - thus bringing down the overall performance (this is not the case in your situation).
You should attempt to keep one spare of each drive type if at all possible, but ONTAP will select a drive of lesser speed if no other spare is available.
Summary: The thing to avoid here is adding slower drives to raid groups with faster drives, or allowing a failed drive to rebuild on a drive with a slower speed thus bringing down the overall performance of the RG\AGGR.
Glenn
-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Stephen C. Losen Sent: Tuesday, July 11, 2006 6:11 PM To: toasters@mathworks.com Subject: mixing disk RPMs in aggregate?
We just bought two new shelves of ATA drives to enlarge an aggregate on our R200 and the new drives are all 7200 RPM while the old drives are 5400 RPM, same size though.
It looks like ONTAP will let me add the new disks to the aggregate if I use the -f (force) flag. I'm inclined to force, unless this ruin performance or make the filer crash.
We keep two hot spares, so should I have one of each RPM?
Steve Losen scl@virginia.edu phone: 434-924-0640
University of Virginia ITC Unix Support
NetApp is sending 7200 RPM disks as a spare when the 5400RPM disks die. Just FYI.
-Blake
On 7/11/06, Glenn Walker ggwalker@mindspring.com wrote:
Steve,
Mixing drives in the way you expanded your aggregate is perfectly fine. If anything, you've added raid groups that have a better performance footprint, so you may see an overall increase in performance as WAFL writes across raidgroups during CPs.
The performance issues you mentioned would come from adding a slower drive to a RG with faster drives - thus bringing down the overall performance (this is not the case in your situation).
You should attempt to keep one spare of each drive type if at all possible, but ONTAP will select a drive of lesser speed if no other spare is available.
Summary: The thing to avoid here is adding slower drives to raid groups with faster drives, or allowing a failed drive to rebuild on a drive with a slower speed thus bringing down the overall performance of the RG\AGGR.
Glenn
-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Stephen C. Losen Sent: Tuesday, July 11, 2006 6:11 PM To: toasters@mathworks.com Subject: mixing disk RPMs in aggregate?
We just bought two new shelves of ATA drives to enlarge an aggregate on our R200 and the new drives are all 7200 RPM while the old drives are 5400 RPM, same size though.
It looks like ONTAP will let me add the new disks to the aggregate if I use the -f (force) flag. I'm inclined to force, unless this ruin performance or make the filer crash.
We keep two hot spares, so should I have one of each RPM?
Steve Losen scl@virginia.edu phone: 434-924-0640
University of Virginia ITC Unix Support
-
Blake Golliher -
Glenn Walker