Hmm -- I would assume it's the same.

 

15K rpm disks is rated around 160 IOPS, 10K @ 120 IOPS, and 7200 @ 80 IOPS.

 

NTAP claims there is only a 3% decrease in performance when writing to DP vs RAID-4.

 

So I would calculate the IOPS x # of disks and then take 3% off.

 

 

On 10/4/06, Suresh Rajagopalan <SRajagopalan@williamoneil.com> wrote:

Given a disk IOPS of 100, I'd like to estimate total aggregate IOPS for
the following cases:

1) 56 disks, 1 aggregate, RAID-DP size 16
2) 112 disks, 1 aggregate, RAID-DP size 16

I'm only interested in the total raw disk IOPS available in each case,
not including considering the filer head.     For example, we know that
RAID-0 with 56 disks @100 would yield 5600 IOPS.

I don't know how to do this calculation with Data ONTAP's implementation
of RAID4 or RAID-DP.

Any assistance would help.

Thanks
Suresh