Re: Estimating Aggregate IOPS

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