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I think this link might help you calculate the IOPS for different type of disks. You haven't provided the type of disk (SATA, SAS, FC...) and so I cannot calculate the IOPS for you.
There wont be any specific answer that says it can give these many IOPS to answer your question directly. It depends on various criteria's. As a rule of thumb you can say a 15k FC drive can average between 150-190 IOPS.
Remember the IO penalty for RAID-DP is 2.
You can typically use the SAS figures for FC disks.
Every workload generates different usage patterns, which will be different IOPS figures. IOPS isn't a defined 'thing', so 1000 IOPS for one workload isn't the same as 1000 IOPS for a different workload. Is this all read, all write, some mix? The results will vary a lot.
The reason there isn't a simple figure that you can easily look up, is that there isn't a simple answer.
I work with a rule of thumb of about 2500 IOPS per SAS shelf of 24 disks, and about 1500 for a SATA shelf. A DS14 would be about half of this figure, as it has about half the usable disk count (depending on spares).
Is this a figure you would use as a starting guide to estimate a shelf count for a system? probably.
Is this a figure you would give to a customer as a guarantee and base your designs on it? I wouldn't.
Also keep in mind the huge effect of Flash Cache, Flash Pool and NVRAM in a NetApp. Disk IOPS aren't as important as many people think.