Sizing tips for a new FAS 2820 with disk shelves

alessice — Fri, 07 Mar 2025 14:55:04 GMT

Hi,

I need advice on a new FAS to buy. We currently have a FAS 2720 configured as follows

4x960GB + 8x4TB + 3xDS212C 12x4TB

with two aggregates of about 50TB each and Flash Pool.

We use it to store customer emails, these are many small files accessed rarely but with a lot of use of metadata (for this reason Flash Pool helps us a lot), the IOPS at peak times reach 20,000 in total.

We need a second FAS and the options we are evaluating are these:

FAS2820A 4x960GB + 8x10TB + 4xDS212C 12x10TB: configuration with 10TB disks and an extra DS, I would have much more space but I think I would not be able to use it due to the IOPS limit. I did some simulations and the higher cost is only worth it if I can occupy more than double the space and therefore do double the IOPS of the current FAS 2720.
FAS2820A 4x960GB + 8x4TB + 4xDS212C 12x4TB: configuration with an extra DS but would it be safe to continue doing RAID-DP with this number of disks? I would like to continue having 2 aggregates.
FAS2820A 4x960GB + 8x4TB + 3xDS212C 12x4TB: configuration similar to the one we already have

I did some simulations with Fusion to estimate the number of IOPS I could reach but according to Fusion it is not even possible to do the IOPS that I actually do now, so my workload is not well simulated.

I would like to have your advice.
Thanks

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Sizing tips for a new FAS 2820 with disk shelves