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RE: NAS Build 2019 Step 10 - Introduction to ZFS
Just out of my experience:
Don't do compression, when expecting lots of IO.
This can screw vms and applications, without even recognising the bottleneck in the first place.
Dev pointing at vm team, vm team pointing at storage guys, storage guys pointing back at devs:))
ZFS compression is amazing, in fact, it increases performance significantly as it reduces the amount of disk IO to slow platters.
ZFS compression is intelligent (will short circuit when it finds uncompressible media), completely transparent, and almost every scenario increases performance.
The only time ZFS will give you a problem is when you have heavily CPU bound processes running on the same cores as ZFS.