ZFS on Linux has improved a lot in the last few years. We (prematurely) moved to using it in production for our MySQL data about 5 years ago and initially it was a nightmare due to unexplained stalling which would hang MySQL for 15-30 minutes at random times. I'm sure it shortened my life a few years trying to figure out what was wrong when everything was on fire. Fortunately, they have resolved those issues in the subsequent releases and it's been much more pleasant after that.
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