03-11-2020
Two more comments on zfs:
- Don't fill up the filesystems
If you fill up zfs file systems above 80%, performance will degrade.
- No manual balancing method available
If you have a Volume with more than one vdev and they are not equally full performance also degrades. For best performance vdev utilization should be equal of every vdev. But there are times when vdev utilization is completely different. For example if you add a new vdev: The new vdev will be empty. There are 2 typical ways to solve that:- utilization will slowly level to the pool average over time
The percentage of the probability for a vdev to be the targe for a new write is the reversed percentage of the utilization of that vdev. So the least filled up vdev will get more new data as the other ones and the vdev utilization will average with writes and deletes over time.
- export and import the zfs pool
If you like to have it immediately, you may export and import the pool. That way on the import all data will be distributed evenly over all vdevs. That task of course needs a lot of temporary space and probably time when you have quite some TB of data.
Regarding the performance of filesystems, I'm interested in it quite much. Right now, I'm writing benchmark scripts testing different aspects of it and will open a thread here soon.
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