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Top Forums UNIX for Beginners Questions & Answers Should I use a CoW filesystem on my PC if I only wanted snapshot capabilities ? Post 303045038 by stomp on Wednesday 11th of March 2020 05:28:50 AM
Old 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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