This content has been marked as final. Show 3 replies
If your filesystem is populated with more than 80%, then the performance can be drastically decrease. Please try to increase filesystem size to become less that 80%. Several options are available with zfs command to force ZFS filesystem size or to have an minimal size.
More details there : https://blogs.oracle.com/cshu/entry/tuning_tips_for_zfs_with_ibm_db2
Utilization isn't a big deal as long as your average service times don't go up and you don't have a lot of requests sitting in queue. I think this is the best part of zfs, that you can keep that many disks consistently busy.