On Tue, 24 Apr 2012, Trent W. Buck wrote:
Peter Ross wrote:
The zvol was never running out of disk space, just nearly 100% full. According to other discussions ZFS slows down if it is filling up. That would explain my problem.
IME, and according to #btrfs on freenode, that happens at about 80% full, IOW if you have a 2TB zpool its effective storage capacity is only 1.8TB, since after that it becomes unusably slow.
"Unusably" as in "it took me hours to delete a single 20MB daily snapshot, while the system was disconnected from the network entirely and all its other I/Oy processes were turned off."
Just now on the machine:
zpool list NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT zpool 912G 774G 138G 84% 1.00x ONLINE -
At the moment I don't see a performance problem. There are ca. 50 people connected to the mail server, it runs a MediaWiki, a PHP developer box, MySQL for it etc. It looks as I have to keep an eye on it. I mirror a samba server here, maybe I should do it on another box.. Regards Peter