On 10/24/2013 1:41 PM, Lists wrote: > Was wondering if anybody here could weigh in with real-life experience? > Performance/scalability? I've only used ZFS on Solaris and FreeBSD. some general observations... 1) you need a LOT of ram for decent performance on large zpools. 1GB ram above your basic system/application requirements per terabyte of zpool is not unreasonable. 2) don't go overboard with snapshots. a few 100 are probably OK, but 1000s (*) will really drag down the performance of operations that enumerate file systems. 3) NEVER let a zpool fill up above about 70% full, or the performance really goes downhill. 4) I prefer using striped mirrors (aka raid10) over raidz/z2, but my applications are primarily database. (*) ran into a guy who had 100s of zfs 'file systems' (mount points), per user home directories, and was doing nightly snapshots going back several years, and his zfs commands were taking a long long time to do anything, and he couldn't figure out why. I think he had over 10,000 filesystems * snapshots. -- john r pierce 37N 122W somewhere on the middle of the left coast