Edit*title was wrong, I meant zfs not nfs.... The io is local, tested with dd and iozone This is my first go with ZFS (usually an mdraid + lvm kinda guy), and i'm running into some performance issues. I've configured a pool consisting of 1 vdev of 8 disks (4tb sas 7.2k rpm) in raidz2. I'm expecting sequential disk read speeds of roughly 200MB x 8, ~1.6GB/s, and write speeds of 200MB x 6, ~1.2GB/s. However, in reality I'm getting reads ~550MB/s and writes ~220MB/s I disabled sync writes, and set the recordsize to 1M, which had only a slightly positive effect. Any suggestions?