Pascal Vandeputte <pascal_vdp <at> hotmail.com> writes: > > I'm at a loss, I'm thinking about just settling for the 20MB/s write > speeds with a 3-drive raidz and enjoy life...
As Richard Elling pointed out, the ~10ms per IO operation implies seeking, or hardware/firmware problems. The mere fact you observed a low 27 MB/s sequential write throughput on c1t0d0s0 indicates this is not a ZFS pb. Test other disks, another SATA controller, mobo, BIOS/firmware, etc. As you pointed out, these disks should normally be capable of a 80-90 MB/s write throughput. Like you I would also expect ~100 MB/s writes on a 3-drive raidz pool. As a datapoint, I see 150 MB/s writes on a 4-drive raidz on a similar config (750GB SATA Samsung HD753LJ disks, SB600 AHCI controller, low-end CPU). -marc _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
