Nathan Butcher <n-butcher_at_fusiongol.com> writes: > I've been having problems with my ZFS pool consisting of 4 drives hooked > up to my Prmoise SATA 300TX4 controller. It had been working fine until > to around the 19th of this month, and then I started seeing error > messages whenever I tried to write lots of data to ZFS..... followed by > a nasty lockup with no other debugging information of which to speak of. This is a recurring problem with ZFS and ata disks. It appears that the ata driver doesn't like the ATA_FLUSHCACHE command very much, and ZFS uses it a lot. Turning off atime helps, as does turning off ata write caching (hw.ata.wc=0 in loader.conf) - I still get timeouts and transient hangs once in a while, but my server no longer crashes: des_at_dwp ~% zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT raid 1.45T 298G 1.16T 20% ONLINE - des_at_dwp ~% uptime 6:09PM up 31 days, 5:02, 4 users, load averages: 0.95, 0.71, 0.66 DES -- Dag-Erling Smørgrav - des_at_des.noReceived on Mon Jul 02 2007 - 14:10:43 UTC
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