On Tue, August 10, 2010 4:06 pm, Gary Mills wrote: > On Mon, Aug 09, 2010 at 09:03:44PM +0200, Pascal Gienger wrote: > >> Am 09.08.10 19:46, schrieb Vincent Fox: >> >>> * Turn off ZFS cache flushing >>> set zfs:zfs_nocacheflush = 1 >> >> For hardware (fiberchannel, iSCSI, SSA, ...) arrays with their own Cache >> this is a must. > > Only if the SAN device handles cache flush requests incorrectly. > It should consider a write to battery-backed memory as a write to > permanent storage, and manage its own writes to disk from there. Folks, Be aware that the zfs_nocacheflush parameter is global and thus applies to all ZFS filesystems on your server, local (system) disks included ... http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Cache_Flushes offers extra reading material. Pascal, Vincent and Gary, I have been ploughing your valuable comments back into our development team's discussions ! Thank you. Eric Luyten. ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
