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. > * Increase DNLC (Directory Name Lookup Cache) > set ncsize = 500000 vmstat -s | grep 'total name lookups' 135562914356 total name lookups (cache hits 96%) :-) Unless the percent ratio is not below 90% increasing the DNLC is not so useful. > Turn off atime of course. Sure. > Turn on LZJB compression for metapartition but gzip for > the mail data filesystem. Our compression ratio on the mail > filesystem is showing 1.68x. Yes. GZIP for Mail, LZJB for Meta. Identical configuration here. Pascal ---- 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
