On Jan 15, 2011, at 4:21 PM, Michael Armstrong wrote: > Hi guys, sorry in advance if this is somewhat a lowly question, I've recently > built a zfs test box based on nexentastor with 4x samsung 2tb drives > connected via SATA-II in a raidz1 configuration with dedup enabled > compression off and pool version 23. From running bonnie++ I get the > following results: > > Version 1.03b ------Sequential Output------ --Sequential Input- > --Random- > -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- > Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec > %CP > nexentastor 4G 60582 54 20502 4 12385 3 53901 57 105290 10 429.8 > 1 > ------Sequential Create------ --------Random Create-------- > -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- > files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP > 16 7181 29 +++++ +++ +++++ +++ 21477 97 +++++ +++ +++++ +++ > nexentastor,4G,60582,54,20502,4,12385,3,53901,57,105290,10,429.8,1,16,7181,29,+++++,+++,+++++,+++,21477,97,+++++,+++,+++++,+++ > > > I'd expect more than 105290K/s on a sequential read as a peak for a single > drive, let alone a striped set. The system has a relatively decent CPU, > however only 2GB memory, do you think increasing this to 4GB would noticeably > affect performance of my zpool? The memory is only DDR1.
2GB or 4GB of RAM + dedup is a recipe for pain. Do yourself a favor, turn off dedup and enable compression. -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
