Mickae?l ABISROR wrote: >>> Hi all, >>> >>> here are some questions about ZFS >>> >>> When accessing to RAW volumes under ZFS do we go through cache or >>> not? If yes can we disable it? >>>
I believe Zvols are uncached. >>> They use Veritas QuickIO (ODM) and they want to compare with ZFS and >>> also ZFS with and without cache. >>> Please see the discussions on "directio" at http://www.solarisinternals.com//wiki/index.php?title=Category:ZFS http://blogs.sun.com/bobs/entry/one_i_o_two_i http://blogs.sun.com/bobs/entry/oracle_i_o_supply_and http://www.solarisinternals.com/wiki/index.php/Direct_I/O >>> Do we have some benchmark or figures about the compression CPU >>> overhead with ZFS? and for Checksumming? >>> >>> I've seen 1ghz/500mbytes of data for checksumming but it seems to me >>> that's huge... >>> I believe you mean 1 GHz/500 MBytes/s which is reasonable. That is a rather substantial bandwidth for database. >> What about also the update of ZFS? Do we update with packages, >> patches, kernel patches or Solaris release? >> Yes. The exact mix depends on your OS and release. -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
