On Wed, Feb 10, 2010 at 3:12 PM, Marc Nicholas <geekyth...@gmail.com> wrote: > How does lowering the flush interval help? If he can't ingress data > fast enough, faster flushing is a Bad Thibg(tm). > > -marc > > On 2/10/10, Kjetil Torgrim Homme <kjeti...@linpro.no> wrote: >> Bob Friesenhahn <bfrie...@simple.dallas.tx.us> writes: >>> On Wed, 10 Feb 2010, Frank Cusack wrote: >>> >>> The other three commonly mentioned issues are: >>> >>> - Disable the naggle algorithm on the windows clients. >> >> for iSCSI? shouldn't be necessary. >> >>> - Set the volume block size so that it matches the client filesystem >>> block size (default is 128K!). >> >> default for a zvol is 8 KiB. >> >>> - Check for an abnormally slow disk drive using 'iostat -xe'. >> >> his problem is "lazy" ZFS, notice how it gathers up data for 15 seconds >> before flushing the data to disk. tweaking the flush interval down >> might help. >> >>>> An "iostat -xndz 1" readout of the "%b% coloum during a file copy to >>>> the LUN shows maybe 10-15 seconds of %b at 0 for all disks, then 1-2 >>>> seconds of 100, and repeats. >> >> what are the other values? ie., number of ops and actual amount of data >> read/written. >> >> -- >> Kjetil T. Homme >> Redpill Linpro AS - Changing the game >> >> _______________________________________________ >> zfs-discuss mailing list >> zfs-discuss@opensolaris.org >> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >> > > -- > Sent from my mobile device > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >
ZIL performance issues? Is writecache enabled on the LUNs? -- Brent Jones br...@servuhome.net _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
