On Thu, May 24, 2007 at 11:55:58AM -0700, Grant Kelly wrote: > I'm running SunOS Release 5.10 Version Generic_118855-36 64-bit > and in [b]/etc/system[/b] I put: > > [b]set zfs:zfs_nocacheflush = 1[/b] > > And after rebooting, I get the message: > > [b]sorry, variable 'zfs_nocacheflush' is not defined in the 'zfs' module[/b] > > So is this variable not available in the Solaris kernel?
I think zfs:zfs_nocacheflush is only available in Nevada. > I'm getting really poor write performance with ZFS on a RAID5 volume > (5 disks) from a storagetek 6140 array. I've searched the web and > these forums and it seems that this zfs_nocacheflush option is the > solution, but I'm open to others as well. What type of poor performance? Is it because of ZFS? You can test this by creating a RAID-5 volume on the 6140, creating a UFS file system on it, and then comparing performance with what you get against ZFS. It would also be worthwhile doing something like the following to determine the max throughput the H/W RAID is giving you: # time dd of=<raw disk> if=/dev/zero bs=1048576 count=1000 For a 2Gbps 6140 with 300GB/10K drives, we get ~46MB/s on a single-drive RAID-0 array, ~83MB/s on a 4-disk RAID-0 array w/128k stripe, and ~69MB/s on a seven-disk RAID-5 array w/128k strip. -- albert chin ([EMAIL PROTECTED]) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
