On Wed, 17 Mar 2010, Kashif Mumtaz wrote:
but on UFS file system averge busy is 50% , any idea why ZFS makes disk more busy ?
Clearly there are many more reads per second occuring on the zfs filesystem than the ufs filesystem. Assuming that the application-level requests are really the same, this suggests that the system does not have enough RAM installed in order to cache the "working set". Another issue could be fileystem block size since zfs defaults the block size to 128K but some applications (e.g. database) work better with 4K, 8K, or 16K block size.
Regardless, I suggest measuring the statistics with a 30 second interval rather than 5 seconds since zfs is assured to do whatever it does within 30 seconds.
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
