On Fri, 13 Nov 2009, inouk wrote:
So my question are the following: 1.- Why zpool iostat is reporting 15MB/s of data read when in reality only 615KB/s is read ? 2.- Why sched is taking so much io? 3.- What I can do to improve IO performance? It find it very unbelievable that this is the best performance the current hardware can provide...
Your system has every little RAM (512MB). It is less than is recommended for Solaris 10 or for zfs and if it was a PC, it would be barely enough to run Windows XP. Since zfs likes to use RAM and expects and sufficient RAM will be available, it seems likely that this system is both paging badly, and is also not succeeding to cache enough data to operate efficiently. Zfs is re-reading from disk where normally the data would be cached.
The simple solution is to install a lot more RAM. 2GB is a good starting point.
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
