Agreed, but still: wy zpool iostat 15MB en iostat 615KB? Regard, Jeff ________________________________________ From: [email protected] [[email protected]] On Behalf Of Bob Friesenhahn [[email protected]] Sent: Friday, November 13, 2009 4:05 PM To: inouk Cc: [email protected] Subject: Re: [zfs-discuss] zfs/io performance on Netra X1
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 [email protected], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
