muchas gracias por vuestro tiempo, por que me hiciste mas fuerte [if misleading, plz excuse my french...] ;-) z
----- Original Message ----- From: "Bob Friesenhahn" <bfrie...@simple.dallas.tx.us> To: "Dmitry Razguliaev" <rdmitry0...@yandex.ru> Cc: <zfs-discuss@opensolaris.org> Sent: Saturday, January 10, 2009 10:28 AM Subject: Re: [zfs-discuss] ZFS poor performance on Areca 1231ML > On Sat, 10 Jan 2009, Dmitry Razguliaev wrote: > >> At the time of writing that post, no, I didn't run zpool iostat -v >> 1. However, I run it after that. Results for operations of iostat >> command has changed from 1 for every device in raidz to something in >> between 20 and 400 for raidz volume and from 3 to something in >> between 200 and 450 for a single device zfs volume, but the final >> result remained the same: single disk zfs volume is only about twice >> slower, then 9 disks raidz zfs volume, which seems to be very >> strange. My expectations are in a range of 6-7 times difference in >> performance. > > Your expectations were wrong. Raidz and raidz2 will improve bulk > sequential read/write with large files but they do nothing useful for > random access or multi-user performance. There is also the issue that > a single slow disk in a raidz or raidz2 vdev and drag down the > performance of the whole vdev. > > 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 _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
