Date: Tue, 8 Mar 2011 12:26:49 +0100 From: "Patrick M. Hausen" <hausen@punkt.de> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: ZFS performance as the FS fills up? Message-ID: <BD2C8439-AC1E-49CB-ABE2-9F7F0B292933@punkt.de>
next in thread | raw e-mail | index | archive | help
Hi, all, we use a big JBOD and ZFS with raidz2 as the target for our nightly Amanda backups. I already suspected that the fact that the FS was > 90% full might be the cause of our backup performance continously decreasing. I just added another vdev - 6 disks of 750 GB each, raidz2 and the FS usage is back to 71% currently. This was while backups were running and write performance instantly skyrocketed compared to the values before. So, is it possible to name a reasonable amount of free space to keep on a raidz2 volume? On last year's EuroBSDCon I got the impression that with recent (RELENG_8) ZFS merges I could get away with using around 90%. Thanks, Patrick --=20 punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe Tel. 0721 9109 0 * Fax 0721 9109 100 info@punkt.de http://www.punkt.de Gf: J=FCrgen Egeling AG Mannheim 108285
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?BD2C8439-AC1E-49CB-ABE2-9F7F0B292933>