Date: Tue, 20 Jan 2009 21:41:18 -0700 From: Geoff Fritz <gfritz@gmail.com> To: Dan Nelson <dnelson@allantgroup.com> Cc: Geoff Fritz <gfritz@gmail.com>, freebsd-questions@freebsd.org Subject: Re: Way to prune/limit the ZFS zpool history? Message-ID: <20090121044118.GC30866@dev.null> In-Reply-To: <20090121041747.GD45931@dan.emsphone.com> References: <20090120235256.GB30866@dev.null> <20090121041747.GD45931@dan.emsphone.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, Jan 20, 2009 at 10:17:47PM -0600, Dan Nelson wrote: > In the last episode (Jan 20), Geoff Fritz said: > > I've been experimenting with a series scripts that takes ZFS > > snapshots every minute, eventually destroying the oldest so that only > > so many remain available for a given window of time. > > > > This may seem a trivial concern with hard drive sizes being what they > > are these days, but after running a "zpool history" I started > > thinking that a ZFS create and destroy being performed every minute > > would add up to a lot over the course of a few years (current > > estimate is 62MB/year for the naming scheme of my snapshots). > > According to > http://docs.sun.com/app/docs/doc/819-5461/gdswe?l=en&a=view , the zpool > history file is between 128K and 32MB, depending on the size of the > pool. The FreeBSD import at > /sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_history.c agrees > with the docs :) I always forget that ZFS is documented on Sun's site as well as the man pages. Hopefully some day the FreeBSD docs will catch up w/ Sun's. Thanks a bunch for the pointer. Very informative. -- Geoff
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090121044118.GC30866>