Date: Tue, 20 Jan 2009 22:17:47 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Geoff Fritz <gfritz@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Way to prune/limit the ZFS zpool history? Message-ID: <20090121041747.GD45931@dan.emsphone.com> In-Reply-To: <20090120235256.GB30866@dev.null> References: <20090120235256.GB30866@dev.null>
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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 :) -- Dan Nelson dnelson@allantgroup.com
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