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Date:      Tue, 20 Jan 2009 22:17:47 -0600
From:      Dan Nelson <>
To:        Geoff Fritz <>
Subject:   Re: Way to prune/limit the ZFS zpool history?
Message-ID:  <>
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 , 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

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