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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