Date: 15 Jun 2012 21:02:17 -0000 From: "John Levine" <johnl@iecc.com> To: freebsd-questions@freebsd.org Subject: Free space in ZFS Message-ID: <20120615210217.87837.qmail@joyce.lan>
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I made a three disk zraid ZFS pool yesterday from three new 1 TB disks, which I'm using for backup. Then I did a backup and made a zfs volume. The free space numbers don't make sense. This is on 8.3, ZFS version 15. # zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT backup2 2.72T 310G 2.42T 11% ONLINE - Given that it's zraid, the total available space should be a little under 2TB since the third disk is for parity. But zpool gives me a total of 2.72T, as though the third disk was for data. # zfs list NAME USED AVAIL REFER MOUNTPOINT backup2 206G 1.58T 31.3K /backup2 backup2/20120615 206G 1.58T 206G /backup2/20120615 Well, that makes more sense, total is 1.78Tb. # df -g Filesystem 1G-blocks Used Avail Capacity Mounted on backup2 1618 0 1618 0% /backup2 backup2/20120615 1825 206 1618 11% /backup2/20120615 Now the total is 1.82Tb. Huh? The backup filesystems are compressed, but surely they're showing me the actual size, not the uncompressed size. Or are they? R's, John
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