FBSD 10, zfs, can't find mountpoint for /usr
Mike Tancsa
mike at sentex.net
Wed Nov 12 18:08:52 UTC 2014
On 11/12/2014 12:28 PM, Gene wrote:
> OK - so on the older system, if I wanted to take a snapshot of, say /usr/
> local/etc, I would have to snapshot /usr (/usr being the upstream
> mountpoint).
Yes, you would typically do a UFS snapshot like that.
> So now, if I want a similar snapshot of /usr/local/etc, any idea
> what the path would be? Can't do /usr, it's no longer a mountpoint.
> Ditto /usr/local. Snapshoting "/" maybe? Would that no longer capture the
> entire pool? Hmmmm....
Yes, it would indeed be /
ZFS snapshots are VERY efficient and fast. So dont worry about the space
they take. If just a few MB changed, the space it takes to keep that
snapshot wont be much bigger than the few MB. Here is one of my servers
with a default install and daily snapshots. As you can see, / does not
register as it doesnt get updated that often. /var does, which makes
sense due to the logs. But even there, it seems quite efficient and
economical.
# zfs list zroot
NAME USED AVAIL REFER MOUNTPOINT
zroot 7.24G 88.7G 96K none
# zfs list -t snapshot
NAME USED AVAIL REFER MOUNTPOINT
zroot at prev-1 0 - 96K -
zroot at 5 0 - 96K -
zroot at 6 0 - 96K -
zroot at 0 0 - 96K -
zroot at 1 0 - 96K -
zroot at 2 0 - 96K -
zroot at 3 0 - 96K -
zroot at 4 0 - 96K -
zroot/ROOT at prev-1 0 - 96K -
zroot/ROOT at 5 0 - 96K -
zroot/ROOT at 6 0 - 96K -
zroot/ROOT at 0 0 - 96K -
zroot/ROOT at 1 0 - 96K -
zroot/ROOT at 2 0 - 96K -
zroot/ROOT at 3 0 - 96K -
zroot/ROOT at 4 0 - 96K -
zroot/ROOT/default at prev-1 280K - 4.08G -
zroot/ROOT/default at 5 0 - 4.08G -
zroot/ROOT/default at 6 0 - 4.08G -
zroot/ROOT/default at 0 10.2M - 4.08G -
zroot/ROOT/default at 1 9.53M - 4.08G -
zroot/ROOT/default at 2 9.96M - 4.08G -
zroot/ROOT/default at 3 11.9M - 4.08G -
zroot/ROOT/default at 4 1.71M - 4.09G -
zroot/tmp at prev-1 324K - 25.9M -
zroot/tmp at 5 0 - 25.9M -
zroot/tmp at 6 0 - 25.9M -
zroot/tmp at 0 324K - 25.8M -
zroot/tmp at 1 324K - 25.8M -
zroot/tmp at 2 324K - 25.8M -
zroot/tmp at 3 636K - 25.8M -
zroot/tmp at 4 652K - 25.9M -
zroot/usr at prev-1 0 - 96K -
zroot/usr at 5 0 - 96K -
zroot/usr at 6 0 - 96K -
zroot/usr at 0 0 - 96K -
zroot/usr at 1 0 - 96K -
zroot/usr at 2 0 - 96K -
zroot/usr at 3 0 - 96K -
zroot/usr at 4 0 - 96K -
zroot/usr/home at prev-1 0 - 213M -
zroot/usr/home at 5 0 - 213M -
zroot/usr/home at 6 0 - 213M -
zroot/usr/home at 0 0 - 213M -
zroot/usr/home at 1 0 - 213M -
zroot/usr/home at 2 0 - 213M -
zroot/usr/home at 3 84K - 213M -
zroot/usr/home at 4 96K - 213M -
zroot/usr/ports at prev-1 0 - 1.66G -
zroot/usr/ports at 5 0 - 1.66G -
zroot/usr/ports at 6 0 - 1.66G -
zroot/usr/ports at 0 0 - 1.66G -
zroot/usr/ports at 1 0 - 1.66G -
zroot/usr/ports at 2 0 - 1.66G -
zroot/usr/ports at 3 0 - 1.66G -
zroot/usr/ports at 4 224K - 1.66G -
zroot/usr/src at prev-1 0 - 1.02G -
zroot/usr/src at 5 0 - 1.02G -
zroot/usr/src at 6 0 - 1.02G -
zroot/usr/src at 0 0 - 1.02G -
zroot/usr/src at 1 0 - 1.02G -
zroot/usr/src at 2 0 - 1.02G -
zroot/usr/src at 3 0 - 1.02G -
zroot/usr/src at 4 0 - 1.02G -
zroot/var at prev-1 0 - 96K -
zroot/var at 5 0 - 96K -
zroot/var at 6 0 - 96K -
zroot/var at 0 0 - 96K -
zroot/var at 1 0 - 96K -
zroot/var at 2 0 - 96K -
zroot/var at 3 0 - 96K -
zroot/var at 4 0 - 96K -
zroot/var/crash at prev-1 0 - 96K -
zroot/var/crash at 5 0 - 96K -
zroot/var/crash at 6 0 - 96K -
zroot/var/crash at 0 0 - 96K -
zroot/var/crash at 1 0 - 96K -
zroot/var/crash at 2 0 - 96K -
zroot/var/crash at 3 0 - 96K -
zroot/var/crash at 4 0 - 96K -
zroot/var/log at prev-1 304K - 10.4M -
zroot/var/log at 5 156K - 10.8M -
zroot/var/log at 6 92K - 10.8M -
zroot/var/log at 0 3.07M - 12.5M -
zroot/var/log at 1 2.11M - 12.0M -
zroot/var/log at 2 5.49M - 14.0M -
zroot/var/log at 3 5.25M - 14.9M -
zroot/var/log at 4 2.09M - 15.6M -
zroot/var/mail at prev-1 0 - 520K -
zroot/var/mail at 5 0 - 520K -
zroot/var/mail at 6 0 - 520K -
zroot/var/mail at 0 116K - 536K -
zroot/var/mail at 1 128K - 548K -
zroot/var/mail at 2 108K - 560K -
zroot/var/mail at 3 108K - 560K -
zroot/var/mail at 4 116K - 568K -
zroot/var/tmp at prev-1 64K - 104K -
zroot/var/tmp at 5 0 - 104K -
zroot/var/tmp at 6 0 - 104K -
zroot/var/tmp at 0 0 - 104K -
zroot/var/tmp at 1 0 - 104K -
zroot/var/tmp at 2 64K - 104K -
zroot/var/tmp at 3 64K - 104K -
zroot/var/tmp at 4 64K - 104K -
---Mike
--
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike at sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada http://www.tancsa.com/
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