Date: Mon, 8 Dec 2014 20:19:02 +0100 From: Niklaas Baudet von Gersdorff <niklaas@kulturflatrate.net> To: freebsd-questions@freebsd.org Subject: ZFS "cannot open [...]: dataset does not exist" Message-ID: <20141208191902.GG31701@len-x61s.klaas>
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Dear Mailinglist,
I am currently using zfssnap.sh [1] to make a regular backup of
the entire ZFS pool on our server. In principal, this works great,
nevertheless, every time I am running the script I get the following
error:
cannot open 'tank/usr/ports': dataset does not exist
cannot open 'tank/usr/src': dataset does not exist
1: https://bitbucket.org/mmichele/zfssnap
I did some research on the net and I guess this is related to an already
asked question that has never been answered [2], to a bug whose record I
cannot find on the net [3] and a solution I do not completely understand
[4].
2: https://forums.freebsd.org/threads/spurious-zfs-dataset-does-not-exist-errors.19878/
3: https://lists.freebsd.org/pipermail/freebsd-fs/2010-December/010224.html
4: https://lists.freebsd.org/pipermail/freebsd-fs/2010-December/010225.html
Please have a look at [4] especially. It seems like there are certain
"state files" still existing. As far as I understand it, these state
files are responsible for ZFS looking for a dataset that actually does
not exist. Unfortunately, I cannot find anything under `/dev/` that I
might be able to delete. (There is `/dev/zfs/` which is not a directory
I can `cd` into.)
In case someone could hint me to these state files or any other tip is
very much appreciated.
$ zfs list
NAME USED AVAIL REFER MOUNTPOINT
tank 14.7G 1.68T 31K none
tank/jails 12.8G 1.68T 32K /usr/local/jails
tank/jails/ezjails 12.8G 1.68T 62K /usr/local/jails/ezjails
tank/jails/ezjails/basejail 2.41G 1.68T 1.63G /usr/local/jails/ezjails/basejail
tank/jails/ezjails/fulljail 31K 1.68T 31K /usr/local/jails/ezjails/fulljail
tank/jails/ezjails/[** censored ** ] 577M 1.68T 469M /usr/local/jails/ezjails/[** censored ** ]
tank/jails/ezjails/newjail 2.72M 1.68T 1.85M /usr/local/jails/ezjails/newjail
tank/jails/ezjails/[** censored ** ] 367M 1.68T 336M /usr/local/jails/ezjails/[** censored ** ]
tank/jails/ezjails/[** censored ** ] 9.51G 1.68T 7.85G /usr/local/jails/ezjails/[** censored ** ]
tank/root 1.78G 1.68T 974M /
tank/root/tmp 328K 1.68T 39K /tmp
tank/root/var 660M 1.68T 401M /var
$ uname -a
FreeBSD [** censored ** ] 10.0-RELEASE-p12 FreeBSD 10.0-RELEASE-p12 #0: Tue Nov 4 05:07:17 UTC 2014 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
Thank you and best,
--
Niklaas
Baudet von Gersdorff
niklaas@kulturflatrate.net
http://www.twitter.com/NBvGersdorff
http://www.kulturflatrate.net/niklaas
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