Freenas Copy-On-Write not working

Server
1

Hello,

I’m running Urbackup in a Freenas Jail. I’ve installed Urbackup as descrobed here: https://www.urbackup.org/freenasserverinstall.html

Further I set the following sysctl’s in the Jail options:
enforce_statfs=1,allow.mount=1,allow.mount.zfs=1,allow.raw_sockets=1
With this options is possible to map a ZFS Volume into the Jail and to create/delete dataset in the Jail.

I’ve used on the Freenas host the following commands to map a ZFS dataset into the Jail:
zfs set jailed=on u01/u/01 #Allow ZFS operations in Jail
zfs jail ub01 u01/u/01 #Present ZFS Dataset to Jail
jexec ub01 zfs mount u01/u/01 #mount Dataset in Jail

urbackup_snapshot_helper gives:
root@ub01:~ # urbackup_snapshot_helper test
Testing for btrfs…
TEST FAILED: Creating test btrfs subvolume failed
Testing for zfs…
ZFS TEST OK

The problem: If i try to run a Full Image Backup for host test003 I’m getting a error.
2018-05-25 12:18:39: ERROR: Could rename symlink at /mnt/u01/u/01/test003/180525-1218_Image_SYSVOL_new to /mnt/u01/u/01/test003/180525-1218_Image_SYSVOL. Is a directory (code: 21)
2018-05-25 12:18:39: ERROR: Error creating image backup destination.

How can i fix this problem?
Maybe the rename is not working because already a dataset with the destination name exists?

Logfile and Console output is attached.logfile_and_console.txt (2.4 KB)

2

Hello Matthias,
if you are trying this with the old warden jail than have a look at my post
Freenas COW with different datasets

3

Make sure you are using different datasets for image backups, file backups and for the backup folder (backup folder only has symlinks to datasets).

4

Hint:
keep the paths as short as possible!

5

Hello uroni,
hello cellardoor,

thanks for your answers! It worked with cellardoor’s Post!