From: Ulli Horlacher <framstag@rus.uni-stuttgart.de>
To: linux-btrfs@vger.kernel.org
Subject: snapshots of subvolumes recursivly?
Date: Sun, 12 May 2024 22:39:21 +0200 [thread overview]
Message-ID: <20240512203921.GA83909@tik.uni-stuttgart.de> (raw)
I have asked a similar question 2019-07-05, but maybe meanwhile there is a
solution...
I want to backup btrfs filesystems with IBM Spectrum Protect and restic,
both are file based.
Copying files which are in write-open state will lead to file corruption.
Therefore my idea is: create a snapshot and run the backup on the snapshot.
The problem now is: some of the btrfs filesystems have subvolumes and
even sub-subvolumes.
When I create a snapshot it does not contain subvolumes. Example:
root@fex:/local/test# btrfs subvolume list .
ID 350 gen 6075947 top level 5 path home
ID 62530 gen 6075904 top level 5 path test
ID 62531 gen 6075894 top level 62530 path sv1
ID 62532 gen 6075895 top level 62530 path sv2
ID 62533 gen 6075894 top level 62531 path sv1/sv1_1
ID 62534 gen 6075894 top level 62531 path sv1/sv1_2
root@fex:/local/test# ll -R
drwxr-xr-x root root - 2024-05-12 20:42:02 sv1
drwxr-xr-x root root - 2024-05-12 20:42:10 sv1/sv1_1
-rw-r--r-- root root 20 2024-05-12 20:42:10 sv1/sv1_1/zz
drwxr-xr-x root root - 2024-05-12 20:42:17 sv1/sv1_2
-rw-r--r-- root root 20 2024-05-12 20:42:17 sv1/sv1_2/zz
-rw-r--r-- root root 20 2024-05-12 20:42:02 sv1/zz
drwxr-xr-x root root - 2024-05-12 20:42:25 sv2
-rw-r--r-- root root 20 2024-05-12 20:42:25 sv2/zz
-rw-r--r-- root root 20 2024-05-12 20:40:58 zz
root@fex:/local/test# btrfs sub snap . backup
Create a snapshot of '.' in './backup'
root@fex:/local/test# ll -R backup
drwxr-xr-x root root - 2024-05-12 20:40:58 backup
drwxr-xr-x root root - 2024-05-12 20:47:58 backup/sv1
drwxr-xr-x root root - 2024-05-12 20:47:58 backup/sv2
-rw-r--r-- root root 20 2024-05-12 20:40:58 backup/zz
root@fex:/local/test# btrfs subvolume list .
ID 350 gen 6075947 top level 5 path home
ID 62530 gen 6075904 top level 5 path test
ID 62531 gen 6075894 top level 62530 path sv1
ID 62532 gen 6075895 top level 62530 path sv2
ID 62533 gen 6075894 top level 62531 path sv1/sv1_1
ID 62534 gen 6075894 top level 62531 path sv1/sv1_2
ID 62535 gen 6075903 top level 62530 path backup
As you see: the snapshot /local/test/backup does not contain the sv*
subvolumes, only empty directories backup/sv1 backup/sv2
I could write a script which creates snapshots of the subvolumes
(recursivly), but maybe there is already such a program?
Or another solution for this problem?
--
Ullrich Horlacher Server und Virtualisierung
Rechenzentrum TIK
Universitaet Stuttgart E-Mail: horlacher@tik.uni-stuttgart.de
Allmandring 30a Tel: ++49-711-68565868
70569 Stuttgart (Germany) WWW: https://www.tik.uni-stuttgart.de/
REF:<20240512203921.GA83909@tik.uni-stuttgart.de>
next reply other threads:[~2024-05-12 20:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-12 20:39 Ulli Horlacher [this message]
2024-05-13 4:19 ` snapshots of subvolumes recursivly? HAN Yuwei
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