[Gluster-users] Gluster USER SERVICEABLE SNAPSHOTS: Cannot see `.snaps` directory

samfisher1 samfisher1 at 126.com
Wed Dec 22 08:49:10 UTC 2021

It works. Thanks, Aravinda.
According to Red Hat's documentation, I can see the hidden folders by using ls -l command. It seems that this is different from the content in the Red Hat document. 

[root at pgsql-1 ~]# ls -la /mnt/glusterfs_disperse_vol_2/
... cannot see any hidden directory ...

[root at pgsql-1 ~]# ls -la /mnt/glusterfs_disperse_vol_2/.snaps_disperse_vol_2

total 40

drwxr-xr-x 3 root root 8192 Dec 20 20:28 snap_disperse_vol_2

drwxr-xr-x 3 root root 8192 Dec 20 20:28 snap_disperse_vol_2_2

drwxr-xr-x 3 root root 8192 Dec 21 15:37 snap_disperse_vol_2_3_GMT-2021.12.21-07.39.00

drwxr-xr-x 3 root root 8192 Dec 21 15:37 snap_disperse_vol_2_test1

drwxr-xr-x 3 root root 8192 Dec 21 15:37 snap_disperse_vol_2_test2




At 2021-12-22 14:09:55, "Aravinda VK" <aravinda at kadalu.io> wrote:

Observed one more thing from your Volume info. Snaps directory is configured as 

features.snapshot-directory: .snaps_disperse_vol_2

Try `ls /media3/.snaps_disperse_vol_2` and `ls /mnt/disperse_vol_2/.snaps_disperse_vol_2`

On 22-Dec-2021, at 11:07 AM, samfisher1 <samfisher1 at 126.com> wrote:

.snaps directory doesn't exist.
[root at pgsql-1 ~]# df -hT /mnt/glusterfs_disperse_vol_2
Filesystem                  Type            Size  Used Avail Use% Mounted on
pgsql-1:/disperse_vol_2.tcp fuse.glusterfs   38G  525M   38G   2% /mnt/glusterfs_disperse_vol_2

[root at pgsql-1 ~]# ls -la /mnt/glusterfs_disperse_vol_2/.snap*
ls: cannot access /mnt/glusterfs_disperse_vol_2/.snap*: No such file or directory
[root at pgsql-1 ~]# ls -la /mnt/glusterfs_disperse_vol_2/.snaps
ls: cannot access /mnt/glusterfs_disperse_vol_2/.snaps: No such file or directory

It makes me crazy, I don't have any clues to solve this problem. 


At 2021-12-22 12:30:27, "Aravinda VK" <aravinda at kadalu.io> wrote:

I think `.snaps` is not shown when you do `ls` it is a virtual directory. Please confirm if it is not visible when you run ls command as below.

ls /media3/.snaps

In the fuse example, Snap volume itself is mounted and not using User Serviceable snapshots feature. Try mounting as below and see if .snaps directory is visible.

mount -t glusterfs /mnt/disperse_vol_2
ls /mnt/disperse_vol_2/.snaps

Aravinda Vishwanathapura

On 22-Dec-2021, at 8:37 AM, samfisher1 <samfisher1 at 126.com> wrote:

Tks, Aravinda 
The snapshot is already activated and you can see the snapshot status is started in the previous command output.


At 2021-12-21 20:13:47, "Aravinda VK" <aravinda at kadalu.io> wrote:

Is the Snapshot activated?

gluster snapshot activate <snapname>

Aravinda Vishwanathapura

On 21-Dec-2021, at 4:06 PM, samfisher1 <samfisher1 at 126.com> wrote:

Sorry for disturbing you... Uh, I met a very strange GlusterFS problem: I can access snapshots by using FUSE mount and it works fine. However, when I test Gluster USER-SERVICEABLE snapshots feature, I find I cannot see .snap directory in the NFS shared directory. So pls help me solve this problem, many thanks~
My Gluster version is glusterfs 8.6. My OS version is CentOS 7.9.2009 

Here is gluster volume and snapshot info.

[root at pgsql-1 media-cifs]# gluster v info disperse_vol_2

Volume Name: disperse_vol_2
Type: Disperse
Volume ID: a8bd1d15-20c0-43af-a66e-eb166bd92f4c
Status: Started
Snapshot Count: 5
Number of Bricks: 1 x (4 + 2) = 6
Transport-type: tcp
Brick1: pgsql-1:/run/gluster/snaps/1c51095f455d4b93b1dd2fcfdfdb6127/brick1/data
Brick2: pgsql-2:/run/gluster/snaps/1c51095f455d4b93b1dd2fcfdfdb6127/brick2/data
Brick3: pgsql-3:/run/gluster/snaps/1c51095f455d4b93b1dd2fcfdfdb6127/brick3/data
Brick4: pgsql-1:/run/gluster/snaps/1c51095f455d4b93b1dd2fcfdfdb6127/brick4/data
Brick5: pgsql-2:/run/gluster/snaps/1c51095f455d4b93b1dd2fcfdfdb6127/brick5/data
Brick6: pgsql-3:/run/gluster/snaps/1c51095f455d4b93b1dd2fcfdfdb6127/brick6/data
Options Reconfigured:
features.show-snapshot-directory: on
features.snapshot-directory: .snaps_disperse_vol_2
features.uss: enable
storage.fips-mode-rchecksum: on
transport.address-family: inet
nfs.disable: on
features.quota: off
features.inode-quota: off
features.quota-deem-statfs: off
features.barrier: disable
snap-activate-on-create: disable
cluster.enable-shared-storage: enable

Here is the snapshot info:

[root at pgsql-1 media-cifs]# gluster snap info snap_disperse_vol_2_test1
Snapshot                  : snap_disperse_vol_2_test1
Snap UUID                 : 8cab3954-3055-43aa-b34f-bbff58375881
Created                   : 2021-12-21 09:23:43
Snap Volumes:

        Snap Volume Name          : 4dd90c9a08f1449fb865a368676ebd61
        Origin Volume name        : disperse_vol_2
        Snaps taken for disperse_vol_2      : 5
        Snaps available for disperse_vol_2  : 251
        Status                    : Started

But I can not see any .snaps directory in the media3 directory.

[root at pgsql-1 media-cifs]# mount -t nfs /media3/
[root at pgsql-1 media-cifs]# ls -a /media3
.       21.txt  24.txt  27.txt  2.txt   32.txt  35.txt  
..      22.txt  25.txt  28.txt  30.txt  33.txt  36.txt   

I can access snapshot by using FUSE mount and it works fine.
[root at pgsql-1 media-cifs]# mount -t glusterfs /mnt/snap/
[root at pgsql-1 media-cifs]# ls /mnt/snap/
20.txt  23.txt  26.txt  29.txt  31.txt  34.txt  37.txt  3.txt   42.txt  45.txt  48.txt  50.txt  7.txt
21.txt  24.txt  27.txt  2.txt   32.txt  35.txt  38.txt  40.txt  43.txt  46.txt  49.txt  5.txt   8.txt
22.txt  25.txt  28.txt  30.txt  33.txt  36.txt  39.txt  41.txt  44.txt  47.txt  4.txt   6.txt   9.txt
I haven't any clues to solve this problems, pls help me. tks~




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Aravinda Vishwanathapura

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