[Gluster-users] Gluster snapshot fails

Rafi Kavungal Chundattu Parambil rkavunga at redhat.com
Wed Apr 10 13:05:01 UTC 2019

Hi Strahil,

The name of device is not at all a problem here. Can you please check the log of glusterd, and see if there is any useful information about the failure. Also please provide the output of `lvscan` and `lvs --noheadings -o pool_lv` from all nodes

Rafi KC

----- Original Message -----
From: "Strahil Nikolov" <hunter86_bg at yahoo.com>
To: gluster-users at gluster.org
Sent: Wednesday, April 10, 2019 2:36:39 AM
Subject: [Gluster-users] Gluster snapshot fails

Hello Community, 

I have a problem running a snapshot of a replica 3 arbiter 1 volume. 

[root at ovirt2 ~]# gluster snapshot create before-423 engine description "Before upgrade of engine from 4.2.2 to 4.2.3" 
snapshot create: failed: Snapshot is supported only for thin provisioned LV. Ensure that all bricks of engine are thinly provisioned LV. 
Snapshot command failed 

Volume info: 

Volume Name: engine 
Type: Replicate 
Volume ID: 30ca1cc2-f2f7-4749-9e2e-cee9d7099ded 
Status: Started 
Snapshot Count: 0 
Number of Bricks: 1 x (2 + 1) = 3 
Transport-type: tcp 
Brick1: ovirt1:/gluster_bricks/engine/engine 
Brick2: ovirt2:/gluster_bricks/engine/engine 
Brick3: ovirt3:/gluster_bricks/engine/engine (arbiter) 
Options Reconfigured: 
cluster.granular-entry-heal: enable 
performance.strict-o-direct: on 
network.ping-timeout: 30 
storage.owner-gid: 36 
storage.owner-uid: 36 
user.cifs: off 
features.shard: on 
cluster.shd-wait-qlength: 10000 
cluster.shd-max-threads: 8 
cluster.locking-scheme: granular 
cluster.data-self-heal-algorithm: full 
cluster.server-quorum-type: server 
cluster.quorum-type: auto 
cluster.eager-lock: enable 
network.remote-dio: off 
performance.low-prio-threads: 32 
performance.io-cache: off 
performance.read-ahead: off 
performance.quick-read: off 
transport.address-family: inet 
nfs.disable: on 
performance.client-io-threads: off 
cluster.enable-shared-storage: enable 

All bricks are on thin lvm with plenty of space, the only thing that could be causing it is that ovirt1 & ovirt2 are on /dev/gluster_vg_ssd/gluster_lv_engine , while arbiter is on /dev/gluster_vg_sda3/gluster_lv_engine. 

Is that the issue ? Should I rename my brick's VG ? 
If so, why there is no mentioning in the documentation ? 

Best Regards, 
Strahil Nikolov 

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