Why snapshot creation failed with error "snapshot create: failed: Cluster operating version is lesser than the supported version for a snapshot" after upgrading from RHS 2.1 to RHS 3.0 ?

Issue

• snapshot creation failed with the following error after upgrading from RHS 2.1 to RHS 3.0,

[root@test ~]# gluster snapshot create snaptest1 test-volume
snapshot create: failed: Cluster operating version is lesser than the supported version for a snapshot
Snapshot command failed            <<----------------------

[root@test glusterd]# gluster volume info test-volume
Volume Name: test-volume
Type: Replicate
Volume ID: 4cb3e1eb-5137-4b0f-a605-8bccdd3a93bb
Status: Started
Snap Volume: no
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: gfo01.uit.no:/rhs/storage3/brick03
Brick2: gfo02.uit.no:/rhs/storage3/brick03

[root@test glusterd]# cat glusterd.info
UUID=b14d72cd-54ae-4132-a44c-df2eead1e51f
operating-version=2