ASM disk group state shows as ‘CONNECTED’

As we know, normally disk group state is ‘MOUNTED’ or ‘DISMOUNTED’, etc. Today, when I ran the following query, two disk group state shows as ‘CONNECTED’:

SQL> select NAME,STATE from v$asm_diskgroup ;

NAME       STATE 
---------- ---------
DATA       CONNECTED                                                      
RECO       CONNECTED 
...
..
.

According to Oracle doc, ‘CONNECTED’ means disk group is in use by the database instance:

STATE

VARCHAR2(11)

State of the disk group relative to the instance: CONNECTED – Disk group is in use by the database instance BROKEN – Database instance lost connectivity to the Oracle ASM instance that mounted the disk group UNKNOWN – Oracle ASM instance has never attempted to mount the disk group DISMOUNTED – Disk group was cleanly dismounted by the Oracle ASM instance following a successful mount MOUNTED – Instance is successfully serving the disk group to its database clients QUIESCING – CRSCTL utility attempted to dismount a disk group that contains the Oracle Cluster Registry (OCR). The disk group cannot be dismounted until Cluster Ready Services (CRS) exits, because the disk group contains the OCR.