1.使用oracle賬號連接數據庫，查看v$asm_diskgroup
2.使用grid賬號連接ASM實例，查看v$asm_diskgroup
3.官方v$asm_diskgroup關於state的解釋
CONNECTED - Disk group is in use by the database instance
BROKEN - Database instance lost connectivity to the Oracle ASM instance that mounted the disk group
UNKNOWN - Oracle ASM instance has never attempted to mount the disk group
DISMOUNTED - Disk group was cleanly dismounted by the Oracle ASM instance following a successful mount
MOUNTED - Instance is successfully serving the disk group to its database clients
QUIESCING - CRSCTL utility attempted to dismount a disk group that contains the Oracle Cluster Registry (OCR). The disk group cannot be dismounted until Cluster Ready Services (CRS) exits, because the disk group contains the OCR.
v$asm_diskgroup還有個額外的說明：
