Mount_status of v$asm_disk could be several values.Among of these,is there different between 'opened' and 'cached'?
In Database Reference,it says:
OPENED - Disk is present in the storage system and is being accessed by Oracle ASM. This is the normal state for disks in a database instance which are part of a Disk Group being actively used by the instance.
CACHED - Disk is present in the storage system and is part of a disk group being accessed by the Oracle ASM instance. This is the normal state for disks in an Oracle ASM instance which are part of a mounted disk group.
My enviroment is Grid Infrastructure on a standalone windwos server.And when i make a enquiry either through rdbms or asm instance,it always reports that the column,mount_status, is cached.
SYS@+asm> select group_number,disk_number,mount_status,header_status,state,redundancy,
2 path from v$asm_disk;
GROUP_NUMBER DISK_NUMBER MOUNT_S HEADER_STATU STATE REDUNDA PATH
------------ ----------- ------- ------------ -------- ------- --------------------
1 0 CACHED MEMBER NORMAL UNKNOWN \\.\ORCLDISKDATA0
1 1 CACHED MEMBER NORMAL UNKNOWN \\.\ORCLDISKDATA1
1 2 CACHED MEMBER NORMAL UNKNOWN \\.\ORCLDISKDATA2
1 3 CACHED MEMBER NORMAL UNKNOWN \\.\ORCLDISKDATA3
SYS@orcl>select group_number,disk_number,mount_status,header_status,state,redundancy,
2 path from v$asm_disk;
GROUP_NUMBER DISK_NUMBER MOUNT_S HEADER_STATU STATE REDUNDA PATH
------------ ----------- ------- ------------ -------- ------- --------------------
1 0 CACHED MEMBER NORMAL UNKNOWN \\.\ORCLDISKDATA0
1 1 CACHED MEMBER NORMAL UNKNOWN \\.\ORCLDISKDATA1
1 2 CACHED MEMBER NORMAL UNKNOWN \\.\ORCLDISKDATA2
1 3 CACHED MEMBER NORMAL UNKNOWN \\.\ORCLDISKDATA3
I wonder under what circumstance it would display 'opened',and under what circumastance it would be 'cached'?