X V$ASM_DISKGROUP 视图解释说明

Table 12-35 shows the attributes for each disk group. To view the complete set of attributes for a disk group, 
use the V$ASM_DISKGROUP_STAT or V$ASM_DISKGROUP view.

See Also:
Oracle Database Reference for descriptions of disk group information displayed in the V$ASM_DISKGROUP view
Table 12-35 Attribute descriptions for lsdg command output

Attribute Name     Description
State              State of the disk group. Values include BROKEN, CONNECTED, DISMOUNTED, MOUNTED, QUIESCING, and UNKNOWN.
Type               Disk group redundancy (NORMAL, HIGH, EXTERNAL).
Rebal              Y if a rebalance operation is in progress.
Sector             Sector size in bytes.
Block              Block size in bytes.
AU                 Allocation unit size in bytes.
Total_MB           Size of the disk group in megabytes.
Free_MB            Free space in the disk group in megabytes, without regard to redundancy. From the V$ASM_DISKGROUP view.
Req_mir_free_MB    Amount of space that must be available in the disk group to restore full redundancy after the most severe failure that can be tolerated by the disk group. 
                   This is the REQUIRED_MIRROR_FREE_MB column from the V$ASM_DISKGROUP view.
Usable_file_MB     Amount of free space, adjusted for mirroring, that is available for new files. From the V$ASM_DISKGROUP view.
Offline_disks      Number of offline disks in the disk group. Offline disks are eventually dropped.
Voting_files       Specifies whether the disk group contains voting files (Y or N).
Name               Disk group name.

Example
The following example lists the attributes of the data disk group.
Example 12-37 Using the ASMCMD lsdg command

ASMCMD [+] > lsdg data
State    Type    Rebal  Sector  Block       AU  Total_MB  Free_MB  Req_mir_free_MB  Usable_file_MB
MOUNTED  NORMAL  N         512   4096  4194304     12288     8835             1117            3859

(continued)
Offline_disks    Voting_files     Name
            0               N     DATA