Understanding the "REQUIRED_MIRROR_FREE_MB in" v$asm_diskgroup
What Oracle's doc says about the REQUIRED_MIRROR_FREE_MB is
In oracle's ASM Administrator Guide:
–Normal redundancy disk group with more than two failure groups
The value is the total raw space for all of the disks in the largest failure group
In oracle's ASM Administrator Guide:
–Normal redundancy disk group with more than two failure groups
The value is the total raw space for all of the disks in the largest failure group
Then I do a simple test to prove this:
Candidate Disk ready to be managed by ASM: 5 hdiskpower disks ,size 46777MB for each disk
SQL>select total_MB,path from v$asm_disk where path like '%power%';
TOTAL_MB PATH
46477 /dev/rhdiskpower5
46477 /dev/rhdiskpower6
46477 /dev/rhdiskpower7
46477 /dev/rhdiskpower8
46477 /dev/rhdiskpower9
Now create a diskgroup with the 5 hdiskpowers:
0