What is the usable space of normal redundancy disk group with two uneven capacity fail groups

Hi,
I have a normal redundancy disk group (DATA) with two uneven capacity fail groups (FG1 and FG2). FG1 size is 10GB and FG2 size is 100GB.
In this case what will be the usable space of the disk group (DATA)? is it 10G or 55G?
Thanks,
Mahi

Please, don't duplicate post with same matter.
This question was answered in your previous thread.
Re: ASM normal redundancy disk group

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  • ASM normal redundancy disk group

    Hi,
    One of my collegues created an ASM disk group with normal redundancy using 2 disks. But the disks are not of same size, one disk is 100GB and another one is 10GB.
    Now the usable space out of diskgroup is showing 55GB. When I checked the diskgroup properties it is showing 2 fail groups one is DATA1_0000 with 10GB and other is DATA_0001 with 100GB.
    My question is why it is showing 55GB as usable space?
    My assumption is as it is having 2 fail groups with different disks of different sizes. For the failgroup 2 even it is of 100GB size, in order to maintain the redundancy with other small FG(10G) it will consider only 10GB out of 100GB.
    So, the 2nd FG size also should be 10GB. So that the usable space should show as 10GB as opposed to 55GB (not (100+10)/2).
    Please clarify me.
    Thanks,
    Mahi

    Hi,
    Please see the below output, I am talking about DATA1 disk group with number 2.
    SQL> select group_number,name, type,total_mb, free_mb, required_mirror_free_mb, usable_file_mb from v$asm_diskgroup;
    GROUP_NUMBER NAME                           TYPE     TOTAL_MB    FREE_MB
    REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB
               1 DATA                           NORMAL       6144       5344
                       2048           1648
               2 DATA1                          NORMAL     112640     108604
    SQL> select group_number, name, mount_status, state, redundancy,  failgroup, failgroup_type, os_mb, total_mb, free_mb from v$asm_disk;
    GROUP_NUMBER NAME                           MOUNT_S STATE    REDUNDA
    FAILGROUP                      FAILGRO      OS_MB   TOTAL_MB    FREE_MB
               1 DATA_0000                      CACHED  NORMAL   UNKNOWN
    DATA_0000                      REGULAR       2048       2048       1781
               1 DATA_0001                      CACHED  NORMAL   UNKNOWN
    DATA_0001                      REGULAR       2048       2048       1782
               1 DATA_0002                      CACHED  NORMAL   UNKNOWN
    DATA_0002                      REGULAR       2048       2048       1781
    GROUP_NUMBER NAME                           MOUNT_S STATE    REDUNDA
    FAILGROUP                      FAILGRO      OS_MB   TOTAL_MB    FREE_MB
               2 DATA1_0000                     CACHED  NORMAL   UNKNOWN
    DATA1_0000                     REGULAR      10240      10240       8222
               2 DATA1_0001                     CACHED  NORMAL   UNKNOWN
    DATA1_0001                     REGULAR     102400     102400     100382
    Thanks,
    Mahipal

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