The following is from a former colleague, worth mentioning.
The ASM targets in OEM-GC give the next active warnings:
Metric: Disk Group Percent Imbalance
Message: Disk Group SYSTEMDG requires rebalance because the space usage imbalance between disks is high.
Metric: Disk Size Imbalance (%)
Message: Disk Group SYSTEMDG has failure groups with disks of different sizes which may lead to suboptimal space usage. Changing the configuration may alleviate this problem.
Reason for this warnings: created a SYSTEMDG diskgroup on two SAN’s and one NFS-node:
o S1_SYSTEMDG_001 – ASM disk on SAN1 (4.9Gb)
o S1_SYSTEMDG_002 – ASM disk on SAN1 (4.9Gb)
o S2_SYSTEMDG_001 – ASM disk on SAN2 (4.9Gb)
o S2_SYSTEMDG_002 – ASM disk on SAN2 (4.9Gb)
o SYSTEMDG_0004 – NFSfile on node pdcc1b – (0.49Gb)
· The 5th disk has been added as an extra Quorum (voting) disk.
Preferred solution: raise de NFS voting disk to 4.9Gb, and create a new voting file on the NFS voting server pdcc1b like this:
[grid@pdcc1b ~]$ cd /opt/oracle/vote/
[grid@pdcc1b vote]$ dd if=/dev/zero of=vote_file_5020 bs=1k count=5020k
Ø Connect the new voting file to SYSTEMDG
SQL> ALTER DISKGROUP SYSTEMDG ADD QUORUM DISK ‘/opt/oracle/vote/vote_file_5020’ NAME NFS_SYSTEMDG_VOTE SIZE 5020 M
Ø Remove the old voting file from the SYSTEMDG
SQL> ALTER DISKGROUP SYSTEMDG DROP DISK SYSTEMDG_0004
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