ALERT.LOG for ASM Shows "WARNING: failed to online diskgroup resource ora.GI.dg (unable to communicate with CRSD/OHASD)" [ID 1060920.1]
现象：
If OCR is located on ASM diskgroup, following shows in ASM alert log ($ORACLE_BASE/diag/asm/+asm/+ASMn/trace/alert_+ASMn.log) after ASM mounted all diskgroup successfully while starting up Grid Infrastructure(CRS):
SQL> ALTER DISKGROUP ALL MOUNT /* asm agent */
..
SUCCESS: diskgroup GI was mounted
SUCCESS: ALTER DISKGROUP ALL MOUNT /* asm agent */
..
WARNING: failed to online diskgroup resource ora.GI.dg (unable to communicate with CRSD/OHASD)
Or after ASM dismounted all diskgroup successfully while shutting down clusterware:
..
SUCCESS: ALTER DISKGROUP ALL DISMOUNT /* asm agent */
Sun Feb 07 11:11:13 2010
WARNING: failed to offline diskgroup resource ora.GI.dg (unable to communicate with CRSD/OHASD)
..
freeing rdom 0
原因：
In contrast to previous version of CRS, 11gR2 ASM does not depend on CRSD anymore; rather ASM starts before CRSD while clusterware is coming up, and stops after CRSD while clusterware is going down. Due to the new startup sequence, ASM can not update diskgroup resource status in CRSD either during clusterware startup or shutdown, thus above message is logged.
解决方法：
The message can be ignored, the status of diskgroup and diskgroup resource will be synchronize by oraagent once clusterware is fully up.
查看磁盘组的状态信息：
$GRID_HOME/bin/srvctl status diskgroup -g diskgroupname -a
To start or sync diskgroup resource:
$GRID_HOME/bin/srvctl start diskgroup -g diskgroupname
