Due to GI_HOME restricted access, you might get following errors when you extract opatch utility to GI_HOME:
checkdir error: cannot create /u01/app/12.2.0.1/grid/OPatch Permission denied unable to process OPatch/config/opatch.properties.
Here is one of the appropriate way for extracting opatch utility :
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After manually dismounting an ASM group, then queries on v$asm_* views hang forever.
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1) To disable certain ASM Diskgroup automatic mount on all RAC nodes, run below command as grid user:
$ srvctl disable diskgroup -diskgroup testdg
2) To disable certain ASM Diskgroup automatic mount on specific RAC node, run below command as grid user:
$ srvctl disable diskgroup -diskgroup testdg -node racnode1
3) To check the status of ASM diskgroup:
$ srvctl status diskgroup -diskgroup testdg -detail -verbose Disk Group testdg is running on racnode1, racnode2 Disk Group testdg is disabled
Note: You cannot run the “srvctl start” command on a disabled object until you first re-enable the object
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