ORA-15130: diskgroup "string" is being dismounted

Cause : The diskgroup is being dismounted by request or because an I/O error was encountered that could not be handled by taking the disks offline. A disk cannot be offlined whenever doing so could result in all copies of a redundant extent being unavailable.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Repair the hardware problem and re-mount the diskgroup. Refer to the alert log to determine which disks have failed.

update : 27-04-2017
ORA-15130

ORA-15130 - diskgroup "string" is being dismounted
ORA-15130 - diskgroup "string" is being dismounted

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