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