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This alarm is generated when a disk is about to expire.
1. Log in to the OMU portal, choose Storage > Disk Manage, and check whether the disk is about to expire.
2. If the RAID group status is abnormal, restore the RAID group status and replace the disk. Then check whether the alarm is cleared.
3. If multiple disks are abnormal, replace them one by one.
For details, see ALM-308521709 About-to-Expire Disk.