Before making any changes, retrieve the trace file that corresponds to the background error. Look for lines right above the alert in your ASM alert log to identify the specific RBAL or GMON background trace file.
Re-scans, OS reboots, or sector size changes ( ORA-15085 ) on the SAN break the shared storage layer. 📋 Comprehensive Troubleshooting Guide asm health checker found 1 new failures updated
The disk group has dropped offline. This indicates a loss of disk quorum. 3. Check for Ongoing Rebalance Operations Before making any changes, retrieve the trace file
A manual or automatic rebalance may clear the problem if the disk group maintains redundancy. Check the background work status: 📋 Comprehensive Troubleshooting Guide The disk group has
Too many offline disks in the PST disable the read quorum, triggering a forced dismount.
Run the following SQL query within the SQL*Plus environment of the affected ASM instance to identify the disk group's operational mode: