The disk group has dropped offline. This indicates a loss of disk quorum. 3. Check for Ongoing Rebalance Operations
Run the following SQL query within the SQL*Plus environment of the affected ASM instance to identify the disk group's operational mode: asm health checker found 1 new failures updated
A manual or automatic rebalance may clear the problem if the disk group maintains redundancy. Check the background work status: The disk group has dropped offline
# Locate your ASM Alert log using the ADRCI tool adrci> show alert -p "message_text like '%ASM Health Checker%'" Use code with caution. 2. Verify Your Current Disk Group Status Check for Ongoing Rebalance Operations Run the following
When your ASM instance registers a failure, use this sequence of administrative tasks to evaluate and fix the problem. 1. Locate the Relevant Trace Files
Intermittent loss of connectivity to the SAN/LUNs causes heartbeat timeout warnings (e.g., Waited 15 secs for write IO ).