ASM disk groups configured with normal or high redundancy are dismounted if the CVM master panics due to network failure in FSS environment or if CVM I/O shipping is enabled (3600155)
Disk-level remote write operations are paused during reconfiguration for longer than the default ASM heartbeat I/O wait time in the following scenarios:
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CVM master node panics
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Private network failure
As a result, the ASM disk groups get dismounted.
Workaround: See to the Oracle metalink document: 1581684.1
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