Oracle 12c RAC/ASM Instance will Crash if one Site is Down in an Stretch (Extended) Cluster.
Last updated on JUNE 21, 2017
Applies to:Linux OS - Version Oracle Linux 6.0 and later
12c RAC/ASM is configured in multiple sites in an stretch (extended) cluster.
In this setup, database has ASM diskgroups having access to 2-pathed local disk device and 2-pathed remote disk device.
When the remote 2-paths are down, the I/Os (Input / Outputs) to the remote site are stuck and will not fail or complete by at least 2 minutes. At that tile, DB processes like LMON will be in D state (i.e. wait for I/O completions) as shown below:
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