The Installer permits the creation of a disk group for use by the voting disks and OCR file.

If no ASM disk groups are specified during installation, then ASM instances are not started after the installation completes on any cluster node.

The Installer permits the creation of a disk group to be used for the Recovery Area for the ASM instance.

If ASM disk groups are configured for the Clusterware files, then ASM must be used for all databases on the cluster.

ASM disk groups used for voting files and OCR files require a quorum failgroup.

Some grid infrastructure patchsets may not be installed in a rolling fashion.

They can be applied in-place.

When performing rolling patches, crsctl query crs softwareversion always displays the lowest version of the software running anywhere in the cluster

When performing rolling patches, the VIPs for the node being patched are relocated to another node.

All node evictions require that the evicted node or nodes be rebooted.

A node whose performance is severely degraded can be evicted.

The OCSSD process may evict a node after an escalation request from a database instance LMON process.

The CSSDMONITOR process can request a node eviction.

The OCLSKD process is used for node eviction requests originating on the node to be evicted.

The reboot advisory broadcasts reboot decisions only over the interconnect.