Shared storage planning for grid infrastructure

There are three ways of storing Grid infrastructure files:

• A supported Cluster File System (CFS)
• A certified Network File System (NFS)
• Automatic Storage Management (ASM)

Sizing Shared Storage
Minimum sizing for Oracle Clusterware configuration files using External,
Normal, or High redundancy:

Managing Voting Disks in ASM

• Each node must be able to access a majority of voting disks;
  otherwise, it will be evicted from the cluster.
• Voting disks can be stored on an ASM disk group.
• The number of voting disks is determined by the ASM disk group
  redundancy setting.
1. 1 for external redundancy disk group
2. 3 for normal redundancy disk group
3. 5 for high redundancy disk group
• A separate failure group is required for each voting disk.
• Voting disks are managed using the ‘crsctl’ utility.