Mirroring the Root Disk

Mirroring the root disk prevents the cluster node itself from shutting down because of a system disk failure. Four types of file systems can reside on the root disk. Each file system type is mirrored by using a different method.

Use the following procedures to mirror each type of file system.

• "How to Mirror the Root (/) File System"

• "How to Mirror the Global Namespace"

• "How to Mirror File Systems That Cannot Be Unmounted"

• "How to Mirror User-Defined File Systems"

Some of the steps in these mirroring procedures can cause an error message similar to the following, which is harmless and can be ignored.

metainit: dg-schost-1: d1s0: not a metadevice

For local disk mirroring, do not use /dev/global as the path when specifying the disk name. Specifying this path for anything other than cluster file systems prevents the system from booting.