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 Other Than Root (/) That Cannot Be Unmounted

• How to Mirror File Systems That Can Be Unmounted

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 you specify the disk name. If you specify this path for anything other than cluster file systems, the system cannot boot.