1. Installing and Configuring an Oracle Solaris Cluster 4.4 Environment
  2. Planning the Oracle Solaris Cluster Configuration
  3. Planning Volume Management
  4. Mirroring Guidelines
  5. Guidelines for Mirroring Multihost Disks

Guidelines for Mirroring Multihost Disks

Mirroring all multihost disks in an Oracle Solaris Cluster configuration enables the configuration to tolerate single-device failures. Oracle Solaris Cluster software requires that you mirror all multihost disks across expansion units. You do not need to use software mirroring if the storage device provides hardware RAID as well as redundant paths to devices.

Consider the following points when you mirror multihost disks:

  • Separate disk expansion units – Each submirror of a given mirror or plex should reside in a different multihost expansion unit.

  • Disk space – Mirroring doubles the amount of necessary disk space.

  • Three-way mirroring – Solaris Volume Manager software supports three-way mirroring. However, Oracle Solaris Cluster software requires only two-way mirroring.

  • Differing device sizes – If you mirror to a device of a different size, your mirror capacity is limited to the size of the smallest submirror or plex.

For more information about multihost disks, see Multihost Devices in Concepts for Oracle Solaris Cluster 4.4.