2.2.5.2 Sun StorEdge Volume Manager and Cluster Volume Manager Considerations

Consider these points when planning SSVM and CVM configurations:

• You must create a default disk group (rootdg) on each cluster node. The rootdg group consists of either one slice (a "simple" disk) or a whole disk. It can be encapsulated.

• If the rootdg consists of a simple disk, a one slice table entry and at least two cylinders on the root disk must be left free.

• If the rootdg is encapsulated, then two disk slice table entries must be left free. In addition, only the root (/), /usr, /var, and swap file systems should be present on the encapsulated root disk.

• Encapsulation makes it more difficult to upgrade the volume manager software; if you anticipate frequent upgrades, encapsulating the rootdg is not recommended. However, if you want to mirror the root disk, you must encapsulate the rootdg.

Insufficient disk space and slices prevent encapsulation of the boot disk later and increase installation time because the operating environment might have to be reinstalled.

You will need licenses for Sun StorEdge Volume Manager if you use it with any storage devices other than SPARCstorage Arrays or Sun StorEdge A5000s. SPARCstorage Arrays and Sun StorEdge A5000s include bundled licenses for use with SSVM. Contact the Sun License Center for any necessary SSVM licenses; see http://www.sun.com/licensing/ for more information.

You do not need licenses to run Solstice DiskSuite or Cluster Volume Manager with Sun Cluster.