Disk label is an area at the front of each disk on which geometry and slice information are stored.
In Solaris, two types of disk labels below can be used:
VTOC label (Also called SMI label)
EFI label
Creation and change of the disk labels can be executed with the format(1M) command.
Both VTOC labeled and EFI labeled disks can be managed in GDS, however, the types of class which can be registered and the size of disk vary according to the disk label types.
Disk label type | |||
|---|---|---|---|
VTOC | EFI | ||
Type of class | Root | Available | Unavailable |
Local | Available | Available | |
Shared | Available | Available | |
Size of disk | Smaller than 1 TB | Available | Available |
1 TB or larger | Unavailable | Available | |
The class which registers VTOC labeled disks and another which registers EFI labeled disks need to be separated. Disks with different label types cannot exist together in the same class.
The disk label type of a class can be viewed in the LABEL field of Class information displayed with the sdxinfo -C -e label command.
For the class of EFI label, the function below is unavailable:
GDS Snapshot
Note
To change the disk label type
Change the disk label type with the following procedure:
Change the disk label by using the format(1M) command.
To change the disk label of the shared disk in the cluster system to EFI type, perform one of the following methods:
Change the disk label on all the nodes which share the disk by using the format(1M) command.
After changing the disk label by using the format(1M) command on one node, reboot all the other nodes which share the disk.
When you change the disk label to EFI type with other than the methods above, it may take time to register the disk, or the disk registration may be failed with the error message "read error, errno=48." If the disk registration is failed, perform the procedure 1) through 3), and then register the disk again.
Perform one of the following operations on all the servers where the disk, its label type has changed, is connected:
Execute [Update Physical Disk Information] in the [Operation] menu on GDS Management View.
Reboot the server.
When you changed the disk label type of the shared disk in the cluster system, perform the automatic resource registration.
