System Administration Guide: Devices and File Systems

ProcedureHow to Label a Disk

You can use the following procedure to do the following:

If you want to put an EFI label on disk smaller than 2 terabytes, see Example 11–6.

  1. Become superuser or assume an equivalent role.

  2. Invoke the format utility.

    # format

    A numbered list of disks is displayed.

  3. Type the number of the disk that you want to label.

    Specify disk (enter its number):1

    If the format utility recognizes the disk type, the next step is to search for a backup label to label the disk. Labeling the disk with the backup label labels the disk with the correct partitioning information, the disk type, and disk geometry.

  4. Select one of the following to label the disk:

    • If the disk is unlabeled and was successfully configured, go to Step 5 to label the disk.

      The format utility will ask if you want to label the disk.

    • If the disk is labeled but you want to change the disk type, or if the format utility was not able to automatically configure the disk, proceed to Step 6 to set the disk type and label the disk.

  5. Label the disk by typing y at the Label it now? prompt.

    Disk not labeled. Label it now? y

    The disk is now labeled. Go to step 10 to exit the format utility.

  6. Enter type at the format> prompt.

    format> type

    The Available Drive Types menu is displayed.

  7. Select a disk type from the list of possible disk types.

    Specify disk type (enter its number)[12]: 12

    Or, select 0 to automatically configure a SCSI-2 disk. For more information, see How to Automatically Configure a SCSI Drive.

  8. Label the disk. If the disk is not labeled, the following message is displayed.

    Disk not labeled. Label it now? y

    Otherwise, you are prompted with this message:

    Ready to label disk, continue? y
  9. Verify the disk label.

    format> verify 
  10. Exit the format utility.

    format> q

Example 11–5 Labeling a Disk

The following example shows how to automatically configure and label a 1.05-Gbyte disk.

# format
	c1t0d0: configured with capacity of 1002.09MB
	  0. c0t3d0 <SUN1.05 cyl 2036 alt 2 hd 14 sec 72>
	  1. c1t0d0 <SUN1.05 cyl 2036 alt 2 hd 14 sec 72>
Specify disk (enter its number): 1
Disk not labeled.  Label it now?  yes
format> verify
format> q

Example 11–6 Labeling a Disk 2 Terabytes or Less With an EFI Label

The following example shows how to use the format -e command to label a disk that is2 terabytes or less with an EFI label. Remember to verify that your layered software products will continue to work on systems with EFI-labeled disks. For general information on EFI label restrictions, see Restrictions of the EFI Disk Label.

# format -e
Searching for disks...done
       1. c1t0d0 <SUNW18g cyl 7506 alt 2 hd 19 sec 248>
       2. c1t1d0 <SUNW18g cyl 7506 alt 2 hd 19 sec 248>
       3. c1t8d0 <SUNW18g cyl 7506 alt 2 hd 19 sec 248>
       4. c1t9d0 <SUNW18g cyl 7506 alt 2 hd 19 sec 248>
Specify disk (enter its number): 4
selecting c1t9d0
[disk formatted]
format> label
[0] SMI Label
[1] EFI Label
Specify Label type[0]: 1
Ready to label disk, continue? yes
format> quit