The labeling of a disk is usually done during system installation or when you are creating new disk slices. You might need to relabel a disk if the disk label becomes corrupted. For example, from a power failure.
The format utility attempts to automatically configure any unlabeled SCSI disk. If the format utility is able to automatically configure an unlabeled disk, it displays a message similar to the following:
c0t0d1: configured with capacity of 4.00GB
Tip - For information on labeling multiple disks with the same disk label, see Labeling Multiple Disks by Using the prtvtoc and fmthard Commands.
You can use the following procedure to do the following:
Label a disk with a VTOC or an EFI label for a disk 2 terabytes in size.
Label a disk that is greater than 2 terabytes in size with an EFI label.
If you want to put an EFI label on disk smaller than 2 terabytes, see Example 11-6.
A numbered list of disks is displayed.
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.
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.
Disk not labeled. Label it now? y
The disk is now labeled. Go to step 10 to exit the format utility.
The Available Drive Types menu is displayed.
Specify disk type (enter its number): 12
Or, select 0 to automatically configure a SCSI-2 disk. For more information, see How to Automatically Configure a SCSI Drive.
Disk not labeled. Label it now? y
Otherwise, you are prompted with this message:
Ready to label disk, continue? y
format> q #
Example 11-5 Labeling a Disk
# format c1t0d0: configured with capacity of 1002.09MB AVAILABLE DISK SELECTIONS: 0. c0t3d0 <SUN1.05 cyl 2036 alt 2 hd 14 sec 72> /iommu@f,e0000000/sbus@f,e0001000/espdma@f,400000/esp@f,800000/sd@1,0 1. c1t0d0 <SUN1.05 cyl 2036 alt 2 hd 14 sec 72> /iommu@f,e0000000/sbus@f,e0001000/espdma@f,400000/esp@f,800000/sd@1,0 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 is 2 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 AVAILABLE DISK SELECTIONS: 1. c1t0d0 <SUNW18g cyl 7506 alt 2 hd 19 sec 248> /sbus@2,0/QLGC,isp@2,10000/sd@0,0 2. c1t1d0 <SUNW18g cyl 7506 alt 2 hd 19 sec 248> /sbus@2,0/QLGC,isp@2,10000/sd@1,0 3. c1t8d0 <SUNW18g cyl 7506 alt 2 hd 19 sec 248> /sbus@2,0/QLGC,isp@2,10000/sd@8,0 4. c1t9d0 <SUNW18g cyl 7506 alt 2 hd 19 sec 248> /sbus@2,0/QLGC,isp@2,10000/sd@9,0 Specify disk (enter its number): 4 selecting c1t9d0 [disk formatted] format> label  SMI Label  EFI Label Specify Label type: 1 Ready to label disk, continue? yes format> quit
Examine disk label information by using the prtvtoc command. For a detailed description of the disk label and the information that is displayed by the prtvtoc command, see Chapter 10, Managing Disks (Overview).
# prtvtoc /dev/rdsk/device-name
where device-name is the raw disk device you want to examine.
Example 11-7 Examining a Disk Label
# prtvtoc /dev/rdsk/c0t0d0s0 * /dev/rdsk/c0t0d0s0 partition map * * Dimensions: * 512 bytes/sector * 63 sectors/track * 15 tracks/cylinder * 945 sectors/cylinder * 8894 cylinders * 8892 accessible cylinders * * Flags: * 1: unmountable * 10: read-only * * First Sector Last * Partition Tag Flags Sector Count Sector Mount Directory 0 2 00 1048950 3381210 4430159 / 1 3 01 0 1048950 1048949 2 5 00 0 8402940 8402939 7 8 00 4430160 3972780 8402939 /export/home
The following example shows disk label information for a disk with an EFI label.
# prtvtoc /dev/rdsk/c3t1d0s0 * /dev/rdsk/c3t1d0s0 partition map * * Dimensions: * 512 bytes/sector * 2479267840 sectors * 2479267773 accessible sectors * * Flags: * 1: unmountable * 10: read-only * * First Sector Last * Partition Tag Flags Sector Count Sector Mount Directory 0 2 00 34 262144 262177 1 3 01 262178 262144 524321 6 4 00 524322 2478727100 2479251421 8 11 00 2479251422 16384 2479267805