Boot the system to single-user mode.
If necessary, boot the system from a local CD-ROM or the network in single-user mode to access the disk.
See Chapter 13, SPARC: Booting a System (Tasks) or Chapter 14, x86: Booting a System (Tasks) for information on booting the system.
# format |
At this point, the format utility attempts to automatically configure any unlabeled SCSI disk. If the format utility is able to configure the unlabeled and corrupted disk, it will display:
cwtxdy: configured with capacity of abcMB |
The format utility then displays the list of disks on the system.
Type the number of the disk that you need to recover from the list displayed on your screen.
Specify disk (enter its number): 1 |
Select one of the following to determine how to label the disk.
Search for the backup label.
format> verify Warning: Could not read primary label. Warning: Check the current partitioning and 'label' the disk or use the 'backup' command. Backup label contents: Volume name = < > ascii name = <SUN1.05 cyl 2036 alt 2 hd 14 sec 72> pcyl = 2038 ncyl = 2036 acyl = 2 nhead = 14 nsect = 72 Part Tag Flag Cylinders Size Blocks 0 root wm 0 - 300 148.15MB (301/0/0) 303408 1 swap wu 301 - 524 110.25MB (224/0/0) 225792 2 backup wm 0 - 2035 1002.09MB (2036/0/0) 2052288 3 unassigned wm 0 0 (0/0/0) 0 4 unassigned wm 0 0 (0/0/0) 0 5 unassigned wm 0 0 (0/0/0) 0 6 usr wm 525 - 2035 743.70MB (1511/0/0) 1523088 7 unassigned wm 0 0 (0/0/0) 0 |
If the format utility was able to find a backup label and the backup label contents appear satisfactory, use the backup command to label the disk with the backup label.
format> backup Disk has a primary label, still continue? y Searching for backup labels...found. Restoring primary label |
The disk label has been recovered. Go to step 12.
If the format utility was not able to automatically configure the disk, specify the disk type by using the type command.
format> type |
The Available Drives Type menu is displayed.
Select 0 to automatically configure the disk, or select a disk type from the list of possible disk types.
Specify disk type (enter its number)[12]: 12 |
If the disk was successfully configured, reply with no when the format utility asks if you want to label the disk.
Disk not labeled. Label it now? no |
Use the verify command to search for backup labels.
format> verify Warning: Could not read primary label. Warning: Check the current partitioning and 'label' the disk or use the 'backup' command. . . . |
If the format utility was able to find a backup label and the backup label contents appear satisfactory, use the backup command to label the disk with the backup label.
format> backup Disk has a primary label, still continue? y Searching for backup labels...found. Restoring primary label |
The disk label has been recovered.
Exit the format utility.
format> q |
Verify the file systems on the recovered disk by using the fsck command.
For information on using the fsck command, see Chapter 43, Checking UFS File System Consistency (Tasks).