For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.4.
# unmount /mount-point
# newfs -N /dev/rdsk/device-name
The command output displays the block numbers that were used for the superblock copies when the newfs command created the file system, unless the file system was created with special parameters. For information about creating a customized file system, Customizing UFS File System Parameters.
Caution - Ensure to use the –N option. If you omit the –N option, you might destroy all the data in the file system and replace it with an empty file system. |
# fsck -F ufs -o b=block-number /dev/rdsk/device-name
The fsck command uses an alternate superblock to restore the primary superblock. You can try 32 as an alternate block. You can use any of the alternate blocks shown by the newfs –N command.
The following example shows how to restore the superblock copy 5264.
# newfs -N /dev/rdsk/c0t3d0s7 /dev/rdsk/c0t3d0s7: 163944 sectors in 506 cylinders of 9 tracks, 36 sectors 83.9MB in 32 cyl groups (16 c/g, 2.65MB/g, 1216 i/g) super-block backups (for fsck -b #) at: 32, 5264, 10496, 15728, 20960, 26192, 31424, 36656, 41888, 47120, 52352, 57584, 62816, 68048, 73280, 78512, 82976, 88208, 93440, 98672, 103904, 109136, 114368, 119600, 124832, 130064, 135296, 140528, 145760, 150992, 156224, 161456, # fsck -F ufs -o b=5264 /dev/rdsk/c0t3d0s7 Alternate superblock location: 5264. ** /dev/rdsk/c0t3d0s7 ** Last Mounted on ** Phase 1 - Check Blocks and Sizes ** Phase 2 - Check Pathnames ** Phase 3 - Check Connectivity ** Phase 4 - Check Reference Counts ** Phase 5 - Check Cyl groups 36 files, 867 used, 75712 free (16 frags, 9462 blocks, 0.0% fragmentation) ***** FILE SYSTEM WAS MODIFIED ***** #