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Full Discussion: Dead partition on drive
Special Forums Hardware Filesystems, Disks and Memory Dead partition on drive Post 82876 by rhfrommn on Wednesday 7th of September 2005 11:07:19 AM
Old 09-07-2005
I'm not sure if this will work on a version of SunOS as old as you have, but in solaris 2.6 or so on up there is the newfs command. You can do

newfs -Nv /dev/rdsk/c0t0s0d0 (or whatever device your dead filesystem is)

and it will tell you the commands newfs would run and the output of them. The -N switch tells it NOT to create the filesystem, just to do a "dry run" and show you the results.

This may be a much easier way to get the alternate superblock information. Try a man newfs and see if you have that available to you.

Here is what I get when running it on the root filesystem of my workstation:

krypton# newfs -Nv /dev/rdsk/c0t0d0s0
mkfs -F ufs -o N /dev/rdsk/c0t0d0s0 76055280 255 16 8192 1024 229 1 90 8192 t 0 -1 8 16 n
/dev/rdsk/c0t0d0s0: 76055280 sectors in 18641 cylinders of 16 tracks, 255 sectors
37136.4MB in 717 cyl groups (26 c/g, 51.80MB/g, 6400 i/g)
super-block backups (for fsck -F ufs -o b=#) at:
32, 106368, 212704, 319040, 425376, 531712, 638048, 744384, 850720, 957056,
Initializing cylinder groups:
..............
super-block backups for last 10 cylinder groups at:
74999360, 75105696, 75212032, 75318368, 75424704, 75531040, 75637376,
75743712, 75850048, 75956384,
 

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REPARTITION(8)						      System Manager's Manual						    REPARTITION(8)

NAME
repartition - load a partition table SYNOPSIS
repartition device [partition-file] DESCRIPTION
Repartition uploads a new partition table for the partitions of device. The table is obtained from the first sector of partition-file if given, device otherwise. Device may refer to the whole drive or a primary partition, depending on whether you want to upload a partition or a subpartition table. The partitions will be truncated to fit within the enclosing device like the disk driver does, unless the numbers are coming from partition-file. EXAMPLES
repartition /dev/hd0 repartition /dev/hd4 /etc/hd4.table Reload the partition table of drive 0 setting /dev/hd[1-4], and the subpartition table of /dev/hd4 setting /dev/hd4[a-d] using a file. The latter may be useful if you need more than the 4 subpartitions a single Minix partition gives you. DIAGNOSTICS
The new table is printed on standard output. FILES
/dev/hd[0-9] SEE ALSO
hd(4), part(8). BUGS
The disk must be in use for the changes to stick. The partition table of an idle disk will be reloaded on the first open. AUTHOR
Kees J. Bot (kjb@cs.vu.nl) REPARTITION(8)
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