On Jan 12, 2007, at 1:18 PM, Garrett Cooper wrote:
1. Can I bypass mounting or reading certain sections of the
filesystem?
Sure, if you boot off some other device or a CD-ROM.
2. Can I force part of a drive to be remapped to other sectors?
Yes, but it is likely that modern drives will have automatically
reassigned failing sectors already, until it ran out of spare
sectors. If you've got an older SCSI system, you might try running
your adaptor's BIOS utility and having it do a device verify; that
will encourage the drive to remap problematic sectors.
3. Is there a backup superblock on the disk and what would it be? I
know
this feature exists on some filesystems, but I'm not sure if UFS is
one
of those filesystems.
There are many backup superblocks kept on the disk; "fsck -b 32" will
try using the first alternate, but there will be others scattered
about. You can run "dumpfs" to locate more, I believe.
The reason for these questions is that I believe that the
portion of my failing hard disk is involved with the statistics
portion
for the data slice or a series of directories. So, I want to grab the
files off my disk and just dump the thing asap.
OK. You might try doing a block-copy with dd to a new drive, and
then trying to fsck or repair the data on that copy rather than
trying to fix the filesystem on the failing drive...
--
-Chuck
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