On 09/18/2014 01:23 PM, Tom Horsley wrote:
On Thu, 18 Sep 2014 12:45:37 -0600
jd1008 wrote:
I was also looking for the formula that is used to compute the location
of all of the backup superblocks.
OK, I found my notes from the last time I did this the paragraph about
units may be the important part :-).
I was able to mount the busted partition (read only, of course) using an
alternate superblock like so:
mount -o ro,sb=3276800 /dev/sdXX /mountpoint
Where you find a number like 3276800 by doing:
dumpe2fs /dev/sdXX | grep -i superblock
Natually the units are all wrong, you need to multiply the numbers
that show up in the dumpe2fs listing by 4 to pass them to the
sb= on the mount command. (This may be the important missing info :-).
I used one of the superblocks in the middle of the list to get it
to mount, and was able to copy off some of the files.
dumpe2fs also fails for same reasons stated.
I have already tried all the superblocks. All of them
have bad magic.
So, first I wlll try the debugfs suggested by Nathan Schwartz
and I will try Rick Steven's suggestion.
Thanx,
JD
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