03-25-2013
Glad it worked for you!
re: how - If you still have the system - see if the file is still there. Could have been removed by accident. Does not happen often, and I forget "how they did it", but this is actually something that "went wrong" every now and then during AIX administration classes.
This is why/how I knew "what to do", rather suggest, when I saw your earlier post.
In short, cannot put on backup if the file is unlinked.
If I recall, it was something about people not wanting /unix to be a symbolic link (not what they were used to) and they "fixed it" - to their demise.
Some history: the origin of the symbolic link goes back to the days when you could boot as mp or up kernel (multi-processor or uni-processor). The up kernel was slightly faster on a uni-processor system but did not work on a multi-processor system. The mp kernel worked on both (so the boot program on installation media was always mp based). In short, on a uni-processor system you could swap between up or mp kernel by changing the link and creating the bosboot again.
Later this was also used to support switching between 32 and 64 bit kernels.
Now there is only the unix_64 kernel. (AIX 6.X and later)
This User Gave Thanks to MichaelFelt For This Post:
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LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)
NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS
--predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO
bup-midx(1), bup-save(1)
BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown- bup-margin(1)