02-19-2012
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
In Unix, I am having one file getting copied to some directory. Which command will help me ensure, that file is not completely copied to the disk? (2 Replies)
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2. UNIX for Advanced & Expert Users
Hi,
We have some clients who will place huge files in to one of the remote server.
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Hello everyone, I'm a newbie.
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4. UNIX for Dummies Questions & Answers
I need my code to compare two different files that are in two completely different directories, How can I do this?
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5. Shell Programming and Scripting
Dear All,
I am using find command
find /my_rep/*/RKYPROOF/*/*/WDM/HOME_INT/PWD_DATA -name rk*myguidelines*.pdf -print
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6. Shell Programming and Scripting
i am trying to recursively save a remote FTP server but exclude the files immediately under a directory directory1
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8. UNIX for Beginners Questions & Answers
Hi,
I am using following command to find a specific file.
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Hi
i am really new to linux scripting and i need a little bit help.
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10. UNIX for Advanced & Expert Users
I am using aix. I would like to ignore the /u directory. I tried this but it is not working.
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/u/arch/vim.rpm (4 Replies)
Discussion started by: cokedude
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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)