I am a bash shell programmer and I create programs on occasional basis.
Now, I dont want my programs to be run by typing out its name at a command line. I want to make it as user friendly as possible. I want to create icons on the desktop so users can click on it. mind you, I said "desktop... (7 Replies)
Hi,
While I am trying SFTP my machine to another unix machine ,
it was working fine till 10 min back.
But now i am getting the below error
"Request for subsystem 'sftp' failed on channel 0"
Could you please someone help me to solve or analyise the root cause...
Cheers:b:,
Mahiban (0 Replies)
Hi,
i got the following error when i tried to access the cygwin x server from a windows XP PC.
"xdmcp fatal error session failed session 23 failed for display"
Alternatively, when i tried to access the same Cygwin X Server from another windows XP PC which is on a different LAN... (3 Replies)
In AIX 5.1, a daily run script that backing up oracle data failed yesterday with following errors:
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first off let me introduce myself. My name is Eric and I am new to linux, I am taking an advanced linux administration class and we are tasked with creating a script to add new users that anyone can run, has to check for the existence of a directory. if the directory does not exist then it has... (12 Replies)
All,
I hope someone can help me on my problem with an aggregate, as I am a Solaris noob. I tried doing this according to the official documentation from Oracle (unfortunately, as a new user to the forum, I may not post URLs...) and also googled a lot around, but have not found any solution yet.... (15 Replies)
Hello Group,
I tried to enable the net1 interface under Solaris 11 and I see a flag related with a ipmp failed. Now this interface is not set to any ipmp group.
I would appreciate it your help
dladm show-phys
LINK MEDIA STATE SPEED DUPLEX DEVICE... (3 Replies)
HI,
I have two Linux servers on which IBM Sterling ConnectDirect is installed. I want to transfer a file from server(abc20) to abc19.
I have edited userfile.cfg & netmap.cfg on both the server still file transfer is not happening. Also the file is getting transferred from abc20 to abc20 itself... (5 Replies)
I have created one file that contains all the necessary info in it to create a download link. In each of the lines /results/analysis/output/Home/Auto_user_S5-00580-6-Medexome_67_032/plugin_out/FileExporter_out.67... (8 Replies)
Discussion started by: cmccabe
8 Replies
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)