When I create filesystems in AIX i often get confused(using smit)
When you specify size in aix, it is asked like this
SIZE of file system (in 512-byte blocks)
I never seem to grasp this, what is the equation to get say
500mb? Or is there a program anyone knows of that does this, like a... (1 Reply)
I want to convert string into uppercase string. How can i do that ? Ex: Enter the user name:
read name
show=upper(name)
echo $show --- This output should be the uppercase output.
Thanks (3 Replies)
Hi all,
i am trying to use C in unix platform to convert a double variable (floating point) to a string variable.
i tried using sprintf, ecvt, fcvt,gcvt.
but all gave me funny output or altered the content.
does anyone know how to convert the data and keep the original content.
for... (3 Replies)
I use Sco_Sv 3.2v5.0.5 with parellel conection using dump terminals and i want to convert them to desktop pc.
Anybody knows what hardware and other thing that would be involved? (3 Replies)
Hi - I have seen some similar posts but I am a bit stumped here
below is the first line of a 'od -c filename' command. I want to change the \0 to \n
0000000 l s \0 c d - \0 c d . . \0 l s
I have tried a sed construct in a script.........
sed... (2 Replies)
Hi All,
I am checking for a empty input file to do some further action , but I am getting exit status 0 in both the cases , for empty and non empty file both.
The value of $? is coming 0 in if part also and else part too.
#!/bin/ksh
if ]; then
echo "data"
# exit 0
echo "$?"
else... (4 Replies)
I have Excel file with the below three columns, i need your expertise in converting this to .csv file delimiter "|"
Excel -
Serial Number Serial Name Serial Brand
111 test sample
123 test2 sample1
134 ... (9 Replies)
Discussion started by: kiran_hp
9 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)