Hello,
how can I detect the nr of cpu of my SUN E250 Solaris server? I have tryed with top but I was not able to find the information.
Thanks. (1 Reply)
hi
is it possible to have more than one file system types on the same file system.
if yes then how do we do it,
can veritas be used to achieve this (1 Reply)
How do I know what type of shells are available in my Unix system? Are there a single command or environment variable that can let me find that out?
Best regards,
John Chan (7 Replies)
Hi all,
How to find out what type of file system is my system configured for Red hat linux 8.0 ? whether it is NTFS or FAT32 or FAT16...
Can somebody help me on this?
Regards,
William (4 Replies)
Hi all,
How to findout the file sytem type which is NFS and which is Local?
Suppose i have 5 different folders my in Root directory. dir 4 and 5 are mounted on different file system and dir 1,2 and 3 are mounted on different fild system
Now i wanted know which file sytem is Local and which... (1 Reply)
Good day
I need create new mount points on a server. I'm not very familiar with HP-UX and was given steps on how to go about doing the mounting, etc.
Before I start though, I need to determine which file system type is currently being used. This will determine whether i need to extend the... (3 Replies)
Hi All,
I am new to AIX, not completly though.. I got a task to install AIX 5.2 on 'IBM system p5 type 9110-51A' server. I tried few things, but i am not able to get to the console of this server to proceed with the installation. I have installed AIX 6.1 earlier, but those servers can be plugged... (4 Replies)
Hi,
I need a script that needs to detect the Operating System and based upon wheter it is Linux, Solaris x86, Sparc, Itanium etc it should populate "ps" command with detailed output accordingly
for example:
ps -xef | grep java -> Itaniumps -auxwww | greap java -> Solaris (9 Replies)
Discussion started by: mohtashims
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)