I have COMPAQ DS 20 SERVER, During The Boot Process, There is an ERROR MESSAGE :
malloc_mem_alloc : no space in map.
AND the system can't boot , And i can't do anything.
The server display : malloc_mem_alloc and the unique thing i can di is to restart the server with i/o buttom.
HELP ME... (1 Reply)
To All:
I have this AIX machine (see boot process below). The problem was it hangs at:
The ctrmc Subsystem has been started. Subsystem PID is 11906..
I checked with other forums but their advise were just "strong punches in the air" with no specific explanation.
I really appreciate if... (6 Replies)
Good afternoon,
I'm currently working on an IBM 9110-510, with an AIX 6.1 on it.
Currently, I've put an HyperTerminal on the machine vty0. Folowing the procedure given by a support guy(§details), I'm able to get to the AIX banner
... (6 Replies)
Afternoon all, hopefully someone can give me a hand with this (the following may be explained very poorly :rolleyes: )
I know there's a process running on one of our Solaris 10 boxes that runs approximately every 5 minutes. Unfortunately I've no idea, who owns it, what it is called, or how it is... (2 Replies)
Hi All,
I have to kill a program whose pid, i will be getting.
Multiple processes will be getting started by my script of same kind in a series.
So for after each call to a process i need to write a command or script which can kill the process if it takes more than 5min. In this i will... (3 Replies)
Hi, i want that the parent process start before the child, this code doesn't work,
if the child start before the parent it wait for signal, then the father send the signal SIGALRM and the child catch it and call printf;
else the father call printf and send the signal to the child that call its... (1 Reply)
I understand the OBP program looks for the boot-device, loads the bootblk (located on physical disk sectors 1 through 15). Then the secondary boot program, /platform/`arch -k`/ufsboot is run. This program loads the kernel core image files (genunix and unix).
So how does it uses the ufsboot and... (1 Reply)
This is on a CentOS box, I have two scripts that need to run in order.
I want to write a shell script that calls the first script, lets it run and then terminates it after a certain number of hours (that I specify of course), and then calls the second script (they can't run simultaneously) which... (3 Replies)
Discussion started by: btramer
3 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)