Hello,
Can someone please tell me which command to use to determine the available disk space on a given disk device?
I have to write a shell script that compresses files and stores them in a specific location but I am not sure how "conservative" I should be?
Thanks in advance!
Al. (4 Replies)
I am new to being a Unix admin and have a question about replacing some hardware. I have a K class box using HP-UX 10.20 with three disks. Two of the drives are in one logical volume. Every 3 or 4 days, the syslog is showing that one of these drives is experiencing "POWERFAILED" and then recovering... (6 Replies)
Hi people, I have been using my disk for quite a long time but the other day I heard the drive making some noise and had to restart the system again. But when I did that the disk would not boot and I fear that the data might be deleted or lost. So, if you people have any know about the ways to get... (1 Reply)
Hi people,
I have been using my disk for quite a long time but the other day I heard the drive making some noise and had to restart the system again. But when I did that the disk would not boot and I fear that the data might be deleted or lost. So, if you people have any know about the ways to... (2 Replies)
hi all,
have a solaris 9 OS and a SAN disk which used to work fine is not getting picked up by my machine. can anyone point out things to check in order to troubleshoot this ??
thanks in advance. (3 Replies)
in red hat 4, 5 any one know any commands or any scritps to monitor HP DL 380 G5/6 server and trigger alarm when hard disk failed.
thanks for all support
---------- Post updated at 02:45 PM ---------- Previous update was at 12:00 PM ----------
does HP ProLiant Support Pack support is... (4 Replies)
Hello guys,
I have two servers performing the same disk operations. I believe one server is having a disk's impending failure however I have no hard evidence to prove it. This is a pair of Netra 210's with 2 drives in a hardware raid mirror (LSI raid controller). While performing intensive... (4 Replies)
Hi there,
Don't know if my title is relevant but I'm dealing with dangerous materials that I don't really know and I'm very afraid to mess anything up.
I have a Debian 5.0.4 server with 4 x 1TB hard drives.
I have the following mdstat
Personalities :
md1 : active raid1 sda1 sdd1... (3 Replies)
Hi all,
I have encountered the issue with the hard disk, the disk is failed and need to replace by the new one.
As my understanding, this is just to take out the failed disk and insert the new ones, and that's all.
But the third party hardware vendor said, there should be another procedure... (9 Replies)
Discussion started by: Phat
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)