While I was reading a Sun SysAdmin Guide, I came across this point...
/etc/vfstab Field Descriptions
mount at boot -
The root (/), /usr and /var file systems are not mounted from the vfstab file initially.
This field should always be set to no for these file systems and for virtual file... (2 Replies)
Hi
can anybody help me when i boot up my machine the LED runs until it gets to 406coch6 and it simply stops their
noting appears on the screen...?
Is their a website that lists all the codes and their meaning
Thanks
Liam (2 Replies)
hi guys,
i have 2 hp-ux servers at my office with flashing system LED.
am very new to hp-ux...no much of access directly to the server.
how can i check for faults relating to this flashing of this system LED?
the DC is pretty far from my office...all i have is an ssh access into the server.... (4 Replies)
When I import VG, it shows:
0516-622 synclvodm: Warning, cannot write lv control block data.
I found AIX V4.3 have updatelv command can recovery LVB from VG, however, updatelv is not existed on AIX 5L, which command to replace it? (2 Replies)
We use HMC to manage two logical partitions. LPARs don't have any problem but HMC's, itself, attention led is on. :eek: I am not sure if that's going to affect LPARs, but just wanted to be sure.... :confused:
Has anyone come across such problem on HMC?
Where can you suggest to look for logs... (1 Reply)
Simple question: on hmc i can use lsrefcode to see led status
of panel,currently display 01 N V=F T
On aix without hmc,is possible to see actual led status of my workstation?
I don't have hmc currently
Thanks (3 Replies)
Hi, I am trying to switch from windows to linux.
I have been using Autohotkey scripts for some little things.
I started writing some bash scripts for NEMO browser in linux mint and I am trying to convert some of AHK scripts but as I am not a programmer. I have a hard time with regex stuff.
... (3 Replies)
Discussion started by: Bishop
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)