05-21-2012
Meaning of error-reset-recovery parameter in OK
Hi
Could any one explain the meaning & purpose of below mention parameters in layman term. Suppose if we set below paramet what will happen.
error-reset-recovery=boot
error-reset-recovery=sync
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LEARN ABOUT DEBIAN
bup-damage
bup-damage(1) General Commands Manual bup-damage(1)
NAME
bup-damage - randomly destroy blocks of a file
SYNOPSIS
bup damage [-n count] [-s maxsize] [--percent pct] [-S seed] [--equal]
DESCRIPTION
Use bup damage to deliberately destroy blocks in a .pack or .idx file (from .bup/objects/pack) to test the recovery features of bup-fsck(1)
or other programs.
THIS PROGRAM IS EXTREMELY DANGEROUS AND WILL DESTROY YOUR DATA
bup damage is primarily useful for automated or manual tests of data recovery tools, to reassure yourself that the tools actually work.
OPTIONS
-n, --num=numblocks
the number of separate blocks to damage in each file (default 10). Note that it's possible for more than one damaged segment to
fall in the same bup-fsck(1) recovery block, so you might not damage as many recovery blocks as you expect. If this is a problem,
use --equal.
-s, --size=maxblocksize
the maximum size, in bytes, of each damaged block (default 1 unless --percent is specified). Note that because of the way bup-
fsck(1) works, a multi-byte block could fall on the boundary between two recovery blocks, and thus damaging two separate recovery
blocks. In small files, it's also possible for a damaged block to be larger than a recovery block. If these issues might be a
problem, you should use the default damage size of one byte.
--percent=maxblockpercent
the maximum size, in percent of the original file, of each damaged block. If both --size and --percent are given, the maximum block
size is the minimum of the two restrictions. You can use this to ensure that a given block will never damage more than one or two
git-fsck(1) recovery blocks.
-S, --seed=randomseed
seed the random number generator with the given value. If you use this option, your tests will be repeatable, since the damaged
block offsets, sizes, and contents will be the same every time. By default, the random numbers are different every time (so you can
run tests in a loop and repeatedly test with different damage each time).
--equal
instead of choosing random offsets for each damaged block, space the blocks equally throughout the file, starting at offset 0. If
you also choose a correct maximum block size, this can guarantee that any given damage block never damages more than one git-fsck(1)
recovery block. (This is also guaranteed if you use -s 1.)
EXAMPLE
# make a backup in case things go horribly wrong
cp -a ~/.bup/objects/pack ~/bup-packs.bak
# generate recovery blocks for all packs
bup fsck -g
# deliberately damage the packs
bup damage -n 10 -s 1 -S 0 ~/.bup/objects/pack/*.{pack,idx}
# recover from the damage
bup fsck -r
SEE ALSO
bup-fsck(1), par2(1)
BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown- bup-damage(1)