Robert Haeckl wrote:
>
> It looks like mirroring to a hard drive is the most reliable and
> inexpensive way to go. But in a production setting or mission critical
> situations, aren't taped backups and archives still the popular way to
> go to recover from a complete system failure? Mirroring or high
> availability techniques only cover you for disk failure, no?
In "enterprise" settings where backups really are mission-critical and
can cost thousands or millions of dollars a minute while you restore
backups, they have big honking tape robots attached to libraries of
tapes and REALLY expensive and intelligent backup software that
guarantees that even if half your tape library has caught fire and
melted into little plastic pellets, the other half of the tape library
will still contain all the appropriate bits. Sort of like RAID5 for
tapes.
I think most commercial tape backup software does the same sort of
thing, or at least has the option to turn on - it may take you three
tapes to do a backup instead of two, but you have redundant bits on your
tapes in case part of the media is unreadable for some reason.
However, I personally get by with tar and xfsdump and keep my fingers
crossed. :)
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
#!/usr/bin/perl -w
$_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;@t=map
{$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;
$t^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,@z)
[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h=5;$_=unxb24,join
"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$d=
unxV,xb25,$_;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=$t&($d
>>12^$d>>4^$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*
8^$q<<6))<<9,$_=$t[$_]^(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}
print+x"C*",@a}';s/x/pack+/g;eval
usage: qrpff 153 2 8 105 225 < /mnt/dvd/VOB_FILENAME \
| extract_mpeg2 | mpeg2dec -
http://www.eff.org/ http://www.opendvd.org/
http://www.cs.cmu.edu/~dst/DeCSS/Gallery/
This archive was generated by hypermail 2.1.3 : Fri Aug 01 2014 - 20:14:53 EDT