>What bothers me about (3) is the VMD5_DIGEST line which appears at the
>bottom. On 5 Oct 2000, Jeff.Holmbeck AT veritas DOT com wrote
>
>> VMD5_DIGEST is a checksum of the file. If the checksum doesn't match
>> the contents of the file, NetBackup will assume the file is in error
>> and will attempt to "auto-correct" the values.
>
>... which confuses me. Does this mean it will auto-correct the checksum?
>Because if so, what was the point of having it in the first place? Or does
>it mean it will auto-correct the details of the clients, which I wouldn't
>have thought was possible from an MD5 digest?? Or what?
I think you are correct, the MD5 checksum is auto corrected. The checksum
gets generated anytime any changes are done. I dont see any harm in
reordering the clients, also this is a simple MD5_DIGEST checksum which
you can generate on your own and append it.
Example below straight out of Digest::MD5 pod2man, with some modifications
I made
#!/usr/local/bin/perl
use Digest::MD5;
my $file = shift || "/tmp/test";
open(FILE,$file) || die "Can't open '$file': $!";
binmode(FILE);
$digest=Digest::MD5->new->addfile(*FILE)->hexdigest;
$digest=~s/(\w\w)/\1 /g;
print "#VMD5_DIGEST=$digest\n";
Here's a checksum correction before and after reordering clients in a
simple test class I have
#./md5test.pl
#VMD5_DIGEST=55 46 1e 2c 1f ae 00 ed c1 03 0c 75 b9 df eb c1
After reodering clients file
#./md5test.pl
#VMD5_DIGEST=78 01 53 4a be 00 38 b5 a7 74 86 a9 09 47 ce ae
-ravi
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