[OpenAFS] Incremental backups
Kristen J. Webb
kwebb@teradactyl.com
Fri, 25 Apr 2008 14:01:31 -0600
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Stephen Joyce wrote:
>
> One other thing to be aware of is that giving the -time option to vos
> dump makes it look at the files' modification timestamps to determine
> what to back up. It's very possible to create a file with an old
> timestamp (using tar, touch, etc) so that it won't be caught by anything
> except a full backup. Mv'ing a file between volumes is an easy way to
> accidentally cause this. Just something to be aware of.
The vos dump process does not look at unix time stamps to determine
if a file needs to be backed up. This is a nice feature of AFS.
Any modification to the volume updates the volume time stamp, and
if you keep track of these correctly, you'll get the new data even if
the unix times would not predict that.
I cp -p /usr/bin/filesize to my afs volume. As you can see
it is all of the unix times are from 2000:
# stat filesize
File: `filesize'
Size: 68 Blocks: 2 IO Block: 4096 regular file
Device: dh/13d Inode: 80281630 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2000-09-04 11:24:42.000000000 -0400
Modify: 2000-09-04 11:24:42.000000000 -0400
Change: 2000-09-04 11:24:42.000000000 -0400
I then took an incremental backup of the volume and checked our
file lookup database and the file is there:
FILE 68 Mon Sep 4 11:24:42 2000 afs|user.kwebb|/filesize
If vos dump did not give us these older files consistently,
our synthetic backup process would detect it.
Kris
--
Mr. Kristen J. Webb
Teradactyl LLC.
PHONE: 1-505-242-1091
EMAIL: kwebb@teradactyl.com
VISIT: http://www.teradactyl.com
Home of the
True incremental Backup System
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