Tom Fitzgerald wrote:
Can someone confirm that my assumptions about incremental AFS backups are correct? 1) Aside from needlessly increasing the size of the dump, there's no harm in setting the -time of an incremental dump to be substantially earlier than it needs to be.
In my experience, you are correct.
2) If I do a "vos backup X" and later a "vos dump X.backup", then later a incremental dump, the -time in the incremental dump should be the time of the first "vos backup" (or earlier), notthe full "vos dump".
Yes, but before you do the incremental dump, you need to do another vos backup ;) Depending on your incremental strategy there are a few more issues to consider. If your incrementals are partial (e.g. changes since the last incremental backup) then you need to ensure that the vos backup before each incremental actually works, or you may create a "hole" in your backup data. We also ran into problems with time between running on the command line vs. cron. Our software compares time stamps in the vos dump headers to avoid these types of problems. If your incrementals are cumulative (e.g. changes since the last full), then if any given vos backup fails, the next incremental will simply be another copy of the previous incremental. You will miss that days changes. As long as the vos backup problem does not persist, your next backup should "catch up".
3) vos dump X "01/01/2008" is the same as vos dump X "01/01/2008 00:00"
This seems to be correct. I ran two test dumps and used our afsvcheck program to look at the dump header. vos dump vol.backup -time "04/24/2008" -file 1 afsvcheck -f 1 -v | grep From From [0] = 1209009600: Thu Apr 24 00:00:00 2008 vos dump vol.backup -time "04/24/2008 00:00" -file 2 afsvcheck -f 2 -v | grep From From [0] = 1209009600: Thu Apr 24 00:00:00 2008 Which also makes sense intuitively. Kris
In honor of the Evansville, IN school district which lost four weeks of high school grade information due to "an unfortunate and very rare combination of hardware problems and backup configuration settings", I'm sanity-checking all my backup scripts. Thanks for any info. _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info
-- Mr. Kristen J. Webb Teradactyl LLC. PHONE: 1-505-242-1091 EMAIL: [EMAIL PROTECTED] VISIT: http://www.teradactyl.com Home of the True incremental Backup System
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