Date: Sat, 20 Apr 1996 08:13:48 -0600 From: Sean Kelly <kelly@fsl.noaa.gov> To: narvi@haldjas.folklore.ee Cc: questions@freebsd.org Subject: Re: Dump Message-ID: <9604201411.AA14110@fslg8.fsl.noaa.gov> In-Reply-To: <Pine.BSF.3.91.960420161452.5297A-100000@haldjas.folklore.ee> (message from Narvi on Sat, 20 Apr 1996 16:18:05 %2B0300 (EET DST))
next in thread | previous in thread | raw e-mail | index | archive | help
>>>>> "Narvi" == Narvi <narvi@haldjas.folklore.ee> writes:
Narvi> starting with 1 are incremental. The question is - what is
Narvi> the actual difference between levels 1, 2, 3, ... 9?
The difference when level n = [1..9]: files that have changed that
were last dumped on level n will be dumped on levels <=n. Files that
haven't changed that were dumped on level n won't be dumped on levels
>n. When n = 0, everything's dumped.
So, what n you pick doesn't matter. The relative n's do.
For example, at one site, we did level 0 at the end of every month.
Every night except Saturday we did level 9. And Saturday nights we
did level 5.
If there was a catastrophic disk failure on 17 April 1996, we could
rebuild the filesystem to the last day by accessing these dumps:
starting with the level 0 done on 31 March to bring the filesystem
up-to-date with respect to the month, then the level 5 done on 13
April, do bring it up-to-date with respect to the week, then the level
9s on the 14, 15, and 16th to get the daily changes.
--
Sean Kelly
NOAA Forecast Systems Laboratory kelly@fsl.noaa.gov
Boulder Colorado USA http://www-sdd.fsl.noaa.gov/~kelly/
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?9604201411.AA14110>