Re: "saving" tapes (or management's ideas...)
1999-01-26 01:59:42
Dwight,
Thanks for your analysis. The problem however, is that I cannot know beforehand
which files would be doomed for non-backup, and these files are scattered
all over the users' filesystems. It is perfectly possible (and this is the
way it probably will be) that in a directory some files will be still in the
normal backup, and others (old ones) to be non-backed up, so wildcarding and
doamins are of little (if any) help. In addition, what would happen once a file
from the "non-backup" is changed and should be backed up ?
Regards,
/Zvika
On Mon, 25 Jan 1999 decook AT amoco DOT com wrote:
> *** numerous include/exclude statements...
> each file on the client is run through (bottom to top) the
> include/exclude list until a match is found. If your hit rate of a
> client file in your include exclude list made a nice bell curve around
> the median entry (which it probably won't since these lists tend to
> EXCLUDE files and any comparisons that purculate out the top are
> included by default) you would have say :
> 10 million client files
> 10 thousand excludes
> nice 50% average hit rate
> yields 50,000,000,000 (50 billion comparisons)
> BUT like I said, mainly excludes with default includes if no match
> found so I'd use 90% for the average excludes compared prior to a
> decision being made so we would have 90 billion comparisons.
> OK, how fast is your CPU ? ? ?
> Still boils down to 0 is way less than 50 billion which is less than
> 90 billion.
>
> That's why there is the "DOMAIN" statements... domains are file
> systems / volumes / (platform specific whatever) and if the fs/vol/xxx
> isn't in the domain, the files within never make it to the
> include/exclude's. 100 files compared in an incl/excl of 101 with the
> top entry being a wildcarded entry to catch all 100 of your compared
> files will still yield 10,000 comparisons just to back up ZERO of the
> files... if the files were all on a single volume and that volume
> wasn't listed in the domain statement... 1 compare would exclude all
> of them (more or less... they wouldn't even be built into the list to
> run through the inclexcl)
>
> this still leaves you with a ton of manual work to seperate & isolate
> data on your client servers...
>
> look at it as job security !
>
> Hope the adsm info is a little help
> later,
> Dwight
>
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