[OpenAFS] TSM client for OpenAFS

Kristen J. Webb kwebb@teradactyl.com
Fri, 03 Apr 2009 14:34:13 -0600

Mattias Pantzare wrote:
>>>> Of course, but it will still take up much more space. If we do full dump
>>>> once a week
>>>> and incs each night there will be many duplicates of files changed early
>>>> after the full dump :-)
>>> Do I correctly infer that you don't need a full backup as in "ability to
>>> restore data from arbitrary points in time"?
>> Well, TSM only store one copy of a specific object, while if you do full
>> dumps + incs
>> there will be multiple copies.
> Just to be clear, TSM stores one copy per version of a specific object.
I believe that the path name to the object is part of it's uniqueness.
It is my understanding that if you rename a directory, that all of the
files and directories below it will need to be backed up again
even if they have not changed.
> If we do full dumps + incs we have to have at least two full dumps in
> the backup system at a given time.
> If we do it the TSM way only one copy have to be in the backup system
> if the file is static.
> We do need ability to restore data from arbitrary points in time. (I
> work at the same place as Anders)
With TSM file mode, you can only restore to points in time
based on the number of file copies you maintain (e.g. 10).
So if a single file changes in a volume every day, you can
only do a complete restore up to 10 days back.  Volume mode
dumps allow you to do complete restores going back
further based on the retention policies for your various
backup levels.

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Mr. Kristen J. Webb
Teradactyl LLC.

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EMAIL: kwebb@teradactyl.com
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