ADSM-L

Re: DIRMC - disadvantages only?

2000-11-22 14:37:29
Subject: Re: DIRMC - disadvantages only?
From: arhoads <arhoads AT PACBELL DOT NET>
Date: Wed, 22 Nov 2000 11:09:36 -0500
And this goes along with my understanding which is that DIRMC was
invented solely for the purpose of segregating Novell backups since the
programmer on that client 'for some reason' didn't use the TSM (then
ADSM) database to store the directory structure but put it in the same
location as the file contents.  DIRMC therefore is a performance
optimization for Novell clients and (per my understanding) only works
for Novell clients.

Steffan

Richard Sims wrote:
>
> >When I issued a restore for any given FS, all of the dirs were recreated
> >(restored) WITHOUT any tapes being called for.  The first mount didn't
> >occur until a data file was needed.
> >
> >Signed confused.    :-<
>
> Jochem - I think you missed some postings...
>          In file system types where the directory structure is simple, *SM is
> able to store the directory attributes, need to reconstruct it, solely within
> the *SM database, same as it does with empty files.  Only if the otherwise
> simple object is accompanied by an Access Control List does it involve so much
> information that it has to be stored in a storage pool.  That's the beauty of
> simpler file systems: your directory structure can be restored immediately, 
> with
> no media mounts.  This is generally the case in Unix systems, as your AIX.
>
> I summarize this in my  http://people.bu.edu/rbs/ADSM.QuickFacts, under
> "DIRMc".
>
>    Richard Sims, BU
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