ADSM-L

Re: DIRMC - disadvantages only?

2000-11-22 22:11:22
Subject: Re: DIRMC - disadvantages only?
From: arhoads <arhoads AT PACBELL DOT NET>
Date: Wed, 22 Nov 2000 15:16:35 -0500
Bill,

where did you get that info?

Steffan

William Boyer wrote:
>
> No. DIRMC is used for directories in OS's that have ACL (Access Control
> Lists) assigned. Like NT permissions. The WIN32 client on NT will use DIRMC
> as well as the Netware clients. If the OS doesn't have ACL's associated with
> the directories, then the information is kept in the TSM database only.
> Win9x doesn't use the DIRMC.
>
> Bill Boyer
> DSS, Inc.
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
> arhoads
> Sent: Wednesday, November 22, 2000 11:10 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: DIRMC - disadvantages only?
>
> 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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