As with any OS that's capable, AIX and NT both allow ACL's and long paths;
I think TSM database has room for 160 bytes, then (if exceeded) goes to
storage pool. They are more prevalent in our NT systems, probably because
our AIX is predominantly used as the TSM server platform (so its security
structures and file systems tend to be more simply defined than a system
being used as a file & print server).
You can see this in action if you query the node's filespaces after
generating backup data; the list reveals what storage pool holds how many
files, etc. Also, making the DIRMC pool small (say, 5 MB) and giving it no
migration pool may reveal the following problem...
BTW, last time I checked, there was still a problem with allocating space;
the server wants to pre-allocate transaction space for "clumps" of data, so
requests enough storage pool space to hold the maxtransbytes (TXNGroupmax) -
if that's not available, the transaction will fail (even though it will not
use the requested MB, that might be what it requests... so, I just allocate
500 MB for the DIRMC primary (on disk) storage pool. If that still causes
transaction failure (due to config parms asking for large "clumps") a
simple-minded work-around is to define a migration storage pool that has
lots of space available.
Don France
Technical Architect - Unix Engineering/P.A.C.E.
San Jose, CA
mailto:[EMAIL PROTECTED]
PACE - http://www.pacepros.com
Bus-Ph: (408) 257-3037
-----Original Message-----
From: William Boyer [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, November 22, 2000 12:17 PM
To: [EMAIL PROTECTED]
Subject: Re: DIRMC - disadvantages only?
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:[EMAIL PROTECTED]]On Behalf Of
arhoads
Sent: Wednesday, November 22, 2000 11:10 AM
To: [EMAIL PROTECTED]
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
