Yet more reasons to migrate to a 'backup to disk, archive to tape' paradigm

Signed
The Guy Who Just Happens To Work For A Storage Company :)

-----Original Message-----
From: Wes Ono [mailto:wono AT legato DOT com]
Sent: Friday, May 02, 2003 1:16 PM
To: 'Legato NetWorker discussion'; 'lemons_terry AT EMC DOT COM'
Subject: RE: [Networker] Multiplexing and demultiplexing on clones?



To add to Terry Clayton's response:

On a file-type device, savesets are stored in a non-multiplexed way, even if
multiple savesets are concurrently written to the device.  So when you clone
from a file-type device, the output will be non-multiplexed, regardless of
whether you issue a single nsrclone with multiple SSIDs or multiple
nsrclones each having a single SSID.

Or, for those who are more visually oriented:

If data is written to a file-type device as if it were being multiplexed:

        SSID1 SSID2 SSID1 SSID3 SSID2 SSID3 SSID1

It is actually stored as separate savesets:

        SSID1
        SSID2
        SSID3

So when you clone these savesets to tape using EITHER

        nsrclone SSID1 SSID2 SSID3
                or
        nsrclone SSID1
        nsrclone SSID2
        nsrclone SSID3

The output tape will be non-multiplexed:

        SSID1 SSID2 SSID3

Staging behaves the same way as cloning.

Wes

-----


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