As I said in a prior post... I'm not sure if you would technically call
it multiplexing(only one stream of data from nsrclone), but if you pass
a list to nsrclone that contains more than one ssid on a single volume
the multiplexing of those ssids will remain.

Example

----Start ssidlistfile----
2222222222
4444444444
6666666666
----End ss-dlistfile

Original volume contains ssids

1111111111
2222222222
3333333333
4444444444
5555555555
6666666666

$ nsrclone -v -b clonepool -S -f ssidlistfile

If the chunks on the original tape are laid out like this(very simple
example):

[111...][222...][111...][222...][333...][444...][111...][222...][333...]
[444...][111...][555...][222...][333...][111...][444...][666...][222...]
[333...][111...][666...]

Then I believe the chunks on the clone tape will be:

[222...][222...][444...][222...][444...][222...][444...][666...][222...]
[666...]

I'd loved to hear a Legato person chime in here to verify or correct
what I'm saying?!?!

Hope this helps,

Joel






-----Original Message-----
From: Gaddy [mailto:xy.0815 AT GMX DOT NET] 
Sent: Tuesday, April 22, 2003 1:30 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Merits of cloning versus dual backups?

enclosed some cloning principles we use:

1st: we backup to multiple pools
   (i.e. Oracle to OraclePool, Notes to NotesPool, other to Default)
2nd: we clone all the backups to ONE clonepool
   reason: we have to move not that much cartridges!
   (the so called "volume cloning" is no help here,
     one input tape --> one (ore two :-) output tapes)
3rd: we send cloning volumes offline (!near)
    reasons: - it gives me a much better feeling to RECOVER
             from verified tapes instead of sending them
             offline for "disaster recovery"
             (it's quite possible they never get used) but ... :-(
             - there had been (?) an issue, that NetWorker
             accepted the clone saveset ONLY, if the original
             had been marked "suspect"
             (but this seems to be gone away, if I understand this
thread
              correctly)
4th: we only return cartridges which have been already recycled
      (i.e. mminfo -q volrecycle -q !near -r volume)

But one question seems to be still open:
Does cloning some kind of de-multiplexing or not?

Regards -sg-
--
Steffen Gattert; MOMENTUM Systech Hamburg

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