Interesting. Every VTL based solution, including data domain, that I looked at 
had limits on the amount of drives that could be emulated which were nowhere 
near a hundred let alone a thousand. Perhaps it's time to revisit this.

The license is a data domain fee, and a hefty one at that. 

The bigger question I have is since the file based storage is native to TSM why 
exactly is using a file based storage not supported?

~Rick


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Daniel Sparrman
Sent: Tuesday, September 27, 2011 10:30 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Ang: Re: [ADSM-L] vtl versus file systems for pirmary pool

Not really sure where the general idea that a VTL will limit the number of 
available mount points.

I'm not familiar with Data Domain, but generally speaking, the number of 
virtual tape drives configured within a VTL is usually thousands. Not sure why 
you'd want that many though, I always prefer having a small diskpool infront of 
whatever sequential pool I have, and let the bigger files pass the diskpoool 
and go straightly to the seq. pool.

As far as for LAN-free, the only available option I know of is SANergy. And 
going down that road (concerning both price & complexity) will probably make 
the VTL look cheap.

Not sure what kind of licensing you're talking about concerning VTL, but I 
assume it's a Data Domain license and not a TSM license? 

Best Regards

Daniel Sparrman



Daniel Sparrman
Exist i Stockholm AB
Växel: 08-754 98 00
Fax: 08-754 97 30
daniel.sparrman AT exist DOT se
http://www.existgruppen.se
Posthusgatan 1 761 30 NORRTÄLJE



-----"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> skrev: -----


Till: ADSM-L AT VM.MARIST DOT EDU
Från: Rick Adamson <RickAdamson AT WINN-DIXIE DOT COM>
Sänt av: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
Datum: 09/27/2011 16:52
Ärende: Re: [ADSM-L] vtl versus file systems for pirmary pool

A couple of things that I did not see mentioned here which I experienced
was.... for Data Domain the VTL is an additional license and it does
limit the available mount points (or emulated drives), where a TSM file
based pool does not. Like Wanda stated earlier depends what you can
afford !

I myself have grown fond of using the file based approach, easy to
manage, easy to configure, and never worry about an available tape drive
(virtual or otherwise). The lan-free issue is something to consider but
from what I have heard lately is that it can still be accomplished using
the file based storage. If anyone has any info on it I would appreciate
it.

~Rick
Jax, Fl.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Tim Brown
Sent: Monday, September 26, 2011 4:05 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] vtl versus file systems for pirmary pool

What advantage does VTL emulation on a disk primary storage pool have

as compared to disk storage pool that is non vtl ?



It appears to me that a non vtl system would not require the daily
reclamation process

and also allow for more client backups to occur simultaneously.



Thanks,



Tim Brown
Systems Specialist - Project Leader
Central Hudson Gas & Electric
284 South Ave
Poughkeepsie, NY 12601
Email: tbrown AT cenhud DOT com <<mailto:tbrown AT cenhud DOT com>>
Phone: 845-486-5643
Fax: 845-486-5921
Cell: 845-235-4255




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