Andrew,

What is unclear is what you want to do with the disks.

Are you planning to do disk only backups or Disk first and then stage to tape?

There are limits on advanced file devices (as have been explaind before on 
this list). If a file device is full any running backup stream will not 
switch to a new disk automatic but will wait until space is availible on the 
original target disk.

So in general (but your situation may differ) it is best to make a big single 
volume. But many more performance related issues play a role here too.

Adv file devices can do read and write at the same time (with limits of 
course). Basically this means backups and staging can run at the same time. 
Or backups and recovers if the disk is used as a holding place for backups 
for some time.

Many issues depend on what your targets are and how much data and how much 
time you have for backups and restores. 

I use disk backup only on a small scale for backing up laptop users during the 
day when my tapes are busy doing cloning. 18Tb of data is big for me so my 
advice could be wrong for your situation.

A more complete picture is helpful for better advice.

Maarten


On Wednesday 21 September 2005 11:28, you wrote:
> We currently have around 18TB of Disk, split up into 20 devices on
> networker. I have expired and disabled 13 TB of disk so networker cannot
> use them currently to enable us to change to AFT devices. What is the best
> way to apply AFT devices to our set-up, do you have one big Volume that is
> 13TB in size if so do i need to do anything different to your instructions
> below. Any help is much appreciated.
>
> Regards
>
> [IMAGE]
>
> |+---------------------------+--------------------------------------------|
> |
> ||   "Maarten Boot           |                                            |
> ||   (CWEU-USERS/CWNL)"      |           To:        "Legato NetWorker     |
> ||   <[email protected]|   discussion"                              |
> ||   re.com>                 |   <NETWORKER AT listserv.temple DOT edu>, 
> "Andrew |
> ||
> ||                           |   Bridgeman"                               |
> ||
> ||   21/09/2005 10:08        |   <andrew.bridgeman AT corusgroup DOT com>     
>    |
> ||
> ||                           |           cc:                              |
> ||                           |           Subject:        Re: [Networker]  |
> ||                           |   Resource/Guide/Link on applying Advanced |
> ||                           |   File Type Devices                        |
> |
> |+---------------------------+--------------------------------------------|
>
> As far as I remember it is nicely explained in tne admin guide.
>
> Anyway question 1 is always: Do you have the proper license. Tier 1 is if I
> recall well up to 1 Tbyte.
>
> After that its easy: (using the Unix Gui on 7.1.3)
>
> Media -> device -> Create:
>
> set the type to adv_file
>
> set the name to an existing directory like: /big/1
>
> and press apply
>
> You now have a adv-file device.
>
> Now label a volume from a pool there ( I use the default pool here )
> The pool in my case is not used for anything else otherwise there is a
> conflict where the data should go (tape or disk).
>
> after that you have a volume like Default.001.
>
> Direct some of your backups to go to this pool and switch on staging from
> this
> devices to a target tape pool.
>
> Please check the steps by reading the Admin manual
>
> Maarten
>
> On Wednesday 21 September 2005 09:45, Andrew Bridgeman wrote:
> > Could someone tell me where i can get instructions on how to apply
>
> Advanced
>
> > File type devices to my Networker set-up.
> >
> > To sign off this list, send email to listserv AT listserv.temple DOT edu and
>
> type
>
> > "signoff networker" in the body of the email. Please write to
> > networker-request AT listserv.temple DOT edu if you have any problems wit 
> > this
> > list. You can access the archives at
> > http://listserv.temple.edu/archives/networker.html or via RSS at
> > http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
>
> --
> Maarten Boot,
> Compuware Europe B.V.
> Hoogoorddreef 5
> 1101 BA Amsterdam
> Tel: +31 20 312 6511
>
>
> (Embedded image moved to file: pic11023.jpg)
>
> **********************************************************************
> This transmission is confidential and must not be used or disclosed by
> anyone other than the intended recipient. Neither Corus Group Plc nor
> any of its subsidiaries can accept any responsibility for any use or
> misuse of the transmission by anyone.
> **********************************************************************

-- 
Maarten Boot, 
Compuware Europe B.V.
Hoogoorddreef 5
1101 BA Amsterdam
Tel: +31 20 312 6511

To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type "signoff networker" in the
body of the email. Please write to networker-request AT listserv.temple DOT edu 
if you have any problems
wit this list. You can access the archives at 
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER