Read through section 4 of NetBackup Shared Storage Guide  http://www.symantec.com/docs/DOC3659

In short:
Zone all drives to all media servers.
Only necessary to zone robots to one media server (can be master server).
Add Library Based Tape Drive and Shared Storage Option License on all media servers.
Check on master server that all media servers are 'Active for Disk and Tape' with 'nbemmcmd -listhosts -verbose' command.
Run Device Config Wizard - select Robot Control Host as well as all media servers.

How to make a SCAN host for my all shared drives?

The first media server that is started will automatically become the SCAN host.

See 'About scan hosts' in SSO manual (link in my previous post).

For all the drives?IS it recommended that only one scan host for all my 20 drives?

Have you read section 4 of the manual yet?

Yess.But i have nt find my answer.How will i assign all my drives a SCAN host?

You don't, NBU will sort it out.

The only adjustment sometimes suggested when there are many media servers, and I will admit to not knowing what this number is, but I suspect it is more than 6, is to set the 'scan ability' value of one server to 9, and the others to 5.

Persoanlly, I would leave it at defaults unless there is an issue.

Martin

I was hoping that this section in the manual would answer your question:

1. From where i need to  run the Device Wizard?Master or media server?
2. ,Do i get the option of making master server as Robot control host?
3. When My first backup runs from media server A and it goes to drive B.So Drive B will be assigned a scan host A.When this drive is used by media server B ,then what will be the scan host?

1. Master

2. Best to first select Master only. This will ensure that Master is Robot Control host.
Run Device Config Wizard again, this time selecting Master and all Media servers.

3. SCAN host has nothing to do with 'Reserved' host (host using tape drive). Please read section 'About Scan Hosts' again.
If it still does make sense, wait till all is configured. Run 'vmdareq' command (in volmg/bin) on master server when no backups are running and when backups are running. All will be clear when you see the output.

Example of vmdareq output:

Why are you so concerned about the scan host - leave NBU to it, it will work fine.

It's all exaplined in the SSO guide.

Martin

@Martin.Thanks.

One more doubt:

When i run the device wizard, where do i have the option to select my robot control host..If some screenshot can be provided.That may be useful

Hi,

Please provide some info

On the screen in the gui where you select the hosts to scan, select your media server(s) and just make sure you select the robot control host as well.

M

When i run the DCW,i can see my one master server and 6 media servers.

Now what to do next to make my master server as Robot control host

Now what to do next to make my master server as Robot control host

I have answered this question yesterday:

2. Best to first select Master only. This will ensure that Master is Robot Control host.
Run Device Config Wizard again, this time selecting Master and all Media servers

so you mean to say that I should only check master server name first and run the wizard?next next next

Thanks Marianne.

If i want one of my media server to be robot control host then?

Then you first select the media server only. Finish config and restart services/daemons - same as previous post where master server was selected.
Next, select robot control host and all other servers sharing the tape drives.

If only one server can see the robot, then this will be the robot control host when the servers are scanned.  Perhaps Marianne knows something I don't (quite possible ...)  - I can only think scanning the RCH separately is required if multiple servers can see the robot.  However, as Marianne pointed out above, only one server should be allowed to see the robot at any one time.

If you want a media server to be the RCH, just configure the san so that only that media server sees the robot.

It makes the most sense for the master to be the RCH, as the master has to be available, then the RCH will always be available, if a media server is the RCH and goes down, the remaing media severs cannot function.

Martin

Start device config wizard and select the server that you want to be the robot control host (no other media server(s)). Configure this server only and allow the wizard to restart services/daemons.

If with my master server 2 drives are attached yhen this will also be configured?Correct?

And 2nd time when i run the wizard and check master server?Will anything happen?

Yes the drives will be configured also, unless you delect them.

2nd time, it will just reconfigure them.

When don't you just try it and see ...