Video Screencast Help
Symantec to Separate Into Two Focused, Industry-Leading Technology Companies. Learn more.

Volume groups, Stand-alone volumes

Created: 01 Sep 2010 | 11 comments

Hello

Sorry for my misunderstaing on the topic.
 
I’m not really grasping it.  What exactly are volume groups used for?  Even after reading the section of the admin guide i'm still confused.
 
“Volume groups show the location of a volume”
 
Just clicking on the robot shows me what tapes it has available so why do we need volume groups as well?
 
Volume groups let you perform operations on a set of volumes by specifying the group name rather than each individual media ID of each volume. Operations include moves between a robotic library and a stand-alone location or deletetions from NetBackup”
 
Considering what’s written above, if I physically move a tape from one robot to another, wouldn’t inventorying the other robot automatically remove it from the old volume group and place it in the new one belonging to that robot?  In which case why would I need to perform a separate move operation between volume groups?
 
“More than one volume group can share the same location. For example, a robotic library can contain volumes from more than one volume group and you can have more than one stand-alone volume group.”
 
When would you have more than one volume group sharing a single robotic library and how is this set up?
 
My final question I promise -  What exactly are stand-alone volumes?

JB

Comments 11 CommentsJump to latest comment

J.H Is gone's picture

I have two volume groups  standalone and in the robot.

I never touch the volume groups, NB takes care of that.
I just add and remove media and have it to go the pool I want, NB takes care of the group.

As to standalone.  that is any tape this is NOT in the library.

If you eject a tape from the library it goes to standalone status.

A tape in standalone status could be put into a standalone drive.
I have one drive outside my robot (SDLT) this is where I put my tapes that have DLT as their type. So here I am putting a standalone tape into a standalone drive.

If you right click a tape and do move, you can move it to standalone status while it is still in the library.  This is used sometimes when updating a robot.  Then when done, the next time you inventory it comes back as being in the robot and follows rules to what pool it goes into.

I don't have to know how to spell....I work on Unix.
NetBackup 7.0.1 - AIX & Windows

JBiggins's picture

Great, I get it.  Thanks a lot J.Hinchcliffe

Deepak W's picture

Just clicking on the robot shows me what tapes it has available so why do we need volume groups as well?

You are only thinking from one robot perspective, think when you have huge environment and you have to manage hundreds of tapes, that time it is very complex / tadeous to work on individual media level. That time volume groups help you to do media operations on group of media at a time instead of changing individual media attributes. 

by default NBU assigns media into volume group which is created for respective robot.

Considering what’s written above, if I physically move a tape from one robot to another, wouldn’t inventorying the other robot automatically remove it from the old volume group and place it in the new one belonging to that robot?  In which case why would I need to perform a separate move operation between volume groups?

by doing this you are talking to manually remove one media from library and insert into other. Practically doing this very quite tough / time consuming and again on individual media level. By using volume groups, if required, you can move all tapes from one volume group to other.

When would you have more than one volume group sharing a single robotic library and how is this set up?

Practically I never had to setup manually, but as per the NBU CMD reference guide you can create new volume group using vmchange command with 
-new_v volume_group switch. Check the guide for more details on this.

 What exactly are stand-alone volumes?

These are the volumes which contains media which are not manged by robots. For example tapes which are being read from standalone tape drives (not tape library)

Husshhhh.... :)

Hope this information helps to resolve your queries.

And we appreciate that you read the documentation and tried to understand the product first prior asking questions :)

Close this thread if your queries are answered.

-- Deepak W (Kindly close the thread if your query is resolved)

JBiggins's picture

Thanks a lot for your help Deepak W, I wish I could have replied sooner.

by doing this you are talking to manually remove one media from library and insert into other. Practically doing this very quite tough / time consuming and again on individual media level. By using volume groups, if required, you can move all tapes from one volume group to other.

I’m still not sure I’m understanding this bit though.  If I had to put the tapes into another robot for whatever reason, then inventorying the robot would automatically put them in the new volume group anyway.  So using the change volume group method in the gui or cli seems a little pointless if the inventory takes care of this part anyway.

JB

Deepak W's picture

Oops ... I think I took much time in typing :)

-- Deepak W (Kindly close the thread if your query is resolved)

Will Restore's picture

we use volume groups when tapes are removed from the library, i.e. set volume group=safe or offsite or whatever to easily identify the physical location.  never tried using multiple volume groups within the library.

Will Restore -- where there is a Will there is a way

JBiggins's picture

Thanks wrobbins

So if tapes are removed from a library could they be automatically moved into a volume group called “offsite” or is this a manual process?  I’ve noticed when tapes are removed from the robot they go into a volume group called “---“.  If this is possible, and the tape is injected back into the library at a future time then ejected again, will it fall back into the offsite group?

JB

Will Restore's picture

default is "----" so we set it upon eject with vmchange -res -multi_eject -v offsite ...
when reinjected it changes automatically to volume group 000_0000_TLD

Will Restore -- where there is a Will there is a way

J.H Is gone's picture

so it looks like wrobbins has made a specail group for offsite.
Were I just let mey ejected tapes go to the standard "standalone" group ( --- ) meanin "not in robot"

I don't have to know how to spell....I work on Unix.
NetBackup 7.0.1 - AIX & Windows

JBiggins's picture

Thanks a lot wrobbins and J.Hinchcliffe for taking the time to clear this up for me.  I now have a better understading. 

The only bit I'm still not 100% on is my last question put to Deepak.  It's nagging me, can anyone help.

JB

J.H Is gone's picture

He may be talking about have more then virtual library in physical robot.

I have a TS3310.  At the moment I have 1 virtual library defined  so I put all my tapes in that library and I SSO out my drives.

Now I could create 2 virtual libraries A and B.
Have 4 drives go to media server A only, so that virtual library only belongs to that one media server.
Have 4 drives go to B only, so that virtual library only belongs to that one media server.

Now if I had more scratch tapes in LibA and none in LibB, I could just change the volume group to be LibB on those tapes.  As they are in the same physical robot.

Not to many people use this method as SSO allows you to have one big library and everybody take what ever drive is avail.

I don't have to know how to spell....I work on Unix.
NetBackup 7.0.1 - AIX & Windows