Online catalog backup issue

[hongmo_kim]

Hi, everyone.

NetBackup version is 6.5.4
I have a online catalog backup policy, and it uses tape media.
After the job completed, 2 tapes are created in once.
I wonder why online catalog backup uses two tapes.
This symptom also occurred in NBU 6.0 version.

And when executing the catalog vault job,  2 tapes are created everytime.
So I have been ejected 2 tapes from Tape library for vault.
Catalog backup sub jobs use it's own media in simultaneous.
I don't think this is not normal case.

Do you know what is the reason of this?
What should I modify or reconfigure?

Please comment.
Thanks

[Andy_Welburn]

when I had a similar issue:

Create a new Storage Unit for your Catalog Backups & set the maximum concurrent write drives to one

***EDIT***
There are two elements of the Catalog Backup that write to tape - if there are enough tape drives available & the storage unit allows it then it will do both at the same time - hence the two tapes you are seeing.

Additional info:

DOCUMENTATION: In NetBackup 6.5, a hot online catalog backup normally consists of one parent job and...

[hongmo_kim]

Thanks for your comment.
I'll reference your opinion.

[Andy_Welburn]

or if you need further assistance.

[hongmo_kim]

Andy...
But it's not possible to reduce the max drive number for online catalog backup.
Tape libary has 10 drives, and max drive num is set to 10 naturally.
We had four backup domains(master server).
All Master server has 10 drives.
But some master server assign a tape for online catalog backup.
Is there any good method to limit tape number?

[J_H_Is_gone]

the thing you have to get into your head is that you can have storage units that total more then the number of your drives.

The red ones are my master/media  - the first storage unit has 6 drives  I use this storage unit on most of my policies
the second storage unit is also my master - but for this storage unit I said only 1 drive
I use this storage unit on my Hot Catalog policy.

If I have 10 drives I could have
su1 = 10 drives
su2 = 9 drives
su3 = 8 drives
su4 = 7 drives
su5 = 6 drives
su6 = 5 drive


that's 45 drives in all but no one storage unit has more the my total number of drives
 

so it is just a mater of making a new storage unit with 1 drive in it and have the catalog use that storage unit.


 

[hongmo_kim]

J.Hinchcliffe

I understand your description.
All drives are shared drive, so it is shared by other SAN media server.
But these SAN media servers only can back up local data, it's not possible to back up the other clients.
Therefore, we use master server to back up the network client's data.
So we have to set the max drive num to maximum.
 

[J_H_Is_gone]

you are talking about backing up the Hot Catalog on the master using the master as your media server.

you do not have to change anything on what your currently have for backing up the clients.

you have a policy called Hot_Catalog_Backup

in this policy you have it set up to use a storage unit - the one you currently use is set to 10 concurrent drives.


CREATE a NEW storage unit - set that storage unit to 1 concurrent drive.
change ONLY the Hot_Catalog_Backup policy to use this new storage unit that has 1 drive.

the backups of your other polices continue to work as they always have  using the storage unit of 10 drives.

 

[Andy_Welburn]

;)