Netbackup 7 Duplication Question

[suryadevarauday]

Hi Experts,

I have a Netbackup 7 version running on Linux, and had two tape drives. I have problem with Duplication job i can see only one duplication job running and the staging gets full soon.

I check the tape drives using ./vmoprcmd -d and i can see the drives as active or Control is TLD. and they have Active does this mean they both are up? and having no issues? 

                              PENDING REQUESTS

                                     <NONE>

                                  DRIVE STATUS

Drv Type   Control  User      Label  RecMID  ExtMID  Ready   Wr.Enbl.  ReqId

  0 hcart3   TLD               Yes   0003L4  0003L4   Yes     Yes        0

  1 hcart3   TLD                -                     No       -         0

---------

And these are both ACTIVE.

                              PENDING REQUESTS

                                    <NONE>

                                  DRIVE STATUS

Drive Name               Label   Ready  RecMID  ExtMID  Wr.Enbl.  Type

    Host                       DrivePath                            Status

=============================================================================

IBM.ULT3580-HH4.000      No      No                     No        hcart3

    ibackup              /dev/nst1                            ACTIVE

IBM.ULT3580-HH4.001      Yes     Yes    0144L4  0144L4  Yes       hcart3

    ibackup              /dev/nst0                            ACTIVE

Thanks,

surya

[Marianne]

Please post Storage Unit config:

bpstulist -L

[suryadevarauday]

Here is the output, I believe they both are Up and running. For some reason its only writing to one tape. Do you think this is because of the large NDMP backups its more then 1TB.

[root@ibackup admincmd]# ./bpstulist -L

Label:                ibackup.hcart3-robot-tld-0

Storage Unit Type:    Media Manager

Host Connection:      ibackup

Number of Drives:     2

On Demand Only:       no

Density:              hcart3 (20)

Robot Type/Number:    TLD (8) / 0

Max Fragment Size:    1048575

Max MPX/drive:        10

Label:                staging

Storage Unit Type:    Disk

Media Subtype:        Basic (1)

Host Connection:      ibackup

Concurrent Jobs:      10

On Demand Only:       yes

Path:                 "/staging"

Robot Type:           (not robotic)

Max Fragment Size:    524287

Max MPX:              1

Stage data:           yes

Block Sharing:        no

File System Export:   no

High Water Mark:      40

Low Water Mark:       30

Ok On Root:           yes

[root@ibackup admincmd]#

[Marianne · Accepted solution]

Please have a look at this TN and compare with behaviour seen in your environment:

http://www.symantec.com/docs/TECH44719

DOCUMENTATION: Description of Symantec NetBackup Disk Staging Relocation Behavior

[suryadevarauday]

Thanks Marlanne, nice info but had few more question on these.

The suggestions in the doc says to split the jobs into multiple small files to not exceed 25 GIG. But if you are taking backups using the NDMP can u do the same because i am using set SNAPSURE =y because i have more then 500GIG to 1TB drives in some NDMP backups.

[Marianne]

The TN describes the way that NBU automatically groups images for disk staging.

The way I understand this is that NBU will group the images if it is smaller than 25 GB. So, a single backup job larger than 25 GB will be treated as a single job during duplication running to one tape drive.