Netback up offhost backup

[Mehul_Pal]

Hi,

I was reading NBU snapshot guide 7.7

i read about offhost backup

one thing was unable to understand the primary & mirror disk 

coz NBU will take the snapshot from the mirrored disk after the split

how split will happen?

can anybody please describe

how the below operation can happen nbu does that or else?

Primary client collaborates with the alternate client
to create the snapshot. Primary client splits the
mirror disk from primary disk, and mounts the
snapshot on the alternate client.

[Marianne]

You need to read a bit more in the manual... you will see that you need to choose the snapshot method.

NetBackup supports a number of third-party snapshot technologies. Such as array snapshots.

NetBackup does not take the snapshot. It works with the snapshot technology to take the snapshot and split the mirror and present the copy to the media server.

So, if you are interested in snapshot and offhost backups, you first of all need to check the snapshot client compatibility list and verify that you have Enterprise Client license.

[Mehul_Pal]

Thank you very much for the answers

I have just one more question

Unable to understand the below lines

The copy-on-write is not created as a complete copy of the client data on a separate
or a mirror disk. The snapshot is then backed up to storage as specified in the
backup policy. Users can access their data without interruption, as though no backup
is underway. The file system is paused long enough to assemble a transactionally
consistent record.

[Marianne]

Have you tried to read through these topics as well?

See “How copy-on-write works” on page 290.

See “Benefits of copy-on-write versus mirror” on page 23.

I am sure if you read through these sections you will understand the various snapshot methods.