96 unable to allocate new media for backup, storage unit has none available

[cargomez]

Initially we had two robots and four drives, robot 1 stopped working, therefore drives 1 and 2 are now offline. Now most of the backup jobs fail with the following error code:

10/21/2018

7:00:00 PM

pi-backup

pi-12

Error

144228

General

NBU status: 96, EMM status: No media is available

10/21/2018

7:00:00 PM

pi-backup

pi-12

Error

144228

Backup

backup of client pi-12 exited with status 96 (unable to allocate new media for backup, storage unit has none available)

10/21/2018

7:10:00 PM

pi-backup

pi-12

Error

144229

General

NBU status: 96, EMM status: No media is available

10/21/2018

7:10:00 PM

pi-backup

pi-12

Error

144229

Backup

backup of client pi-12 exited with status 96 (unable to allocate new media for backup, storage unit has none available)

What can of diagnostics or commands we can run to pinpoint what is the source of the problem?

[RiaanBadenhorst]

This error almost always boils down to one of the following

The pool you’ve select has no media available (with correct retention) to write on or continue writing on (and there are no free media in the scratch pool

There is media available but its density doesn’t match your storage unit’s density eg hcart ot hcart2

There is media available with correct density and in the correct pool but it’s frozen or suspended

Take a closer look at the media available on your pools, which pools the policies are using, storage units details and bpmedlalist to check for frozen media

[Marianne]

One more helpful report:
available_media
Run from cmd on the master server and redirect output to a .txt file.
Command is in goodies directory.