timed out waiting for media manager to mount volume(52)

let us know how many media server with thr OS

Are you faceing this issue for all STU (media server) or only for 1 master/media ?

Are you facing this issue for all tape drives or just for 3-4 drives ?

is thr any activity happend on master server in last 3-4 days ??  

Ensure you have bptm log on all media servers as well as VERBOSE entry in vm.conf on all of them (restart NBU to take effect).

You will need these logs to troubleshoot - bptm as well as system logs (syslog on Unix servers and Event Viewer System and Application log on Windows media servers.

As Nicolai explained - incorrect device mapping can cause this: Robot mounts tape in drive 1. If this drive device path is wrong in NBU config, the mount confirmation will not be received via OS device path. Ensure persistent binding is in place - especially on the Windows media servers.

Verify that the drive mapping is valid. If Netbackup think a drive is located in the first slot of the library but in reality located in the second you may receive the error you are facing.

Upon mount a tape is loaded to the wrong drive (e.g. slot 2) and Netbackup wait for the tape drive to become ready, but because tape has been loaded in slot 1 this will never happen.

The best way to test is by using Netbackup tpreq command and test each location. For Unix you can use the "mt -f /dev/rmt/??? status" command to test if a tape is mounted and ready.

I've setup the bptm logs on the media servers and checked the HBA config. I've attached the a screen shot of the HBA config also

"Automapping: Enabled "

Change to persistent binding. Automapping will cause device paths to change when servers are rebooted.

PLEASE also remember to add the VERBOSE entries to all vm.conf files on all servers. This will log device/media manager errors.

Hi 

You recently did any patch update or any changes in master as well media server side if so check the compatibility list on both sides IBM and symantec, if not Pls check with density type of drive .

Are you faceing this issue for all STU or only for 1 master/media.

How long you are getting this issues? or is running environment throwing this issue?

I've finally managed to get the bptm logs from the media server that seems to be having problems. I keep seeing the following in the log:

process_tapealert: TapeAlert returned 0x00000000 0x00000000 (from io_terminate_tape)
04:27:27.147 [27918426] <2> io_terminate_tape: writing empty backup header, drive index 8, copy 2
04:27:27.147 [27918426] <2> io_terminate_tape: reposition to previous tapemark and rewrite header
04:27:27.147 [27918426] <2> io_ioctl: command (12)MTBSF 1 from (bptm.c.8661) on drive index 8

Is it anything to worry about?

All the messages are information only <2> you need to look for messages with <8> <16> or <32>.

Also please check your media physically,drag the tab ,it should not be write protected,otherwise it will give such errors.

Make sure you are using persistent binding everywhere and also that your windows Media Servers are not doing constant tape checks which can reset the tape drives.

This is done by adding or editing a registry key - a DWORD named AutoRun with a decimal value of 0 into the tape drivers key.

See this tech note (says Windows 2003 but applys to 2008 as well i believe)

http://support.microsoft.com/kb/842411

It needs a reboot once done and the re-check it as some drives will re-apply a setting of 1 after a reboot and you may need to re-install the drive from a command line to stop this happening