I am doing NDMP backups using Symantec Backup Exec to a HP MSL4048 Tape Library connected to my NetApp Filers directly via FC.
Most evenings the backup jobs fail with an error of 0xe0008f4 - An unknown error has occurred. If I rerun the job it sometime works. I have always managed to get the job to work but it can take up to about half a dozen tries to get it to work.
I can see that a tape is loaded into the drive but then the job fails. Sometimes it will leave the tape in the drive and sets the drive to prevent removal of the tape from the drive. Once this has happened to all of the drives connected to the filer the only way I have found to unload the tapes from the drives is to reboot the tape library which resets the prevent tape removal flag from the drive so that I can either manually move the tape out using the Remote Management Interface of the tape library or let Backup Exec unload the tape when it tries to load a different one.
Anyone have any suggestions as to why these jobs are failing or some hints on where I can look to investigate the issue, e.g. are there some ndmp logs somewhere on the filer? I am not sure if this is an issue with Backup Exec, ndmp (or something else on the filer) or a problem with the tape library.
The tape library has 4 drives. As each of the NetApp controllers are directly connected to two of the drives each (no SAN switch involved) I have configured the library as two logical libraries so that each controller has access to a robotic path. For the first logical library containing drives 1 and 2 connected to one of the NetApp controllers drive 1 is configured to host the robotic path as a LUN. For the second logical library containing drives 3 and 4 connected to the other NetApp controller drive 4 is configured to host the robotic path as a LUN.
Re: NDMP Backups with Symantec Backup Exec and HP MSL4048 Tape Library
I am running Symantec Backup Exec 2010 R3 and Data ONTAP 8.0.2 7-mode. The NDMP Certification page lists Symantec Backup Exec 2010 R2 but not R3. Also for Symantec Backup Exec 2010 R2 it lists Data ONTAP 8.0 7-mode, for some other products it list 8.0.x 7-mode so it would suggest that 8.0.2 7-mode is not certified.
The tape library has FC HP LTO-5 drives in it which has been supported since Data ONTAP 7.3.2P5D4.
My Backup Exec system is running much better now. I deleted all of the tape drives and libraries out of Backup Exec and get it to rediscover them. That has helped. There is a technote about it somewhere