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Slow backup with new tape drive

mwitdept
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Last Modified: 2013-12-01
We have just replaced our old tape drive with a new HP DLT VS160 tape. However we are getting very slow data rates. About 60MB per minute instead of 484MB per minute.
The server is a HP Proliant Server - ML350 G3 which has a HP/Compaq 64-Bit/66MHz Dual Channel Wide Ultra3 SCSI Adapter while the interface on the tape drive is Wide Ultra III SCSI-2 (LVD). We use Backup Exec 10.

Is there a way that we can speed up the backup to what it was before? Could it be the difference in interfaces that is causing the bottleneck?
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Commented:
Is the adaptor just running the tape drive or is it running a disk pack also.

If so you may need a seperate scsi controller to get a decent speed out of it....

Commented:
It could be interfaces but it could also be termination issues. Verify you only have ONE terminator on this channel and that it's enabled/installed on the last EXTERNAL device on the SCSI bus.

Author

Commented:
Wall ID: I think the adapter is just running the tape drive as there is seperate RAID controller
AJermo: I will check the termination but it was a straight swap, went on to the same connector on the cable.

Author

Commented:
Turned off hardware compression last night and it ran at 350MB/s last night.
Commented:
Ignore the last comment.

Have now upgraded to backup exec 11d and now cannot access the user defined share, get the following error: Access to this device is not authorised with this version of backupexec.

The share is on a Liuux server (RedHat) but it worked fine before. Don't have any Linux remote agents

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Commented:
Have sorted out the access problem. The server is now showing that it is using a Symantec tape drive rather than an unknown one prior to the installation

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Commented:
Seems it was to do with the tape driver and the version of BackupExec. It ran last night at 405MB/s

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Commented:
All sorted now. It runs quicker than ever

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