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Slow tape to tape duplicates

Created: 24 Feb 2014 | 7 comments

Hi,

Backup Exec 2010 R3 SP3 on a Windows 2008 Standard R2 64bit server.

IBM TS3200 Tape Library with LTO5 tape drives.

We run weekly backups to tape, and than duplicate those tapes to send to a remote site.

I'm used to get a very good jobrate on the tape-to-tape duplicates - 5,000MB/min - 7,500MB/min.

All of a sudden I'm starting to get slow job rates of 3,000MB/min - 5,000MB/min.

No known changes I recall during the last week or two.

What could be the reason?

 

Operating Systems:

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CraigV's picture

...might happen if the tape drive is starting to get dirty or you installed a patch. Have you tried to restart the library and the media server?

THanks!

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YonatanC's picture

Well, one the drives was actually replaced about a month ago, and we upgraded the library and tape drive firmware to the latest. But since then I ran other duplicate jobs that were faster.

I have 4 tape drive so I'm running two concurrent dupliacte jobs and I get the slow job rate on both of them.

 

CraigV's picture

...and you're using the Symantec drivers for the tape drives and the robotics shows as "Unknown medium changer" in Device Manager?

Have you tried to recreate the duplicate job to rule out corruption in that job?

Thanks!

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YonatanC's picture

...and you're using the Symantec drivers for the tape drives and the robotics shows as "Unknown medium changer" in Device Manager?

How did you know? :)

and yes, I already created several duplicate jobs even using different source and target tapes.

 

CraigV's picture

...matter of interest, but have you tried to switch the tapes around? ie. if you're backing up to Tape Drive 1 and duplicating to Tape Drive 2, swop it so that Tape Drive 2 does the backup and Tape Drive 1 does the duplicate?

Thanks!

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YonatanC's picture

Yes, I've tried that.

BUT, I now recall that about a month before the issue started we upgraded the firmware of the tape library and tape drives to the latest. Can that cause any issues with slow duplicates?

I'm wondering, what is the process of the duplication? Is the data being transfered directly from drive A to drive B or is it being copied to the media server first?

Also, what tape drivers are more recommended to use - the Symantec, IBM or Microsoft drivers?

CraigV's picture

...there should be some sort of metadata passing through the media server as it would need to update the BEDB and build a catalog of the data's new location, but I would think that the data would flow internally in the library itself between the drives.

You should be using the Symantec drivers (generic as they are) as they'd be written specifically for BE. The robotics would be listed as Unknown Medium Changer in Device Manager.

Thanks!

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