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Poor performance during duplicate job

Created: 16 Apr 2013 | 5 comments

Hi,

i'm running Backup Exec 2010 R2 on a Dell R510 with 12x 2TB as a RAID5 and a TL4000. The idea was to do backups to disk and then copy them over to LTO5 tapes. my problem is that the copy performance is really poor and far away from what is possible.

Backup of Exchange 2010 with three databases runs with a rate of 2.2GB/min and takes about 9 hours for 1.2TB.

Duplicate of this set runs with a rate from 1.1GB/min to 1.5GB/min and takes 16 hours, sometimes even 20 hours. sure it's more the obvious that it's hard to get a exchange backup and two copies to tape for on site and off site storage.

I'm pretty sure that the hardware is not the problem. i did some tests backing up data to tape from the disk where the backup2disk folders are located. it turned out that the server is able to write to tape a little bit more than 10GB/min.

how comes that a duplicate job with the same source and destination has such a big difference in job rate?

regards

Operating Systems:

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CraigV's picture

Hi,

 

This is a straight B2D and not dedupe right? If not, and it's dedupe, then your data is rehydrating to the original size during the duplicate-to-tape which explains the slow speed.

Thanks!

Alternative ways to access Backup Exec Technical Support:

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PacketByter's picture

no, deduplication is not in place at all.

regards.

pkh's picture

You might want to tune your tape drive.  See my article below

https://www-secure.symantec.com/connect/articles/t...

Athough it is written for LTO4, the principle is the same for LTO5

You might also want to defrag the volume where your B2D folder resides.

PacketByter's picture

Hi,

thanks for the link to the article but the tape drives do not need further tuning. running backups from the disk, where the backup2disk folders are located, with more the 10 GB/min proofs that the hardware is running just fine. the partition on the disk was just created so fragmentation could not be the problem.

during duplicate i monitored with resource monitor and i did see that beremote.exe read with pretty high rate the .edb files for about 10 minutes. then it stopped and started writing with a very low rate (800kB/s) to \Catalog\hostname\catstore\*.fh_*. this took about 10-30 minutes and during this time i did't see any data going to the tape drive.

regards

CraigV's picture

FWIW, have you considered upgrading to BE 2010 R3 for free (you can use your current licenses)...it may fix your issue (may not too) as it had a number of improvements over the previous 2 versions. You can get the ISO on the link below. Install, update with SP2 and any additional patches, and push-install these out to your remote servers:

http://trialware.norton.com/files/fc/Backup_Exec_2010_13.0.5204_MultiPlatforms_Multilingual_DVD.iso

Thanks!

Alternative ways to access Backup Exec Technical Support:

https://www-secure.symantec.com/connect/blogs/alte...