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Nework Backup Bogs entire network down

Posted on 2013-12-06
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Last Modified: 2015-02-23
We have a weird problem that occurs only when the "Symantec Backup Exec 2012 SP3" network-based backups are running.  At which time, every night, I experience a notable lag in overall network performance.  Furthermore, some IP phones loose their connection as well as several network shares that some proprietary software/servers access.  I get email alerts when they loose their connection, and it all occurs when the Backups are running .  

We have a gigabit network using Cisco Small Business Switches (SG 300) with a Watchguard XTM 510.  It supports Inter-VLAN routing via the "trusted" VLAN feature.  We have about 9 VLANs.  Spanning Tree protocol is in place, and I don't see any ports going into "blocking state" in the Cisco logs.

The backup media server is on our management VLAN.  Most of the servers that are backed up nightly (differential nightly, weekly full) are on the management network.  A few systems that are backed up nightly are on other VLANS.  The lag seems to effect

Does anyone have a direction for me to start looking into this?  I have considered segmenting the network more intricately, but since most servers are already on the management network, this is unlikely to help.  Perhaps QoS would help, for example lowering the QoS value for the backup traffic below everything else.

The backup logs on the Backup Exec Server show outstanding performance for our backup history.  Our backup speed ranges from 700 - 2,000 MB/min.  The total size of most backups are between 20-30GB each for the differential nightly's. For example, it's common for a 36GB backup to be completed in about 26 minutes. So performance seems great, but maybe that's part of the problem.

Any help or leads would be much appreciated!  Thanks Experts!
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Question by:Nick Daniels
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Expert Comment

by:DonConsolio
ID: 39702060
Have you tried to limit bandwidth in "Bandwidth properties" ?

http://www.symantec.com/business/support/index?page=content&id=HOWTO13915
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Nick Daniels earned 0 total points
ID: 39717085
That link points to different Software "NetBackup", not BackupExec.  I called Symantec Tech Support to verify and they confirmed there is no way to throttle or limit bandwidth.

Thanks for the suggestion though!
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Author Closing Comment

by:Nick Daniels
ID: 40625349
This was a network device that had an improperly setup port.  Too Specific of a scenario for anyone to guess...
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