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What can be causing a lot of network traffic between 2 media servers over port 1556?

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我需要解决方案

Hello.

I was recently informed that network traffic between 2 media servers was taking up a lot of bandwidth between 2 Data Centers. Here is the setup:

2 sites: Prod and DR. Master and a media server in Prod; media server writes to a Data Domain (via boost/OST). In DR, I have a media server, also backing up to a local DD, as well as a tape library. All servers are RH linux, running NBU 7.5.0.6.

Pretty standard config, using SLPs to duplicate as follows (the "-->" indicates and indent):

PROD-SLP

Backup to PROD-DD

--> Duplication to DR-DD

--> --> Duplication to Tape

DR-SLP

Backup to DR-DD

--> Duplication to PROD-DD

--> Duplication to Tape

So I should be writing to tape from the DR backup on the DD. I also have "Use only the following media servers" checked off in the Storage Unit setup for the DD disk pool.

The traffic can't be the DD-to-DD duplication, as those go over a different port. What I've noticed in the duplication to tape jobs, is that NBU will assign either media server to the DR-DD to read from. So in essence, the cause of all this network traffic could be the PROD media server reading and hydrating the data from the DR DD, then sending it to the DR media server for tape out. Any way to restrict this to only read from DR DD from the DR media server?


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