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April 15th, 2010 02:00
Replication Window?
I am having some trouble optimising the replication window for our Avamar grids.
We have 2 grids in geographically seperate sites (same time zone) and both grids replicate to one another (root to replicate 'normal' replication?).
Our backup jobs start at 10pm, and the blackout window begins at 6am.
By default I think replication is configured to start 2 hours after backups start, giving us an 8 hour window before the blackout period. It is configured to run within a 20hour window. However, by doing this we dont replicate the larger backups (some of which take 6+ hours to complete. For these one of two things seem to happen:
1. The replication doesnt occur until the day after (not ideal). By this point the amount of data to ship may be sufficiently large to fail at 6am because of the blackout window.
2. The replication job fails at 6am.
I can set the replication job to execute at 10am, but then it runs throughout production hours (affecting the network).
Any suggestions? What are others doing?
Avamar Exorcist
462 Posts
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April 15th, 2010 13:00
It sounds like you may be short on network bandwidth
Take a look at the following solution:-
http://solutions.emc.com/emcsolutionview.asp?id=esg106464
You can use it to help calculate how much data can be replicated on a daily basis and compare it with how much data actually needs to transferred to achieve a full replication. If it takes longer than you have available for your backup window at least you'll be able to figure out how much extra bandwidth you need.
JohnCrouch_a316b2
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28 Posts
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April 19th, 2010 08:00
Yeah, despite what your EMC sales rep probably said, Avamar cannot defy the laws of physics! :-)
Are you getting the replication rate you would expect?
For comparison, Avamar reports our WAN as 5.66-6.695 Mbps. I get about 1.8 Mbps / 810 MB/hr replication rates each night in actual changed data sent.