On earlier versions of SCOM, I've used the excellent 'Extended Agent Info Management Pack' from Jose Fehse and over the last year or so, I've been using Kevin Holman's 'SCOM Agent Management Pack' to meet the same requirement. Although both of these community MP's enable me to add or remove Management Group name references on agents (which essentially multi-homes the agent), it's still a manual task that needs to be kicked off from the console.
With Kevin's newest 'SCOM Multi-Home Management Pack', this process is made a lot easier through the use of a rule that runs periodically and which is targeted at eight pre-created SQL Query-based groups within the MP.
This means that in large environments (think 1000's of agents), the management pack will query the SCOM database and then automatically distribute the number of agents you have across each of the pre-defined groups shown below.
The automatic assignment of agents to the different groups is configured by default to distribute in batches of 500 agents per group however, you can modify this number by editing the group discovery prior to importing the MP into SCOM.
Once the groups have been populated, the MP will then perform a check once a day to validate if the agents have been multi-homed and if any haven't, then it will update those agents using a random time window - thus ensuring your OpsDB doesn't get hammered with the dreaded Event ID 2115 data insertion errors.
To conclude, if you're planning any side-by-side migrations that contain large numbers of agents in the near future, then you'll definitely want to try out this MP to make your job easier and to ensure your OpsDB stays healthy.
You can get the full lowdown on the MP from Kevin Holman's blog here and you can download it directly from the TechNet Gallery here.
Enjoy!
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