Resource Pool "Observer" - how failover works in SCOM 2012

We currently have 5 Management Servers SCOM 2012 SP1 Cu6 + a SQL Failover Cluster for SQL database of SCOM/SCOMDW.
2 of these Management Servers are dedicated for network monitoring of approximately 200-400 network devices (including certified and generic devices). Additionally, we have about 20 distributed apps + 30-40 websphere JVM instances defined which are spread
accross all management servers.
my questions
1.) how can I determine, where a distributed app or network device or websphere instance is currently attached to? They belong to any member in the resource pool, but I haven't found any possbility to query scom (e.g. PowerShell) where a specific entity is
currently attached.
2.) for network monitoring, a seperate resource pool is defined (no scom agent is connected to these 2 servers). These two servers have local SSD disks, 2x quad core CPUs and 24GB memory each. When one of these management servers is rebooted, the mistery
starts. Many distributed apps throw a critical error (unavailable), in the eventlog many network devices throw also an error that they are offline, in SCOM they turn gray. The remaining management server is nearly exploding (high IOPS without much throughput)
for approx. 30 minutes, it seems that after return of the second management server they try to balance somehow the instances, but with many errors. (antivirus is turned off)
=> now, after several days, we've found somewhere in the internet the info that with 2 management servers in a resource pool, an observer should be defined. Should this resolve our issue or will e.g. the distributed apps always through an alert until their
state is recalculated? The documentation to the observer function is rare, and we are not able to find any further hint how to resolve our issue when doing reboots of management servers.
Thanks so far!
Best Regards Klaus

Dear Alexis,
Thanks for your answer. We've now changed the "All Management Server" Resource Pool to "Manual Membership" (through PowerShell), and clearly defined Observers for each resource Pool. Now, if any management server fails, the objects (distributed App, WebSphere
Instance, ...) turn into "not monitored" instead of "offline" which makes the difference now.
However, the network monitoring servers need about 30 to 60 minutes after reboot of one of them until they've reprocessed and recalculated everything. Within this time, the disk has 100% active time with approx. 1500 disk transfers/sec and about 1MB/s throughput.
(we've about 300 network devices - 150 are certified ones - attached to the management servers)
Best Regards Klaus

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