Exchange mailbox mounted incorrectly

Somewhere in the middle of the night our exchange servers are mounted incorrectly. As a result phones and owa fail to work. To fix we just reboot ctexch02

Screenshots. incorrect correct

What are some things I could look into
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Adam FarageEnterprise ArchCommented:
I would recommend looking at the Event Viewer: Application logs to see why the databases failed over, and the maybe post some of the errors here. It could be a number of things such as:

- Server (active) rebooting
- transient networking error between the active manager and the active mailbox role
- disk IO latency was too high

The Event Viewer: Application logs is a good place to start, and as you see things you do not understand post them here and we can help further.
stlhostAuthor Commented:
I see this

Cluster node 'CTEXCH01' was removed from the active failover cluster membership. The Cluster service on this node may have stopped. This could also be due to the node having lost communication with other active nodes in the failover cluster. Run the Validate a Configuration wizard to check your network configuration. If the condition persists, check for hardware or software errors related to the network adapters on this node. Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges.

Next Event
Active Manager failed to mount database publicfolderdb01 on server CTEXCH01.ctitle.local. Error: An Active Manager operation failed. Error: The database action failed. Error: An error occurred while trying to select a database copy for possible activation. Error: The database 'publicfolderdb01' was not mounted because errors occurred either while validating database copies for possible activation, or while attempting to activate another copy. Detailed error(s):

        Server 'CTEXCH01.ctitle.local' is not up according to the Windows Failover Cluster service.

So is this saying that ct1 was down?
Adam FarageEnterprise ArchCommented:
It sounds like a networking issue, which is my second point above. I would look into your networking stack and also the server itself, make sure all updates are installed and see if you have any errors on the switches during this timeframe (e.g: CRC incoming / outgoing errors).
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stlhostAuthor Commented:
They are both virtualized and both on the same box actually. A total of 9 Vms are running on that server. If any of them were unable to ping our monitoring system would pick it up and send us an alert.  Any other ideas?
Adam FarageEnterprise ArchCommented:
its not a question of them being "offline" but either they cannot communicate to each other due to a transient error on the network, or the disk IO was so high (or other system resources) that the "keep-alive" RPC request from the active manager was not responded to in enough time from the active database.

Look at the stats for the server from that time.. but I am not saying it was down, but the errors do say about that for whatever reason the keep alive RPC packet was not responded too, or not in enough time.

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stlhostAuthor Commented:
Ohhh I got it. Thanks I'll start looking there.
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