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Domino server data on logical drive being lost during failover

My question is about cluster failover when a logical drive is lost. We have two servers in a cluster, and the failover works correctly when a server is down, but we recently have had the following problem: The logical drive "D" (which contains the Domino Data) has been lost, and the Domino server keeps on running, but the failover doesn't happen when a user tries to access a database (by clicking an icon); he gets a "file does not exist" error.

Is this normal, or do we need to copy some files in the program drive ("C") to ensure the failover? Thanks a lot for your help.
It sounds like the default data directory for this Domino server is actually on another computer. If this is correct, I strongly suggest changing this. Domino data should be stored on a physically local drive that is inside the server machine. There are many reasons for this, one of which you described. Another big reason is to prevent another computer from accessing the files in the data directory, without going through the Domino server. This could corrupt the files.

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