I've noticed sometimes that on new cluster setups the servers will lose the drive letter or even use a different one when you failover, especially with iSCSI connections. check disk manager and see if you can find it there as an unlabeled disk. Might have to re-assign the drive letter to it again on both nodes. 20GB for MSDTC seems like an awefully large volume.
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Mike Hahn - MCSomething someday:-)
Right way to ask for help!!
http://www.sqlservercentral.com/articles/Best+Practices/61537/
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