Your network contains two servers named Server1 and Server2 that run Windows Server 2008 R2.
Server1 and Server2 are configured as a failover cluster named Cluster1.
Cluster1 hosts a clustered application named App1.
App1 has a physical disk resource named Cluster Disk 1.
You need to use the Chkdsk tool to fix all of the errors on Cluster Disk 1.
What should you do first?