Content Comparison

In case of MCCS needed data cannot be shared among nodes in a cluster, namely NAS or DAS, may not use latest data after failover. In this case, Mirror disk is used when there is no external shared disk, and is replicated between two nodes by using replication component. MCCS provides replication function of DataKeeper from SIOS corporation (OEM Product) and Mirror Disk Agent manages this replicated data set. 

It functions properly according to the state and role of mirror disk. Actions such as state and role of mirror disk are all recorded in the system event log, and this information will be sent to MCCS through event log monitor module.
MCCS Event Module is activated when MCCS service starts.
Data replication software operates by creating mirror set for volumes between two nodes.
The primary server has source volume and the secondary server has target volume which is an exact replica of source volume.
Client is only available to read/write in the source volume, changed block of the volume is replicated to the target volume through the TCP/IP network connection. At this point, target volume is in lock state and read/write is not allowed. This is to ensure data integrity by preventing the use of target volume.