Compaq ProLiant 1850R Deploying the ProLiant Cluster for NetWare 4.2 - Page 12
Cluster Interconnects
View all Compaq ProLiant 1850R manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 12 highlights
'HSOR\LQJ WKH 3UR/LDQW &OXVWHU IRU 1HW:DUH Primary Array Controller Standby Array Controller Primary Storage Hub Standby Storage Hub Primary Host Controller Standby Host Controller Primary Path Backup Path Figure 4. Redundant Fibre Channel Loop As the figure shows, a redundant data path is configured between the cluster servers and the Compaq RAID Array 4000. The redundant components operate initially in standby mode. If any component (host controller, storage hub, array controller, or cable) in the primary path fails, the primary path becomes inactive, the standby path becomes active, and data transmission continues without interruption over the standby path. Cluster Interconnects The cluster interconnect is a data path over which nodes of a cluster communicate. This type of communication is termed intra-cluster communication. The ProLiant Cluster for NetWare 4.2 uses the standard public network controller card (NetWare Link), an optional Dedicated Link, and the Fibre Channel Disk Link to implement intra-cluster communication. At a minimum, the interconnect consists of two network adapters (one in each server) and a cable connecting the adapters to a public network hub to be utilized as the NetWare Link. The cluster nodes use the interconnect data path to: • Communicate cluster status • Send and receive heartbeat Since Novell High Availability Server does not mirror data between servers, the transfer of the heartbeat is very small (just the heartbeat or information about the health of the other server in the cluster is sent over the links). IMPORTANT: NHAS 1.0 requires IPX as the cluster communication protocol for the Direct Link connection. 0096-0699-A