APC RAID Subsystem SCSI-SATA II User Manual download pdf (Page 244)

SAS / SATA II NAS System

244

User’s Manual

11.2.1 Hardware Aspect

Active server: proNAS HA server that performs cluster-protected operations.

Backup (Standby) server: proNAS HA server that can takeover the critical operations

of an active server when the active server is down or unavailable.

Private net: Private net is a dedicated channel for servers to exchange their operating

status (i.e., heartbeat message).

Types of Private Net Available:

¾ TCP/IP socket: Ethernet network running TCP/IP protocol. Each server must

install a dedicated IP to attach to the private net.

¾ RS-232 serial port: One free serial port per server. A null modem cable must be

installed to connect the serial ports of the two servers.

Public net: Public net is the paths for networked clients to access cluster- protected

resources.

Network Configuration for High Availability Pair

The following diagram illustrates the network configuration for a High Availability pair:

Multi Port Switch

Public Net Private Net Private Net Public Net

RS232 Serial Port

Active Server proNAS HA Resource Backup Server

Virtual IP

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APC RAID Subsystem SCSI-SATA II User Manual Page 244