Acer Altos RAIDWatch, Manual

Page: 48 / 212

Altos RAIDWatch User Guide
34
3.3.1.1 Redundant Modules
It is recommended to install Primary and NPC Agents redundantly on different servers to avoid the
blind time when the Primary Agent or NPC module is down. Once the Primary Agent or NPC is
down, the Primary Agent installed on another server will take over instantly allowing NPC to work.
Primary Agent and NPC should be installed manually on different servers. The configuration utility
does not automatically add these modules to the selected RAID server.
If Enable Redundant is selected, the following options shown in Figure 3–3 will appear.
• Mode: assign the preferred mode for the Primary Agent installed on current server as active or
standby. There exists an active-standby relationship between Primary Agents and the
relationship can be automatically resolved between agents.
• Peer Host: enter the IP address.
• Peer's Port Number: A use should enter the same port number as that on the current Primary
Agent host.
• Negotiation Interval: This is the duration of time (in seconds) for Primary Agents to negotiate
for the active-standby status. A Primary Agent might wait for seconds for its peer agent to start
up.
Important At least one Primary Agent and one Secondary Agent must be installed in a network managed by
Altos RAIDWatch. RAID controllers are managed by Secondary Agents which are in-turn managed
by the Primary Agent. Without Secondary Agents associated with each RAID, it will be impossible
to manage RAID systems.
The
Event Monitor
also requires Primary and Secondary Agents to be running on RAID servers to
record system events and report system status.
Even if the system only has one RAID and all Altos RAIDWatch components are installed on a single
server, both a Primary Agent and a Secondary Agent must be installed.
Figure 3–3 Enable Redundant Options