Compaq ProLiant 1000 User Guide: Online Storage Controller Recovery Option - Page 20

Merging two SMART-2 Controllers, into a Controlled Pair

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2-2 Functionality and Configuration Options Merging two SMART-2 Controllers into a Controlled Pair OSCRO allows you to merge two matched SMART-2 controllers into a controller pair. In such a pair, one controller is active and the other remains in standby mode. Should a problem occur with the active controller, the SMART-2 device driver switches traffic to the standby controller without loss of data or interruption of service (see Figure 2-1). 1 0 1 0 Active Standby 1 0 1 Failed Active Device Driver A controller pair is established. Device Driver If the active controller fails, the standby controller is promoted to active. Figure 2-1. Online Storage Controller Recovery Option Overview

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2-2
Functionality and Configuration Options
Merging two SMART-2 Controllers
into a Controlled Pair
OSCRO allows you to merge two matched SMART-2 controllers into a
controller pair. In such a pair, one controller is active and the other remains
in standby mode. Should a problem occur with the active controller, the
SMART-2 device driver switches traffic to the standby controller without
loss of data or interruption of service (see Figure 2-1).
Figure 2-1.
Online Storage Controller Recovery Option Overview
Device
Drive
r
Device
Drive
r
Active
Active
Standby
Failed
1
0
1
0
1
0
1
A controller pair
is established.
If the active controller fails, the standby
controller is promoted to active.