APC AP9606 Specifications download pdf (Page 65)

Chapter 3. UPS configurations for cluster 57

The three failure scenarios in 3.3, “Solutions with double power lines” on page 51

are handled as follows:

1. One power line works properly and the other fails

All resources are moved to the surviving node. If the remote node has been

set manually to Node Paused by the administrator, the script will run the

branch “both power lines are failing”.

2. Both power lines fail at the same time

Each node brings the resources offline (exceptions: quorum disk and Cluster

Group).

3. At first one power line fails, later the second power line fails before all

resource moves are completed

One node begins actions as in scenario 1. Then the second power failure

occurs. Groups that are still on the node with the first failure also go offline.

Groups already moved to the node with the second failure will first go online

and then be taken offline.

3.3.4 Example configuration with two UPS units

We used an MSCS solution with two IBM Netfinity 8500 servers (8681), an IBM

Fibre Channel RAID Controller (3526) with six IBM EXP15 (3520) enclosures and

two IBM Fibre Channel hubs (3523). We installed this cluster with two redundant

Fibre Channel loops.

Figure 55. Double UPS

All power supplies of one Netfinity are connected to one APC SMART-UPS 5000.

The power supplies of the RAID controller and the enclosures are connected to

IBM Netfinity EXP Storage

Expansion Unit

IBM Netfinity EXP Storage

Expansion Unit

IBM Netfinity EXP Storage

Expansion Unit

IBM Netfinity EXP Storage

Expansion Unit

IBM Netfinity EXP Storage

Expansion Unit

COM

Network

QLogic A.

IBM Netfinity

8500R

COM

Network

QLogic A.

FC-AL HUB FC-AL HUB

IBM Netfinity Fibre Channel

RAID Controller

IBM Netfinity EXP Storage

Expansion Unit

IBM Netfinity

8500R

Power 1 Power 2

APC Smart UPS

5000

APC Smart UPS

5000

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APC AP9606 Specifications Page 65

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