HP Serviceguard manual Power Supply Planning, Hardware Configuration Worksheet

Hardware Configuration Worksheet

You may find a worksheet such as the following useful for organizing and recording your cluster hardware configuration. This worksheet is an example; blank worksheets are in Appendix E. Make as many copies as you need.

SPU Information:

Host Name ____ftsys9___________ Series No ______rp8400____________

Memory Capacity ____128 MB _________ Number of I/O Slots ______12_______

=============================================================================

LAN Information:

Name of	Name of	Node IP	Traffic
Subnet __Blue___	Interface ___lan0___ Addr___35.12.16.10__		Type	____HB___
Name of	Name of	Node IP	Traffic
Subnet __Blue___	Interface ___lan2___ Addr_______________		Type	_standby_
Name of	Name of	Node IP	Traffic
Subnet __Red____	Interface ___lan1___ Addr___35.12.15.12_		Type _HB, client

=============================================================================

Disk I/O Information for Shared Disks:

Bus Type _SCSI_ Slot Number _4__	Address _16_ Disk Device File __________
Bus Type _SCSI_ Slot Number _6_	Address _24_ Disk Device File __________
Bus Type ______ Slot Number ___	Address ____ Disk Device File _________

Attach a printout of the output from the ioscan -fnC disk command after installing disk hardware and rebooting the system. Mark this

printout to indicate which physical volume group each disk belongs to.

Power Supply Planning

There are two sources of power for your cluster which you will have to consider in your design: line power and uninterruptible power sources (UPS). Loss of a power circuit should not bring down the cluster.

Frequently, servers, mass storage devices, and other hardware have two or three separate power supplies, so they can survive the loss of power to one or more power supplies or power circuits.

If a device has redundant power supplies, connect each power supply to a separate power circuit. This way the failure of a single power circuit will not cause the complete failure of any critical device in the cluster. For example, if each device in a cluster has three power supplies, you will need a minimum of three separate power circuits to eliminate electrical power as a single point of failure for the cluster.

In the case of hardware with only one power supply, no more than half the nodes should share a single power circuit. If a power source supplies exactly half the nodes, it must not also supply the cluster disk lock or Quorum Server, or the cluster will not be able to re-form after a failure. See the section on cluster locks in “Cluster Configuration Planning” for more information.

To provide a high degree of availability in the event of power failure, use a separate UPS at least for each node’s SPU and for the cluster lock disk (if any). If you use a Quorum Server, or quorum server cluster, make sure each quorum server node has a power source separate from that of every cluster it serves. If you use software mirroring, make sure power supplies are not shared among different physical volume groups (or VxVM disk groups); this allows you to set up mirroring between physical disks that are not only on different I/O buses, but also connected to different power supplies.

To prevent confusion, label each hardware unit and power supply unit clearly with a different unit number. You can use a Power Supply Worksheet such as the one that follows to record the hardware

Power Supply Planning 97