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. No more than half of the nodes should be on a single power source. If a power source supplies exactly half of the nodes, it must not also supply the cluster lock disk or the cluster will not be able to reform after a failure. See the section "“Cluster Configuration Planning ”" for more information on cluster locks.

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, and ensure that disks which will be configured as members of separate physical volume groups are connected to different power supplies. This last rule enables disk mirroring to take place between physical disks that are connected to different power supplies as well as being on different I/O busses.

To prevent confusion, it is suggested that you label each hardware unit and power supply unit clearly with a different unit number. Indicate on the Power Supply Worksheet the specific hardware units you are using and the power supply to which they will be connected. Enter the following label information on the worksheet:

S800 Host Name: Enter the host name for each SPU.
Disk Unit: Enter the disk drive unit number for each disk.
Tape Unit: Enter the tape unit number for each backup device.
Other Unit: Enter the number of any other unit.
Power Supply: Enter the power supply unit number of the UPS to which the host or other device is connected.

Be sure to follow UPS and cabinet power limits as well as SPU power limits.




	NOTE: Battery backup functionality on the Series 890 system is not supported by MC/LockManager.

Power Supply Configuration Worksheet

The power supply configuration worksheet will help you organize and record your specific power supply configuration. Figure 4-2 “Sample Power Supply Configuration Worksheet” is a sample worksheet filled out. Refer to the appendix, "Appendix E “Blank Planning Worksheets ”" for samples of blank worksheets. Make as many copies as you need. Fill out the worksheet and keep it for future reference.

Figure 4-2 Sample Power Supply Configuration Worksheet

===============================================================================
    SPU Power:
 
    S800 Host Name ____ftsys9__________    Power Supply _____1_______________
 
    S800 Host Name ____ftsys10_________    Power Supply _____2_______________
 
===============================================================================
    Disk Power:
 
    Disk Unit __________1_______________    Power Supply ____3__________________
 
    Disk Unit __________2_______________    Power Supply ____4__________________
 
    Disk Unit __________________________    Power Supply _______________________
 
    Disk Unit __________________________    Power Supply _______________________
 
    Disk Unit __________________________    Power Supply _______________________
 
    Disk Unit __________________________    Power Supply _______________________
 
===============================================================================
    Tape Backup Power:
 
    Tape Unit __________________________    Power Supply _______________________
 
    Tape Unit __________________________    Power Supply _______________________
 
===============================================================================
    Other Power:
 
    Unit Name __________________________    Power Supply _______________________
 
    Unit Name __________________________    Power Supply _______________________

Power Supply Planning

Technical documentation

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Power Supply Configuration Worksheet