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 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, 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.
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 | NOTE: Battery backup functionality on the Series 890 system
is not supported by MC/LockManager. |
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Power Supply Configuration Worksheet |
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The following worksheet will help you organize and record
your specific power supply configuration. Make as many copies as
you need. Fill out the worksheet and keep it for future reference.
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===============================================================================
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 _______________________
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Printable version
