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18
IBM TotalStorage SAN Volume Controller: Installation Guide
output power is removed five minutes after the power was disconnected to
the UPS. Because this operation is controlled by the SAN Volume Controller,
a UPS that is not connected to an active SAN Volume Controller will not shut
off within the five-minute required period. In the case of an emergency, you
must manually shut down the UPS by pushing the UPS 5125 power off
button, or the UPS 5115 on/off button.
Attention:
Data integrity could be compromised by pushing the UPS 5125 power
off button or the UPS 5115 on/off button. Never shut down a UPS without first
shutting down the SAN Volume Controller nodes that it supports.
It is very important that the two nodes in the I/O group are connected to different
uninterruptible power supplies. This configuration ensures that cache and cluster
state information is protected in the event of a failure of the UPS or mainline power
source.
When nodes are added to the cluster, you must specify the I/O group that they will
join. The configuration interfaces also checks the UPS units and ensures that the
two nodes in the I/O group are not connected to the same UPS units.
Figure 8 shows a cluster of four nodes, with two I/O groups and two UPS 5125
units.
I/O group 1
Node 1
Node 2
Vdisks
Figure 8. I/O groups and uninterruptible power supply 5125 relationship
Related reference
"Controls and indicators for the uninterruptible power supply 5115" on page 19
All controls for the uninterruptible power supply 5115 are located on the front
panel assembly.
"Controls and indicators for the uninterruptible power supply 5125" on page 22
All controls for the uninterruptible power supply 5125 are located on the front
panel assembly.
"Hardware for the uninterruptible power supply 5115" on page 25
Diagrams of the hardware for the uninterruptible power supply (UPS) 5115 are
shown below:
"Hardware for the uninterruptible power supply 5125" on page 26
Diagrams of the hardware for the uninterruptible power supply (UPS) 5125 are
shown below:
I/O group 2
UPS 1
Node 3
UPS 2
Node 4
Vdisks
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