2145 UPS-1U operation
Each SAN Volume Controller node monitors the operational state of the
uninterruptible power supply (UPS) to which it is attached.
If the UPS reports a loss of input power, the SAN Volume Controller node stops all
I/O operations and dumps the contents of its dynamic random access memory
(DRAM) to the internal disk drive. When input power to the UPS is restored, the
SAN Volume Controller node restarts and restores the original contents of the
DRAM from the data saved on the disk drive.
A SAN Volume Controller node is not fully operational until the UPS battery
charge state indicates that it has sufficient capacity to power the SAN Volume
Controller node long enough to save all of its memory to the disk drive. In the
event of a power loss, the UPS has sufficient power for the SAN Volume Controller
to save all its memory to disk at least twice. For a fully-charged UPS, even after
battery capacity has been used to power the SAN Volume Controller node while it
saves DRAM data, sufficient battery capacity remains to allow the SAN Volume
Controller node to become fully operational as soon as input power is restored.
Important: Do not shut down a UPS without first shutting down the SAN Volume
Controller node that it supports. Data integrity can be compromised by
pushing the 2145 UPS-1U on/off button when the node is still
operating. However, in the case of an emergency, you can manually
shut down the UPS by pushing the 2145 UPS-1U on/off button when
the node is still operating. Service actions must then be performed
before the node can resume normal operations. If multiple UPSs are
shut down before the nodes they support, data can be corrupted.
Controls and indicators for the 2145 UPS-1U
All controls for the 2145 uninterruptible power supply-1U (2145 UPS-1U) are
located on the front panel assembly.
1
Power-on indicator
2
On/off button
3
Test and alarm reset button
4
Overload indicator
+ -
LOAD 1LOAD 2
1yyzvm
5
6
7
8
1
2
3
4
Figure 8. The 2145 UPS-1U front panel assembly
24 IBM System Storage SAN Volume Controller: Hardware Installation Guide
|
To Next Page
Loading...
Need help?
General
