HP LH4r HP NetServer FCArray Assistant - Installation and User Guide - Page 143

Using the Shutdown Feature

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Chapter 6 Maintenance Processes 11. Click OK to request controller reset at this time. See Figure 6-15. CAUTION Resetting the controller will suspend all I/O activity currently underway on the selected controller; therefore confirmation is required to proceed with the reset. See Figure 6-16. Figure 6-16. Confirmation to Reset the Controller 12. Click Yes in the confirmation message. See Figure 6-16. 13. At the Flash Utility dialog box, click Cancel to return to where you were before the flash operation. Using the Shutdown Feature The shutdown feature should only be used when performing maintenance on the Rack Storage/12FC (or FCArray Controller Card) where AC power will be disconnected for more than 48 hours. The Shutdown dialog box provides a clean shutdown of the FCArray Controllers in three ways. See Figure 6-17. The Shutdown dialog box: • Flushes the cache (writing any user data to disk) • Automatically shifts to conservative cache mode • Electrically disconnects the BBU (maintains the battery's charge level without drawing on battery power) If power were removed from the system without a clean shutdown, the BBUs would keep the RAM data intact until all battery power was exhausted. This would have several undesirable affects, such as: ◊ Shortening useful battery life (there is a limit to the number of discharge-charge cycles, which causes the BBUs to age.) ◊ Potential loss of user data 137

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Chapter 6
Maintenance Processes
137
11.
Click
OK
to request controller reset at this time. See Figure 6-15.
CAUTION
Resetting the controller will suspend all I/O activity currently
underway on the selected controller; therefore confirmation is
required to proceed with the reset. See Figure 6-16.
Figure 6-16. Confirmation to Reset the Controller
12.
Click
Yes
in the confirmation message. See Figure 6-16.
13.
At the Flash Utility dialog box, click
Cancel
to return to where you were
before the flash operation.
Using the Shutdown Feature
The shutdown feature should only be used when performing maintenance on the
Rack Storage/12FC (or FCArray Controller Card) where AC power will be
disconnected for more than 48 hours. The Shutdown dialog box provides a clean
shutdown of the FCArray Controllers in three ways. See Figure 6-17.
The Shutdown dialog box:
•
Flushes the cache (writing any user data to disk)
•
Automatically shifts to conservative cache mode
•
Electrically disconnects the BBU (maintains the battery’s charge level
without drawing on battery power)
If power were removed from the system without a clean shutdown, the
BBUs would keep the RAM data intact until all battery power was
exhausted. This would have several undesirable affects, such as:
◊
Shortening useful battery life (there is a limit to the number of
discharge-charge cycles, which causes the BBUs to age.)
◊
Potential loss of user data