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Chapter 4 Powering On the Array 63
■ The green OK/Power LED on the tray is steady on.
If all tray and drive Ok/Power LEDs are steady green and the amber Service
Required LEDs are off, the power-on sequence is complete and no faults have
been detected.
Powering Off the Array
The array rarely needs to be powered off. You remove power only when you plan to
physically move the array to another location or are adding additional trays to a
controller.
To power off the array, do the following:
1. Stop all I/O from the hosts, if connected, to the storage system.
2. Wait approximately 2 minutes until all disk drive LEDs have stopped flashing.
Note – If Disk Scrubbing is enabled, the disk drive LEDs will continue to flash after
the 2-minute period has elapsed. By waiting the 2-minute period, you ensure that
the data residing in cache has been written to disk. The LED flash rate during disk
scrubbing (slow, periodic blink) is different from the flash rate of I/O (fast, random).
After the 2-minute period, data residing in cache is written to disk and the
battery mechanisms are disengaged.
3. Check the Cache Active LED on the controller (
FIGURE 1-10) to determine if any
outstanding cache needs to be written.
If the LED is on, there is still data that needs to be flushed and written to disk.
4. Ensure that the Cache Active LED is no longer flashing before powering off the
array.
5. Press each power switch at the back of the controller tray to the Off position.
6. Press the power switches at the back of each expansion tray to the Off position.