4-4
Standby Power Supply (SPS)
Figure 4-2
SPS Installation, Front and Rear Views
If ac power fails, an SPS provides backup power until the storage
processor has flushed its write cache data to the DAE disks. The SP
then shuts off SPS power. If the cache flush has not completed within
90 seconds — more than enough time to flush a full cache — or if the
storage processor has failed, then the SPS shuts itself down to prevent
deep discharge. If there is no ac inlet power and the SPS is shut down,
all status lights will be off.
When power returns, the SPS starts recharging. It may reach a state of
full charge relatively quickly. If power remains off for a long period
— days or weeks — the battery may require more time to charge
fully. The recharge times are explained in Appendix A. The storage
processor will not use the write cache unless it detects at least one
fully charged SPS.
Battery lifetime depends on the number of discharge cycles and
depth of discharge. In a typical environment, a battery pack can last 3
to 5 years. Battery pack lifetime is shorter in locations that have
frequent ac outages.
EMC1967
Standby Power
Supply B (SPS B)
Standby Power
Supply A (SPS A)
Rear
Front
Mounting tray with
standby power supplies
(behind the bezel).
Содержание CLARiiON CX700
Страница 4: ...CX700 Hardware Reference iv ...
Страница 8: ...CX700 Hardware Reference viii Contents ...
Страница 18: ...xviii CX700 Hardware Reference Warnings and Cautions ...
Страница 56: ...2 26 CX700 Hardware Reference Setting Up and Starting a CX700 System ...
Страница 74: ...3 18 CX700 Hardware Reference Servicing a CX700 SPE ...
Страница 96: ...A 18 CX700 Hardware Reference Technical Specifications and Operating Limits ...
Страница 104: ...B 8 CX700 Hardware Reference Customer Support ...
Страница 110: ...g 6 CX700 Hardware Reference Glossary ...
Страница 114: ...CX700 Hardware Reference i 4 Index ...