SPS Technical Specifications
A-15
Technical Specifications and Operating Limits
Battery Tests
Battery Self-Discharge Times
When you store an SPS, the battery charge level naturally decreases
over time. This is characteristic of all rechargable batteries. The rate of
self-discharge depends on temperature. Lower storage temperatures
are desirable since the self-discharge rate is lower. The following
graph shows how the remaining charge decreases over time at
different temperatures.
Figure A-1
Typical SPS Self-Discharge Levels at Different Storage Temperatures
Internal
Within 60 minutes after powerup and approximately every 2 weeks
thereafter, the SPS performs a light test on the batteries. This test lasts less
than one second. It does not verify battery capacity but does check
connectivity and functionality. This test is transparent to other components in
the array. If an actual power failure occurs during the test, the test is
terminated and the unit goes into On-Battery mode.
Full
At each storage system startup, the system software initiates a full power
test. During the test, the system disables write cache and allows the SPS to
stay on for its entire 90-second period.
The system initiates a full test when the SPS is On-Line and fully charged. If
the batteries are charging at test time, the system defers the test until the
next programmed time.
Avoid allowing the battery
to discharge below this
level to allow full recharge
within the SPS time limit.
20 degrees C (68 F)
30 degrees C (88 F)
40 degrees C (104 F)
100
90
80
70
60
50
40
30
20
10
0
3
6
9
12
15
18
Remaining Capacity (%)
Storage Time (Months)
EMC2447
Summary of Contents for CLARiiON CX700
Page 4: ...CX700 Hardware Reference iv ...
Page 8: ...CX700 Hardware Reference viii Contents ...
Page 18: ...xviii CX700 Hardware Reference Warnings and Cautions ...
Page 56: ...2 26 CX700 Hardware Reference Setting Up and Starting a CX700 System ...
Page 74: ...3 18 CX700 Hardware Reference Servicing a CX700 SPE ...
Page 96: ...A 18 CX700 Hardware Reference Technical Specifications and Operating Limits ...
Page 104: ...B 8 CX700 Hardware Reference Customer Support ...