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Specifications 33
Relative humidity (noncondensing)
Operating, 10% to 90%
Storage, 5% to 90%
Time required to recharge battery
1
From 15 minutes to 2 hours 40 minutes, depending on the initial battery
charge level
Duration of battery backup
1
If the battery is fully charged and less than 3 years old, more than 2 days
The battery pack provides a continuous charge to store the cached data
in DDR memory.
Battery life expectancy
1
3 years
For more information, see "Battery pack service life (on page 36)."
Time required to recharge
capacitor
2
5 minutes or less
Duration of capacitor backup
2
80 seconds
The capacitor pack provides a sufficient duration to transfer the cached
data from DDR memory to flash memory, where the data remains
indefinitely or until a controller retrieves the data.
Capacitor life expectancy
2
More than 3 years
Mini-SAS connector life
expectancy
250 connect/disconnect cycles (for external, internal, and cable
Mini-SAS connectors)
Supported drive types
3
•
3.0-Gb/s SAS drives
•
6.0-Gb/s SAS drives
•
1.5-Gb/s SATA drives
•
3.0-Gb/s SATA drives (on systems that support 6.0-Gb/s SAS drives)
•
6.0-Gb/s SATA drives
Not all servers or storage systems support all SAS or SATA drive types.
For product-specific drive support, see the product QuickSpecs on the HP
website (http://www.hp.com/go/bizsupport).
OBDR tape drives are also supported. For more information about OBDR,
see the HP website (http://www.hp.com/go/obdr).
Maximum number of logical drives
64
1
For controllers that use battery-backed write cache
2
For controllers that use flash-backed write cache
3
Not all servers support all drive types. For more information, see the server QuickSpecs on the HP website
(http://www.hp.com/go/bizsupport).
Controller specifications by model
E500, P411, and P421 specifications
Specification E500 P411 P421
Board type
Low-profile, PCIe stand-up
board
Low-profile, PCIe stand-up
board
Low-profile, PCIe stand-up
board
Dimensions, cm*
16.8 x 7.0 x 1.8 16.8 x 7.0 x 1.8 16.8 x 6.9 x 1.7
Dimensions, in*
6.6 x 2.8 x 0.7 6.6 x 2.8 x 0.7 6.6 x 2.7 x 0.6
Maximum number of
physical drives
100 external 100 external
(controller does not operate
without cache)
200 external
(controller does not operate
without cache)
Maximum power required
(approximate)
14 W 12 W 14 W