Compaq RAID ARRAY 3000 EK-SMCPO-UG. C01 - Manual (Page 23)

Product Overview 1-7
Compaq Confidential – Need to Know Required
Writer: Bob Young Project: RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide Comments:
Part Number: EK-SMCPO-UG. C01 File Name: b-ch1 Product Overview.doc Last Saved On: 12/4/00 1:51 PM
■ 32 Logical Unit (LUNs) per host channel (some operating systems may
be limited to 8)
■ Support for Hot and Warm spare disks
■ UPS-backed write caching
■ Per LUN write cache/write back selection
■ Configuration/Maintenance via RS-232 or host SCSI channel using
StorageWorks Command Console (SWCC)
■ Update of firmware via host channel
Pedestal Power Supplies
The pedestal has two interchangeable, air-cooled, AC power supply modules
located at the rear of the unit. The power supplies provide redundant power if
one of the units should malfunction. Each supply provides +5 and +12 VDC to
power the RAID controller, EMU, and the storage SBBs in the pedestal. In
addition, each unit contains a high-speed fan for pedestal cooling. The upper
power supply is designated as A and the lower as B. The unit contains an AC
power receptacle, a power status LED, a fan, and a latching slider switch to
secure the supply in the pedestal.
UPS
The UPS is separate and free-standing unit designed to protect the pedestal
from problems associated with poor quality AC power or a complete loss of
AC power. The UPS is connected between the AC outlet and the line input of
the pedestal power supply B to provide battery backup power.
The major features of the UPS include Cell Saver Technology (doubles battery
life and speeds recharge time), hot-swap batteries, and network surge
protection. The front panel display has user controls (LEDs and control
buttons) and the rear panel contains a COMM port, which provides UPS status
to the EMU in the pedestal. The rear panel also contains the network surge
protector, a reset button, and four power receptacles. An audible alarm is
activated when input power fails, as a Low Battery Warning, or whenever the
UPS is in need of servicing.
The UPS automatically recharges its battery when power is returned following
a power failure. Recharge time is four to six hours depending on the energy
requirements of your load and the length of the power outage.