Compaq StorageWorks TM RAID Array 3000 Pedestal Storage Subsystem Hardware User's Manual page 4

Controller Overview ..................................................................................................2-1
Controller Features ....................................................................................................2-3
Controller Reset and LED Indicators ........................................................................2-8
Flexible RAID Set Configuration..............................................................................2-9
Performance Enhancements ....................................................................................2-10
Custom Components ........................................................................................2-10
Efficient Write and Read Algorithms...............................................................2-11
RAID Levels Supported ..........................................................................................2-13
RAID 0 .............................................................................................................2-14
RAID 1 .............................................................................................................2-16
RAID 0+1 .........................................................................................................2-16
RAID 4 .............................................................................................................2-18
RAID 5 .............................................................................................................2-19
Just a Bunch of Drives (JBOD)........................................................................2-21
Redundant Operation ...............................................................................................2-21
Initialization......................................................................................................2-21
Message Passing...............................................................................................2-22
Failover.............................................................................................................2-22
Environmental..........................................................................................................2-22
Backup Power Management.............................................................................2-22
Voltage Monitoring ..........................................................................................2-24
Temperature Monitoring ..................................................................................2-26
Pedestal Status and Power LEDs...............................................................................3-2
SBB Status LEDs.......................................................................................................3-3
Controller LEDs.........................................................................................................3-4
EMU Error Reporting ................................................................................................3-5
EMU Error Conditions .......................................................................................3-6
Replacing Components (FRUs).................................................................................3-7
Removing the Pedestal Door..............................................................................3-8
Replacing an SBB ..............................................................................................3-9
Replacing a Power Supply ...............................................................................3-10
Replacing the RAID Array Controller .............................................................3-12
Replacing the EMU Board ...............................................................................3-13
Replacing the UPS............................................................................................3-15
Differential/Wide UltraSCSI Bus............................................................................3-15
Reconfiguring the SCSI Bus ............................................................................3-16
Replacing the Controller Memory Cache Modules.................................................3-20