Product manual

77 A1 69UP Rev00 ix
5.2 Reliability and Availability Features .............................................................................5-4
5.2.1 Reliable Components .....................................................................................5-4
5.2.2 Redundant Power Subsystem ........................................................................5-4
5.2.3 System Battery Backup..................................................................................5-4
5.2.3.1 CDA 7 Power Failure on GCOS 7 Channels Connected to
GCOS 7 .........................................................................................5-5
5.2.4 Dual-Initiator Feature......................................................................................5-5
5.2.5 Non-disruptive Component Replacement........................................................5-9
5.2.6 Microcode Upgrades and Loads ...................................................................5-10
5.2.6.1 Non-disruptive Microcode Upgrades and Loads............................5-10
5.2.6.2 Dynamic Reconfigurations ............................................................5-11
5.2.6.3 Online SCSI-to-Fibre Channel Migration .......................................5-11
5.3 Data Integrity Protection............................................................................................5-12
5.3.1 Error Checking, Correction, and Data Integrity Protection .............................5-12
5.3.1.1 Parity............................................................................................5-13
5.3.1.2 ECC .............................................................................................5-13
5.3.1.3 LRC..............................................................................................5-13
5.3.2 Disk Error Correction and Error Verification ..................................................5-13
5.3.3 Cache Error Correction and Error Verification...............................................5-14
5.4 Data Protection Guidelines........................................................................................5-14
5.5 Mirroring ...................................................................................................................5-15
5.5.1 Write Operations with Mirroring ....................................................................5-15
5.5.2 Read Operations with Mirroring ....................................................................5-15
5.5.3 Error Recovery with Mirroring.......................................................................5-16
5.5.4 Mirroring Advantages ...................................................................................5-16
5.6 SRDF for GCOS 7 ....................................................................................................5-16
A. Power Sequences
A.1 Powering Up the CDA 7............................................................................................. A-1
A.2 Routinely Powering Down CDA .................................................................................. A-2
A.3 Emergency Powering Down ....................................................................................... A-2
A.4 Powering Up After an Emergency Shutdown .............................................................. A-3
B. ESP Installation Requirements
B.1 CDA 7 Hardware Checklist......................................................................................... B-1
B.2 Open Checklists for ESP Connection ......................................................................... B-2
B.3 SCSI Cable Worksheet .............................................................................................. B-4
B.4 ULTRA SCSI Channel Adapters................................................................................. B-5