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Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide
Figures
Basic Building Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
Bridging the Gap Between the Host and Its Storage Subsystem . . . . . . . . . . . . . . 1–7
HSZ80 Array Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–9
Parts Used in Configuring the HSZ80 Array Controller . . . . . . . . . . . . . . . . . . . 1–10
Optional Maintenance Port Cable for a Terminal Connection . . . . . . . . . . . . . . . 1–12
Location of Controllers and Cache Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–13
HSZ80 Controller Operator Control Panel (OCP) . . . . . . . . . . . . . . . . . . . . . . . . 1–14
Cache Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–19
ECB for Dual-Redundant Controller Configurations . . . . . . . . . . . . . . . . . . . . . . 1–30
Cabling for a Single-Controller Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
Cabling for a Dual-Redundant Controller Configuration in
Transparent Failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10
Cabling for a Dual-Redundant Controller Configuration in
Multiple-Bus Failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16
SCSI Target ID Numbers on the Controller Device Bus and PVA Settings in
an Extended Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–25
PC/Terminal to Maintenance Port Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–27
“This Controller” and “Other Controller” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–28
Host SCSI Bus and Controller Device Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–33
Units Created from Storagesets, Partitions, and Drives . . . . . . . . . . . . . . . . . . . . . 3–3
Storageset Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6
Striping Lets Several Disk Drives Participate in Each I/O Request . . . . . . . . . . . . 3–9
Distribute Members across Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–11
Mirrorsets Maintain Two Copies of the Same Data . . . . . . . . . . . . . . . . . . . . . . . 3–13
First Mirrorset Members on Different Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–14
Parity Ensures Availability; Striping Provides Good Read Performance . . . . . . . 3–16
Striping and Mirroring in the Same Storageset . . . . . . . . . . . . . . . . . . . . . . . . . . 3–18
CLONE Steps for Duplicating Unit Members . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–21