Compaq External RAID Controller & Subsystem Manual do Utilizador Página 4

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Table of Contents
Chapter 1 RAID Functions: An Introduction
1.1 Logical Drive...................................................................................................1
1.2 Logical Volume...............................................................................................1
What is a logical volume?..................................................................................1
1.3 RAID Levels.....................................................................................................2
What are the RAID levels?................................................................................2
NRAID................................................................................................................3
JBOD.................................................................................................................3
RAID 0...............................................................................................................4
RAID 1...............................................................................................................4
RAID (0+1).........................................................................................................4
RAID 3...............................................................................................................5
RAID 5...............................................................................................................5
1.4 Spare Drives ...................................................................................................6
Global and Local Spare Drives..........................................................................6
1.5 Identifying Drives...........................................................................................8
Flash Selected SCSI Drive................................................................................8
Flash All SCSI Drives ........................................................................................8
Flash All but Selected Drives.............................................................................8
1.6 Rebuild ............................................................................................................9
Automatic Rebuild and Manual Rebuild.............................................................9
1. Automatic Rebuild........................................................................................9
2. Manual Rebuild...........................................................................................10
3. Concurrent Rebuild in RAID (0+1)..............................................................11
1.7 Logical Volume (Multi-Level RAID).............................................................12
What is a logical volume?................................................................................12
Spare drives assigned to a logical volume? ....................................................14
Limitations:.......................................................................................................15
Partitioning - partitioning the logical drive or partitioning the logical volume? .15
Different write policies within a logical volume?...............................................16
RAID expansion with logical volume?..............................................................16
Different controller settings using logical volume? ..........................................16
A logical volume with logical drives of different levels?...................................17
Multi-level RAID systems.................................................................................17
Chapter 2 RAID Planning
2.1 Considerations...............................................................................................1
2.2 Configuring the Array:...................................................................................5
2.2.1 Starting a RAID System...........................................................................5
2.3 Operation Theory ...........................................................................................7
2.3.1 I/O Channel, SCSI ID, and LUN ..............................................................7
2.3.2 Grouping Drives into an Array .................................................................7
2.3.3 Making Arrays Available to Hosts............................................................9
2.4 Tunable Parameters.....................................................................................10
Chapter 3 Accessing the Array through Serial Port and Ethernet
3.1 RS-232C Serial Port.......................................................................................1
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