Specifications
Table Of Contents
- IBM PC Server and Novell NetWare Integration Guide
- Abstract
- Contents
- Figures
- Tables
- Special Notices
- Preface
- Chapter 1. IBM PC Server Technologies
- Processors
- Clock Rate
- External Interfaces
- Processor Types
- Multiprocessing
- Memory
- Caches
- Memory Interleaving
- Dual Path Buses
- SynchroStream Technology
- Memory Error Detection and Correction
- Standard (Parity) Memory
- Error Correcting Code (ECC)
- Error Correcting Code- Parity Memory (ECC- P)
- ECC on SIMMs (EOS) Memory
- Performance Impact
- Memory Options and Speed
- Bus Architectures
- ISA Bus
- EISA Bus
- Micro Channel Bus
- PCI Bus
- Disk Subsystem
- Hard Disk Interfaces
- SCSI Technology
- SCSI Adapters
- Hard Disk Drives
- RAID Technology
- RAID Classifications
- Recommendations
- LAN Subsystem
- Shared RAM Adapters
- Bus Master Adapters
- PeerMaster Technology
- Security Features
- Tamper- Evident Cover
- Secure I/ O Cables
- Passwords
- Secure Removable Media
- Selectable Drive Startup
- Unattended Start Mode
- Systems Management
- DMI
- SNMP
- NetFinity
- SystemView
- Fault Tolerance
- NetWare SFT III
- Uninterruptible Power Supply (UPS)
- APC PowerChute
- Chapter 2. IBM PC Server Family Overview
- Chapter 3. Hardware Configuration
- The Setup Program
- Main Menu
- Advanced Menu
- Security
- EISA Configuration Utility
- SCSI Select Utility Program
- System Programs
- Starting From the System Partition
- Starting From the Reference Diskette
- Main Menu Options
- Backup/ Restore System Programs Menu
- Set Configuration Menu
- Set Features Menu
- Test the Computer
- More Utilities Menu
- Advanced Diagnostic Program
- RAID Controller Utility
- Drive Information
- Formatting the Disks
- Defining a Hot- Spare Disk
- Creating a Disk Array
- Defining Logical Drives
- Setting the Write Policy
- Initializing the Array
- Backup/ Restoring the Configuration
- Chapter 4. Novell NetWare Installation
- ServerGuide Overview
- Starting ServerGuide
- Installing NetWare 4.1 with ServerGuide
- Installing NetWare 3.12 with Diskettes
- Hardware Requirements
- Software Requirements
- Information Requested at Time of Installation
- Installation Files
- Installation Procedure
- Installing NetWare 4.1 with the Original CD- ROM
- Hardware Requirements
- Software Requirements
- Installation Procedure
- NetFinity Services for NetWare
- System Requirements
- Installing NetFinity Services for NetWare
- The RAID Administration for NetWare Utility
- Installing the Utility
- Hard Disk Failure Simulation
- Simulating with a Hot Spare Drive
- Simulating without a Hot Spare Drive
- Chapter 5. Performance Tuning
- Appendix A. EISA Configuration File
- Appendix B. Hardware Compatibility, Device Driver, and Software Patch Information
- Appendix C. Configuring DOS CD-ROM Support
- List of Abbreviations
- Index
- Special Characters C
- Numerics
- A
- B
- D
- E
- F
- H
- M
- I
- N
- K
- L
- O
- P
- S
- Q
- R
- T
- U
- V
- W
- Z
- ITSO Technical Bulletin Evaluation RED000
Disks are often among the least reliable components of the computer
systems, yet the failure of a disk can result in the unrecoverable loss of vital
business data, or at the very least a need to restore from tape with
consequent delays.
•
Cost
It is cheaper to provide a given storage capacity and a given performance
level with several small disks connected together than with a single disk.
There is nothing unusual about connecting several disks to a computer to
increase the amount of storage. Mainframes and minicomputers have always
had banks of disks. It becomes a disk array when several disks are connected
and accessed by the disk controller in a predetermined pattern designed to
optimize performance and/or reliability.
Disk arrays seem to have been invented independently by a variety of groups,
but it was the Computer Architecture Group at the University of California,
Berkeley who invented the term RAID. RAID stands for
Redundant Array of
Inexpensive Disks
and provides a method of classifying the different ways of
using multiple disks to increase availability and performance.
1.6.6 RAID Classifications
The original RAID classification described five levels of RAID (RAID-1 through 5).
RAID-0 (data-striping) and RAID-1 Enhanced (data stripe mirroring) have been
added since the original levels were defined. RAID-0 is not a pure RAID type,
since it does not provide any redundancy.
Different designs of arrays perform optimally in different environments. The two
main environments are those where high transfer rates are very important, and
those where a high I/O rate is needed, that is, applications requesting short
length random records.
Table 6 shows the RAID array classifications, and is followed by brief
descriptions of their designs and capabilities.
Table 6. RAID Classifications
RAID Level Description
RAID-0 Block Interleave Data Striping without Parity
RAID-1 Disk Mirroring/Duplexing
RAID-1 (Enhanced) Data Stripe Mirroring
RAID-2 Bit Interleave Data Striping with Hamming Code
RAID-3 Bit Interleave Data Striping with Parity Disk
RAID-4 Block Interleave Data Striping with one Parity Disk
RAID-5 Block Interleave Data Striping with Skewed Parity
Chapter 1. IBM PC Server Technologies 23