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
1.6.6.8 Summary of RAID Performance Characteristics
RAID-0:
Block Interleave Data Striping without parity
•
Fastest data-rate performance
•
Allows seek and drive latency to be performed in parallel
•
Significantly outperforms single large disk
RAID-1:
Disk Mirroring/Disk Duplexing and Data Strip mirroring (RAID-1,
Enhanced)
•
Fast and reliable, but requires 100% disk space overhead
•
Data copied to each set of drives
•
No performance degradation with a single disk failure
•
RAID-1 enhanced provides mirroring with an odd number of drives
RAID-2:
Bit Interleave Data Striping with Hamming Code
•
Very fast for sequential applications, such as graphics modelling
•
Almost never used with PC-based systems
RAID-3:
Bit Interleave Data Striping with Parity
•
Access to all drives to retrieve one record
•
Best for large sequential reads
•
Very poor for random transactions
•
Poor for any write operations
•
Faster than a single drive, but much slower than RAID-0 or RAID-1 in random
environments
RAID-4:
Block Interleave Data Striping with one Parity Disk
•
Best for large sequential I/O
•
Very poor write performance
•
Faster than a single drive, but usually much slower than RAID-0 or RAID-1
RAID-5:
Block Interleave Data Striping with Skewed Parity
•
Best for random transactions
•
Poor for large sequential reads if request is larger than block size
•
Better write performance than RAID-3 and RAID-4
•
Block size is key to performance, must be larger than typical request size
•
Performance degrades in recovery mode (when a single drive has failed)
Table 7. Summary of RAID Performance Characteristics
RAID Level Capacity Large Transfers High I/O Rate Data Availability
Single Disk Fixed (100%) Good Good 1
RAID-0 Excellent Very Good Very Good Poor 2
RAID-1 Moderate (50%) Good Good Good
RAID-2 Very Good Good Poor Good
RAID-3 Very Good Very Good Poor Good
RAID-4 Very Good Very Good Poor Good
RAID-5 Very Good Very Good Good Good
Note:
1 The MTBF (mean time before failure) for single disks can range from 10,000 to 1,000,000 hours.
2 Availability = MTBF of one disk divided by the number of disks in the array.
30 NetWare Integration Guide