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
Stripe Unit size:
This parameter should be chosen such that the stripe unit size
is close to the size of the system I/O requests. The default is set to 8KB.
Note: Once data is stored in the logical drive, the stripe unit cannot be changed
without destroying data in the logical drives.
Rebuild Priority:
This parameter sets the priority of the execution order of the
rebuild I/O requests with respect to the system I/O requests. The rebuild priority
can be changed without affecting data in the logical drive.
Parity placement:
Parity placement defines how parity is placed in the disk
array with respect to the data. The following figure shows the differences
between Left Symmetric and Right Asymmetric parity placement.
AAA, BBB, CCC and so on are the data stripe units; PP1-3 are the corresponding
parity.
Right Asymmetric (RA) Left Symmetric (LS)
Disk Disk Disk Disk Disk Disk Disk Disk
1 2 3 4 1 2 3 4
PP0 AAA BBB CCC AAA BBB CCC PP0
DDD PP1 EEE FFF EEE FFF PP1 DDD
GGG HHH PP2 III III PP2 GGG HHH
JJJ KKK LLL PP3 PP3 JJJ KKK LLL
The default value is Right Asymmetric. In some situations, you may want to try
Left Symmetric to improve performance.
Note: Once a parity placement scheme is chosen and data is stored in the
logical drives, it cannot be changed without destroying data in the logical drives.
Read-Ahead:
Normally the IBM SCSI-2 Fast/Wide Streaming RAID adapter
transfers data from a disk to its local cache in steps of stripe unit size. This
provides excellent overall performance when workloads tend to be sequential.
However, if the workload is random and system I/O requests are smaller than
stripe unit size, reading ahead to the end of the stripe unit will result in a wasted
SCSI bus bandwidth and wasted disk utilization.
When Read-Ahead is set to OFF, the size of data transfer from the disk to the
local cache is equal to the system I/O request size, and no read-ahead to the
end of the stripe unit size is performed.
Note: The Read-Ahead setting can be modified without destroying data in a
logical unit.
3.5.3 Defining a Hot-Spare Disk
After selecting Create/delete array from the main menu of the IBM RAID
Configuration program, the following screen appears:
106 NetWare Integration Guide