User Manual
Table Of Contents
- ROMB User Manual
- Contents
- Chapter 1: Introduction
- Chapter 2: Installation
- Chapter 3: Installing Drivers
- Chapter 4: RAID Management Utility
- Chapter 5: WebPAM
- Logging into WebPAM
- Logging out of WebPAM
- Managing Users
- Viewing Host Management
- Making Utility Configuration Settings
- Managing the Controller
- Managing Physical Drives
- Managing Logical Drives
- Viewing All Logical Drives
- Creating a Logical Drive
- Creating a JBOD Disk
- Deleting a Logical Drive or JBOD Disk
- Viewing Logical Drive Information
- Making Logical Drive Settings
- Migrating a Logical Drive
- Rebuilding a Logical Drive
- Synchronizing a Logical Drive
- Viewing Logical Drive Initialization
- Activating a Logical Drive
- Responding to a Critical or Offline Logical Drive
- Managing Spare Drives
- Chapter 6: Technology
- Chapter 7: Support
- Appendix A: Partition and Format
- Appendix B: Upgrades
- Index
Software ROMB User Manual
100
RAID 5 – Block Striping with Distributed Parity
RAID 5 organizes block data and parity data across the physical drives.
Generally, RAID Level 5 tends to exhibit lower random write performance due to
the heavy workload of parity recalculation for each I/O. RAID 5 is generally
considered to be the most versatile RAID level. It works well for file, database,
application and web servers.
Figure 3. RAID 5 Stripes all drives with data and parity information
The capacity of a RAID 5 logical drive is the smallest physical drive size
multiplied by the number of physical drives, less one. Hence, a RAID 5 logical
drive with four 100 GB physical drives will have a capacity of 300 GB. A logical
drive with two 120 GB physical drives and one 100 GB physical drive will have a
capacity of 200 GB.
RAID 5 is generally considered to be the most versatile RAID level.
A RAID 5 logical drive requires 3 to 6 physical drives.
Data
Blocks
Distributed Parity
Physical Drives