User manual
Table Of Contents
- SuperTrak User Manual
- Contents
- Chapter 1: Introduction
- Chapter 2: Installation
- Unpacking the SuperTrak Card
- Installing the SuperTrak Card
- Choosing the Physical Drives
- Creating a Logical Drive
- Installing the CLI
- Installing WebPAM PRO
- Logging into WebPAM PRO
- Setting up WebPAM PRO
- Chapter 3: Installing Drivers
- Chapter 4: SuperBuild™ Utility
- Chapter 5: Management with WebPAM PRO
- Logging into WebPAM PRO
- Accessing the Interface
- Managing Users
- Working with Subsystem/Host Management
- Managing Software Services
- Managing the Host
- Managing the Subsystem
- Viewing Subsystem Information
- Clearing Statistical Data
- Setting an Alias for the Subsystem
- Updating the Firmware
- Checking Subsystem Health
- Viewing the Runtime Event Log
- Saving the Runtime Event Log
- Clearing the Runtime Event Log
- Viewing the NVRAM Event Log
- Saving the NVRAM Event Log
- Clearing the NVRAM Event Log
- Viewing Current Background Activities
- Making Background Activity Settings
- Running Background Activities
- Running Media Patrol
- Running PDM
- Viewing Scheduled Activities
- Scheduling an Activity
- Deleting a Scheduled Activity
- Viewing System Configuration
- Managing the Controller
- Managing Enclosures
- Managing Physical Drives
- Viewing a List of Physical Drives
- Locating a Physical Drive
- Making Global Physical Drive Settings
- Viewing Physical Drive Information
- Viewing Physical Drive Statistics
- Making Physical Drive Settings
- Clearing Stale and PFA Conditions
- Viewing the SMART Log
- Viewing Advanced SMART Log Information
- Saving Advanced SMART Log Information
- Making SMART Log Settings
- Managing Disk Arrays
- Viewing Disk Arrays
- Locating a Disk Array
- Creating a Disk Array
- Creating a Disk Array - Automatic Configuration
- Creating a Disk Array - Express Configuration
- Creating a Disk Array - Advanced Configuration
- Deleting a Disk Array
- Viewing Disk Array Information
- Making Disk Array Settings
- Creating a Logical Drive
- Deleting a Logical Drive
- Migrating a Disk Array
- Rebuilding a Disk Array
- Running Media Patrol on a Disk Array
- Running PDM on a Disk Array
- Transitioning a Disk Array
- Preparing a Disk Array for Transport
- Managing Logical Drives
- Managing Spare Drives
- Working with the Logical Drive Summary
- Chapter 6: Management with the CLI
- Opening the CLI on Windows
- Opening the CLI on Linux, FreeBSD, and VMware
- Table of Supported Commands
- Notes and Conventions
- List of Supported Commands
- Chapter 7: Technology Background
- Chapter 8: Troubleshooting
- Chapter 9: Support
- Appendix A: Partition and Format
- Appendix B: Upgrades
- Appendix C: Battery Backup Unit
- Appendix D: LED Backplane Connections
- Index
Chapter 7: Technology Background
229
RAID 1 – Mirror
When a logical drive is mirrored, identical data is written to a pair of physical
drives, while reads are performed in parallel. The reads are performed using
elevator seek and load balancing techniques where the workload is distributed in
the most efficient manner. Whichever drive is not busy and is positioned closer to
the data will be accessed first.
With RAID 1, if one physical drive fails or has errors, the other mirrored physical
drive continues to function. Moreover, if a spare physical drive is present, the
spare drive will be used as the replacement drive and data will begin to be
mirrored to it from the remaining good drive.
Figure 2. RAID 1 Mirrors identical data to two drives
The logical drive’s data capacity equals the smaller physical drive. For example,
a 100 GB physical drive and a 120 GB physical drive have a combined capacity
of 100 GB in a mirrored logical drive.
If physical drives of different capacities are used, there will be unused capacity
on the larger drive.
RAID 1 logical drives on SuperTrak consist of two physical drives.
If you want a mirrored logical drive with more than two physical drives, see
“RAID 1E – Enhanced Mirror” on page 230 and “RAID 10 – Mirror / Stripe” on
page 233.
Data Mirror
Physical Drives