- Notes, cautions, and warnings
- Overview
- Getting Started
- Understanding RAID concepts
- What is RAID?
- Organizing Data Storage For Availability And Performance
- Choosing RAID Levels And Concatenation
- Concatenation
- RAID level 0 (striping)
- RAID level 1 (mirroring)
- RAID level 5 (striping with distributed parity)
- RAID level 6 (striping with additional distributed parity)
- RAID level 50 (striping over RAID 5 sets)
- RAID level 60 (striping over RAID 6 sets)
- RAID level 10 (striped-mirrors)
- RAID Level 1-Concatenated (Concatenated Mirror)
- Comparing RAID Level And Concatenation Performance
- No-RAID
- Quick Access To Storage Status And Tasks
- Storage Health
- Hot Spare Protection Policy
- Storage Component Severity
- Storage Properties And Current Activity
- Alerts Or Events
- Monitoring Disk Reliability On RAID Controllers
- Using Alarms To Detect Failures
- Using Enclosure Temperature Probes
- Rescanning To Update Storage Configuration Changes
- Time Delay In Displaying Configuration Changes
- PCI Express Solid-State Device Support
- What Is PCIe SSD?
- PCIe SSD Features
- PCIe SSD Subsystem Properties
- PCIe Extender Cards
- Physical Device Properties
- Physical Device Tasks
- PCIe SSD In Slot Card Properties
- PCIe SSD In Slot Card Tasks
- PCIe SSD Subsystem Health
- Storage Information And Global Tasks
- Controllers
- What Is A Controller?
- RAID Controller Technology: SATA And SAS
- RAID Controller Features
- Controller — Supported RAID Levels
- Controller — Supported Stripe Sizes
- RAID Controller Read, Write, Cache, And Disk Cache Policy
- Background Initialization On PERC Controllers
- Non-RAID Controller Description
- Firmware Or Driver Versions
- Controller Health
- Controllers Properties And Tasks
- Controller Tasks
- Rescanning The Controller
- Creating A Virtual Disk
- Enabling The Controller Alarm
- Disabling The Controller Alarm
- Turning Off The Controller Alarm
- Testing The Controller Alarm
- Setting The Rebuild Rate
- Resetting The Controller Configuration
- Exporting The Controller Log File
- Foreign Configuration Operations
- Importing Foreign Configurations
- Importing Or Recovering Foreign Configurations
- Clearing Foreign Configuration
- Physical Disks In Foreign Virtual Disks
- Setting Background Initialization Rate
- Setting The Check Consistency Rate
- Setting The Reconstruct Rate
- Setting The Redundant Path Configuration
- Setting The Patrol Read Mode
- Starting And Stopping Patrol Read
- Changing The Controller Properties
- Managing The Physical Disk Power
- Properties In Manage Physical Disk Power Option
- Physical Disk Power On Unconfigured Drives And Hot Spares
- Managing Physical Disk Power Using The Customized Power Savings Mode
- Managing Physical Disk Power Using The QoS Option
- Managing The Time Interval For The QoS Option
- To Locate Manage Physical Disk Power In Storage Management
- Managing The Preserved Cache
- Encryption Key
- Converting To Non-RAID Disks
- Converting To RAID Capable Disks
- Changing The Controller Mode
- Auto Configure RAID0 Operation
- Viewing Available Reports
- Support For PERC 9 Hardware Controllers
- Enclosures And Backplanes
- Backplanes
- Enclosures
- Enclosure Physical Disks
- Enclosure Fans
- Enclosure Power Supplies
- Enclosure Temperature Probes
- Enclosure Management Modules (EMMs)
- Enclosure And Backplane Health
- Enclosure And Backplane Properties And Tasks
- Changing The Mode On 220S And 221S Enclosures
- Enclosure Management
- Identifying An Open Connector On The Enclosure
- Enclosure Components
- Connectors
- Tape Drive
- RAID Controller Batteries
- Physical Disks Or Physical Devices
- Guidelines To Replace A Physical Disk Or Physical Device
- Adding A New Disk To The System
- Replacing A Physical Disk Receiving SMART Alerts
- Other Disk Procedures
- Physical Disk Or Physical Device Properties
- Physical Disk Or Physical Device Tasks
- Physical Disk Tasks
- Blinking And Unblinking A Physical Disk
- Removing Dead Segments
- Preparing To Remove
- Rebuilding Data
- Canceling A Rebuild
- Assigning And Unassigning Global Hot Spare
- Setting The Physical Disk Online Or Offline
- Performing A Clear Physical Disk And Cancel Clear
- Enabling Revertible Hot Spare
- Enabling Instant Encrypt Erase
- Convert To RAID Capable Disk
- Convert To Non-RAID Disk
- Virtual Disks
- Considerations Before Creating Virtual Disks
- Virtual Disk Considerations For Controllers
- Virtual Disk Considerations For PERC S100, S110, S130, And S300 Controllers
- Virtual Disk Considerations On Systems Running Linux
- Number Of Physical Disks Per Virtual Disk
- Number Of Virtual Disks Per Controller
- Calculation For Maximum Virtual Disk Size
- Channel-Redundant Virtual Disks
- Creating Virtual Disks
- Reconfiguring Or Migrating Virtual Disks
- Starting And Target RAID Levels For Virtual Disk Reconfiguration And Capacity Expansion
- Maintaining The Integrity Of Redundant Virtual Disks
- Rebuilding Redundant Information
- Managing Virtual Disk Bad Block Management
- Recommendations For Clearing Bad Blocks
- Virtual Disk Properties And Tasks
- Virtual Disk — Available Tasks
- Reconfiguring A Virtual Disk
- Format, Initialize, Slow, And Fast Initialize
- Canceling Background Initialization
- Restoring Dead Segments
- Deleting Data On the Virtual Disk
- Performing A Check Consistency
- Canceling A Check Consistency
- Pausing A Check Consistency
- Resuming A Check Consistency
- Blinking And Unblinking A Virtual Disk
- Renaming A Virtual Disk
- Canceling A Rebuild
- Changing The Virtual Disk Policy
- Replacing A Member Disk
- Clearing Virtual Disk Bad Blocks
- Encrypting A Virtual Disk
- Create Virtual Disk Express Wizard
- Create Virtual Disk Express Wizard (Step 2)
- Create Virtual Disk Advanced Wizard
- Create Virtual Disk Advanced Wizard (Step 2)
- Create Virtual Disk Advanced Wizard (Step 3)
- Span Edit
- Virtual Disk Task: Reconfigure (Step 1 of 3)
- Virtual Disk Task: Reconfigure (Step 2 of 3)
- Virtual Disk Task: Reconfigure (Step 3 of 3)
- Slow And Fast Initialize
- Formatting Or Initializing A Disk
- Deleting A Virtual Disk
- Renaming A Virtual Disk
- Changing The Policy Of A Virtual Disk
- Split Mirror
- Unmirror
- Assigning And Unassigning Dedicated Hot Spare
- Virtual Disk Task: Replace Member Disk (Step 1 of 2)
- Virtual Disk Task: Replace Member Disk (Step 2 of 2)
- Considerations Before Creating Virtual Disks
- Moving Physical And Virtual Disks From One System To Another
- Protecting Your Virtual Disk With A Hot Spare
- CacheCade Using Solid-State Drives
- Troubleshooting
- Common Troubleshooting Procedures
- Cables Attached Correctly
- System Requirements
- Drivers And Firmware
- Isolate Hardware Problems
- Rescan To Update Information On SCSI Controllers
- Replacing A Failed Disk
- Using The Physical Disk Online Command On Select Controllers
- Recovering From Removing The Wrong Physical Disk
- Resolving Microsoft Windows Upgrade Problems
- Virtual Disk Troubleshooting
- A Rebuild Does Not Work
- A Rebuild Completes With Errors
- Cannot Create A Virtual Disk
- A Virtual Disk Of Minimum Size Is Not Visible To Windows Disk Management
- Virtual Disk Errors On Systems Running Linux
- Problems Associated With Using The Same Physical Disks For Both Redundant And Non-Redundant Virtual Disks
- Specific Problem Situations And Solutions
- Physical Disk Is Offline Or Displays An Error Status
- Receive A Bad Block Alert With Replacement, Sense, Or Medium Error
- Alerts 2146 Through 2150 Received During A Rebuild Or While A Virtual Disk Is Degraded
- Alerts 2146 Through 2150 Received While Performing I/O, Consistency Check, Format, Or Other Operation
- Read And Write Operations Experience Problems
- A Task Menu Option Is Not Displayed
- A Corrupt Disk Or Drive Message Suggests Running Autocheck During A Reboot
- Erroneous Status And Error Messages After A Windows Hibernation
- Storage Management May Delay Before Updating Temperature Probe Status
- Storage Management May Delay Displaying Storage Devices After Reboot
- You Are Unable To Log Into A Remote System
- Cannot Connect To Remote System Running Microsoft Windows Server 2003
- Reconfiguring A Virtual Disk Displays Error In Mozilla Browser
- Physical Disks Are Displayed Under The Connector Object Instead Of The Enclosure Object
- PCIe SSD Troubleshooting
- Common Troubleshooting Procedures
- Frequently Asked Questions
- Why Is A Rebuild Not Working?
- How To Avoid Removing The Wrong Disk
- How Can I Safely Remove Or Replace A Physical Disk
- How Do I Recover From Removing The Wrong Physical Disk
- How Do I Identify The Firmware Version That Is Installed
- Which Controllers Do I Have?
- How Do I Turn Off An Alarm
- Which RAID Level Is Best For Me?
- Supported Features
- Supported Features On PERC 6/ Controllers
- Controller Tasks Supported On PERC 6/ Controllers
- Battery Tasks Supported On PERC 6/ Controllers
- Connector Tasks Supported By PERC 6/ Controllers
- Physical Disk Tasks Supported By PERC 6/ Controllers
- Virtual Disk Tasks Supported By PERC 6/ Controllers
- Virtual Disk Specifications For PERC 6/ Controllers
- RAID Levels Supported By PERC 6 Controllers
- Read, Write, And Cache Policy Supported By PERC 6 Controllers
- Enclosure Support On PERC 6/ Controllers
- Supported Features On PERC Hardware Controllers
- Controller Tasks Supported On PERC Hardware Controllers
- Battery Tasks Supported On PERC Hardware Controllers
- Connector Tasks Supported By PERC Hardware Controllers
- Physical Disk Tasks Supported By PERC Hardware Controllers
- Virtual Disk Tasks Supported By PERC Hardware Controllers
- Virtual Disk Specifications For PERC Hardware Controllers
- RAID Levels Supported By PERC Hardware Controllers
- Read, Write, Cache And Disk Cache Policy Supported By PERC Hardware Controllers
- Enclosure Support On PERC Hardware Controllers
- Supported Features On SAS 6iR And PERC H200 Controllers
- Controller Tasks Supported On SAS 6/iR And H200 Controllers
- Battery Tasks Supported On SAS 6/iR And H200 Controllers
- Connector Tasks Supported On SAS 6/iR And H200 Controllers
- Physical Disk Tasks Supported On SAS 6/iR And H200 Controllers
- Virtual Disk Tasks Supported By SAS 6/iR And H200 Controllers
- RAID Levels Supported By SAS 6/iR And H200 Controllers
- Virtual Disk Specifications For SAS 6/iR And PERC H200 Controllers
- Read, Write, And Cache Policy Supported By SAS 6/iR And H200 Controllers
- Enclosure Support On SAS 6/iR And H200 Controllers
- Supported Features On The PERC S100, PERC S110, PERC S130, And S300 Controllers
- Controller Tasks Supported On The PERC S100, PERC S110, PERC S130, And S300 Controllers
- Physical Disk Tasks Supported By The PERC S100, PERC S110, PERC S130, And S300 Controllers
- Virtual Disk Tasks Supported By The PERC S100, PERC S110, PERC S130, And S300 Controllers
- Virtual Disk Specifications For PERC S100, PERC S110, PERC S130, And S300 Controllers
- RAID Levels Supported By The PERC S100, PERC S110, PERC S130, And S300 Controllers
- Read Write Cache And Disk Cache Policy Supported By The PERC S100, PERC S110, PERC S130, And S300 Controllers
- Enclosure Support On The PERC S100, PERC S110, PERC S130, And S300 Controllers
- Supported Features On The Non-RAID Controllers
- Controller Tasks Supported On The Non-RAID Controllers
- Battery Tasks Supported By Non-RAID Controllers
- Connector Tasks Supported On The Non-RAID Controllers
- Physical Disk Tasks Supported On The Non-RAID Controllers
- Virtual Disk Tasks Supported By The Non-RAID Controllers
- Enclosure Support On The Non-RAID Controllers
- Enclosure And Backplane Features
- Maximum Supported Configuration For SAS Controllers
- Supported Features On PERC 6/ Controllers
- Determining The Health Status For Storage Components
- Health Status Rollup: Battery Is Charging Or Dead
- Health Status Rollup: Physical Disks In A Virtual Disk Are Failed Or Removed
- Health Status Rollup: Physical Disks In A Virtual Disk Are Unsupported, Partially, Or Permanently Degraded
- Health Status Rollup: All Physical Disks In A Virtual Disk Are In Foreign State
- Health Status Rollup: Some Physical Disks In A Virtual Disk Are In Foreign State
- Health Status Rollup: Virtual Disk Is Degraded; Physical Disks Are Failed Or Rebuilding
- Health Status Rollup: Virtual Disk Is Failed
- Health Status Rollup: Unsupported Firmware Version
- Health Status Rollup: Enclosure Power Supply Failed Or Power Connection Removed
- Health Status Rollup: One Enclosure Fan Is Failed
- Health Status Rollup: One Enclosure EMM Is Failed
- Health Status Rollup: One Enclosure Temperature Probe Is Failed
- Health Status Rollup: Lost Both Power Connections To The Enclosure
- Health Status Rollup: One Or More Physical Disks Are Failed
- Health Status Rollup: Physical Disk Is Rebuilding
Server Administrator Storage Management 8.3 User’s Guide
Read Policy
Does my controller support this feature? See Supported Features.
The read policies indicate whether the controller
should read sequential sectors of the virtual disk when seeking data.
- Read Ahead — The controller reads sequential sectors of the virtual disk when seeking data. Read ahead policy may improve system performance if the data is written to the sequential sectors of the virtual disk.
- No Read Ahead — Selecting no read ahead policy indicates that the controller should not use read ahead policy.
- Read Cache Enabled — The controller reads the cache information to verify if the requested data is available in the cache before retrieving the data from the disk. Reading the cache information first can provide faster read performance because the data (if available in the cache) can be retrieved more quickly from the cache than from the disk.
- Read Cache Disabled — The controller retrieves data directly from the disk and not from the cache.
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