RAID 5 Block and Parity Stripe | Meridian Data 1 manual

RAID 5 – Block and Parity Stripe

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.

Distributed Parity

Data

Blocks

Disk Driv es

Figure 24: RAID 5, stripes all drives with data and parity information

The capacity of a RAID 5 disk array is the smallest drive size multiplied by the number of drives less one. Hence, a RAID 5 disk array with four 100 GB hard drives will have a capacity of 300 GB. A disk array with eight 120 GB hard drives and one 100 GB hard drive will have a capacity of 800 GB.

RAID 5 requires a minimum of three physical drives and a maximum of 16.

Recommended applications: File and Application Servers; WWW, E-mail, News servers, Intranet Servers

SECURSTOR ASTRA ES

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Meridian Data 1 manual RAID 5 Block and Parity Stripe, Distributed Parity Data Blocks Disk Driv es

Contents

Contact Information SecurStor Astra ES Copyright This page intentionally left blank Table of Contents 105 This page intentionally left blank About This Manual Introduction to Astra ES Astra ES FC Host rear view Astra ES Overview Operational Features Subsystem and Controller FeaturesArchitectural Description Highlights Management Specifications FCC Statement Warranty and SupportCE Statement This page intentionally left blank Unpacking the Astra ES Astra ES Installation Mounting Astra ES in a Rack Drive Slot Numbering Installing Disk DrivesMUX Adapter Configuring Direct Attached Storage Configuring a Storage Area NetworkMaking Management and Data Connections Configuring Jbod expansion Serial Attached Scsi Host Configuring Cascaded Storage Astra ES front panel LED display Connecting the Power Regular Connection Logging into Astra GUISecure Connection Http//192.168.10.85 Using the Header Perusing the InterfaceSelecting a Language Using Management View Using Tree ViewLogging out of Astra GUI Viewing the Event Frame Working with Subsystems Working with the Storage Network Setting Redundancy for the Subsystem Setting an Alias for the SubsystemSetting Subsystem Date and Time Viewing Subsystem Information Clearing the Runtime Event Log Saving the Runtime Event LogViewing Nvram Events Saving Nvram Events Clearing Nvram Events Making Background Activity SettingsViewing Current Background Activities Running Media Patrol Running Background ActivitiesRunning PDM Viewing Scheduled Activities Deleting a Scheduled Activity Setting the LockViewing Lock Status Renewing the Lock Managing UsersReleasing the Lock Viewing User Information Modifying Your Own User Settings Making User SettingsSetting-up User Event Subscriptions Changing Your Own Password Changing Another User’s PasswordCreating a User List of User Privileges Managing the Network Connection Modifying Subsystem Management Port SettingsDeleting a User Viewing User Sessions Managing Fibre Channel Connections Modifying Controller Management Port SettingsViewing Fibre Channel Node Information Modifying Fibre Channel Port Settings Viewing Fibre Channel Port Settings Viewing Fibre Channel Port Statistics Port Setting InformationViewing SFP Information Clearing Statistics Viewing Fibre Channel Logged-in Devices Managing SAS ConnectionsViewing Fibre Channel Initiators Adding an Initiator Viewing SAS Port Statistics Modifying SAS Port SettingsViewing SAS Initiators Adding an Initiator Managing Storage ServicesDeleting an Initiator Viewing the LUN Map Managing Email Settings Managing Software ServicesEnabling LUN Masking Adding a LUN Map Managing SLP Settings Managing Telnet Settings Managing Web Server SettingsStarting or Restarting SLP service Stopping Web Server service Stopping Telnet service Managing Snmp SettingsStarting or Restarting Telnet service Adding Trap Sinks Stopping Snmp service Managing CIM SettingsStarting or Restarting Snmp service Stopping CIM service Exporting the User Database Managing Netsend Settings Importing a User Database Updating the Firmware Restoring Factory DefaultsClearing Statistics Click the Clear Statistics link Restarting the Subsystem Shutting Down the SubsystemManaging Controllers Viewing the Controllers Locating a Controller Adjustable itemsViewing Controller Information Viewing Controller Statistics Modifying Controller SettingsUpgradable items Clearing an Orphan Watermark Managing EnclosuresViewing the Enclosures Locating an Enclosure Viewing Enclosure Information Modifying Enclosure SettingsViewing FRU VPD Information Checking the Batteries Managing Buzzer Settings Reconditioning a BatteryTesting the Buzzer Battery Notes Managing Physical Drives Modifying Global Physical Drive SettingsViewing a List of Physical Drives Identifying a Physical Drive Viewing Physical Drive Information Modifying Physical Drive SettingsViewing Physical Drive Statistics Forcing a Physical Drive Offline or Online Clearing Stale and PFA Conditions Viewing Disk Arrays Managing Disk ArraysCreating a Disk Array Creating a Disk Array Automatic Creating a Disk Array Advanced Creating a Disk Array Express Logical Drive Creation Disk Array CreationSummary Viewing Disk Array Information Deleting a Disk ArrayDisk Array Operational Status Creating a Logical Drive Managing Disk Array Settings Migrating a Disk Array Deleting a Logical Drive Running Media Patrol on a Disk Array Rebuilding a Disk ArrayRunning PDM on a Disk Array Rebuilding Automatically Preparing a Disk Array for Transport Transitioning a Disk Array Viewing Information for All Logical Drives Managing Logical DrivesViewing Logical Drive Information Logical Drive Status Viewing Logical Drive Statistics Managing Logical Drive SettingsInitializing a Logical Drive Logical Drive Synchronization Viewing the Logical Drive Check Table Running Redundancy Check Table Definitions Managing Logical Drive LUN SettingsLUN Mapping Parameters Viewing a List of Spare Drives Managing Spare DrivesLocating a Spare Drive Creating a Spare Drive Deleting Spare Drive Modifying Spare Drive Settings Securstor Astra ES Running Spare Check Working with the Logical Drive SummaryViewing a List of All Logical Drives Viewing Individual Logical Drive Information Maintenance Remove the Old Power Supply Replacing a Power SupplyInstall a New Power Supply Restarting the Subsystem Remove and Replace a Blower Replacing a Cooling Unit Blower Thumbscrews on blower Removing the cooling unit from enclosure Replacing a Cache Battery Replacing a RAID Controller Installing the new controllerDual Controller Subsystem Removing the old controller Replacing Astra ES controller Single Controller Subsystem This page intentionally left blank Introduction to RAID Technology Background RAID 0 Stripe Data Stripe Disk Driv es RAID 1 Mirror Data Mirror Disk Driv es Enhanced Data Mirrors Disk Driv es RAID 1E Enhanced Mirror Distributed Parity Data Blocks Disk Driv es RAID 5 Block and Parity Stripe RAID 6, stripes all drives with data and double parity RAID 6 Block and Double Parity Stripe RAID 10 Mirror + Stripe Data Stripe Mirror Disk Driv es RAID 50 Axles RAID 50 Striping of Distributed Parity RAID 50 Array No. of Drives No. of Axles Drives per Axle RAID 60 Axles RAID 60 Striping of Double Parity RAID 60 Array No. of Drives No. of Axles Drives per Axle Advantages Disadvantages Choosing a RAID Level RAID 1E RAID Choosing Sector Size Choosing Stripe SizeTB Limitation Logical Drive Size Sector Size LUN Affinity Cache PolicyRead Cache Policy Write Cache Policy Capacity Coercion Logical Drive SettingsDisk Array Creation Failover and Failback Hot Spare Drives InitializationPartition and Format the Logical Drive Increase Redundancy From Capacity RAID Level MigrationAdd Lose 100 Media Patrol Transition Predictive Data Migration PDM101 PDM Triggers Following is an example to explain the Transition function 102 Automatic Transition 103Manual Transition 104 LEDs Display Beep Tones105 Front Panel Front of Enclosure 106State LEDs Steady Flashing Amber Red Green Drive Status Indicators Back of Enclosure Drive Status Indicators107 State LEDs Error Dirty Cache Astra Web GUI Reports a Problem108 Controller LEDs Example of Yellow !’s and Red X’s in Tree View of Web GUI 109 Reported Event Corrective Action Battery Battery EventsEvent Notification Response Blowers Events 111Cache Events Reported Event Corrective Action Blowers Controller Events 112Disk Array Events Reported Event Corrective Action Controller Drive Interface Controller Events 113Enclosure Events Reported Event Corrective Action Drive Interface Controller Event Log Events 114Fibre Channel Events Reported Event Corrective Action Event Log Host Interface Controller Events 115Reported Event Corrective Action Host Interface Controller Logical Drive Events 116Reported Event Corrective Action Logical Drive Media Patrol Events 117Reported Event Corrective Action Media Patrol Online Capacity Expansion Events 118Reported Event Corrective Action Online Capacity Expansion PDM Events 119Reported Event Corrective Action Reported Event Corrective Action Physical Disk 120 Physical Disk Events 121 122 Reported Event Corrective Action PSU Power Supply UnitsPSU Events PSU Fans Events 123Reported Event Corrective Action PSU Fans RAID Level Migration Events 124Reported Event Corrective Action RAID Level Migration Rebuild Events 125Reported Event Corrective Action Rebuild Redundancy Check Events 126Resource Events Reported Event Corrective Action Redundancy Check Spare Check Events 127Spare Drives Events Smart Events Stripe Level Migration Events 128Reported Event Corrective Action Stripe Level Migration Synchronization Events 129System Events Reported Event Corrective Action Synchronization 130 Critical & Offline Disk ArraysTransition Events Watermark Events 131 When a Physical Drive FailsWith a Hot Spare Drive Without a Hot Spare Drive Incomplete Array Physical Drive Problems132 Physical Drive Offline Physical Drive Failed 133Physical Drive Fails during Migration Physical Drive Fails during Transport 134 Enclosure ProblemsOverheating 135 Power Supplies 136 137 138 139 Installing a Second ControllerDual Controllers and Sata Drives