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

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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 ESCopyright This page intentionally left blank Table of Contents 105 This page intentionally left blank About This Manual Introduction to Astra ESAstra ES FC Host rear view Astra ES OverviewOperational Features Subsystem and Controller FeaturesArchitectural Description HighlightsManagement SpecificationsFCC Statement Warranty and SupportCE Statement This page intentionally left blank Unpacking the Astra ES Astra ES InstallationMounting 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 PowerRegular Connection Logging into Astra GUISecure Connection Http//192.168.10.85Using the Header Perusing the InterfaceSelecting a Language Using Management View Using Tree ViewLogging out of Astra GUI Viewing the Event FrameWorking with Subsystems Working with the Storage NetworkSetting Redundancy for the Subsystem Setting an Alias for the SubsystemSetting Subsystem Date and Time Viewing Subsystem InformationClearing the Runtime Event Log Saving the Runtime Event LogViewing Nvram Events Saving Nvram EventsClearing Nvram Events Making Background Activity SettingsViewing Current Background Activities Running Media Patrol Running Background ActivitiesRunning PDM Viewing Scheduled ActivitiesDeleting a Scheduled Activity Setting the LockViewing Lock Status Renewing the Lock Managing UsersReleasing the Lock Viewing User InformationModifying 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 PrivilegesManaging the Network Connection Modifying Subsystem Management Port SettingsDeleting a User Viewing User SessionsManaging Fibre Channel Connections Modifying Controller Management Port SettingsViewing Fibre Channel Node Information Modifying Fibre Channel Port Settings Viewing Fibre Channel Port SettingsViewing Fibre Channel Port Statistics Port Setting InformationViewing SFP Information Clearing StatisticsViewing Fibre Channel Logged-in Devices Managing SAS ConnectionsViewing Fibre Channel Initiators Adding an InitiatorViewing SAS Port Statistics Modifying SAS Port SettingsViewing SAS Initiators Adding an Initiator Managing Storage ServicesDeleting an Initiator Viewing the LUN MapManaging Email Settings Managing Software ServicesEnabling LUN Masking Adding a LUN MapManaging SLP Settings Managing Telnet Settings Managing Web Server SettingsStarting or Restarting SLP service Stopping Web Server serviceStopping Telnet service Managing Snmp SettingsStarting or Restarting Telnet service Adding Trap SinksStopping Snmp service Managing CIM SettingsStarting or Restarting Snmp service Stopping CIM serviceExporting the User Database Managing Netsend SettingsImporting a User Database Updating the Firmware Restoring Factory DefaultsClearing Statistics Click the Clear Statistics linkRestarting the Subsystem Shutting Down the SubsystemManaging Controllers Viewing the ControllersLocating a Controller Adjustable itemsViewing Controller Information Viewing Controller Statistics Modifying Controller SettingsUpgradable items Clearing an Orphan Watermark Managing EnclosuresViewing the Enclosures Locating an EnclosureViewing Enclosure Information Modifying Enclosure SettingsViewing FRU VPD Information Checking the BatteriesManaging Buzzer Settings Reconditioning a BatteryTesting the Buzzer Battery NotesManaging Physical Drives Modifying Global Physical Drive SettingsViewing a List of Physical Drives Identifying a Physical DriveViewing Physical Drive Information Modifying Physical Drive SettingsViewing Physical Drive Statistics Forcing a Physical Drive Offline or Online Clearing Stale and PFA ConditionsViewing Disk Arrays Managing Disk ArraysCreating a Disk Array Creating a Disk Array AutomaticCreating a Disk Array Advanced Creating a Disk Array ExpressLogical Drive Creation Disk Array CreationSummary Viewing Disk Array Information Deleting a Disk ArrayDisk Array Operational Status Creating a Logical Drive Managing Disk Array SettingsMigrating a Disk Array Deleting a Logical DriveRunning Media Patrol on a Disk Array Rebuilding a Disk ArrayRunning PDM on a Disk Array Rebuilding AutomaticallyPreparing a Disk Array for Transport Transitioning a Disk ArrayViewing Information for All Logical Drives Managing Logical DrivesViewing Logical Drive Information Logical Drive StatusViewing Logical Drive Statistics Managing Logical Drive SettingsInitializing a Logical Drive Logical Drive SynchronizationViewing the Logical Drive Check Table Running Redundancy CheckTable Definitions Managing Logical Drive LUN SettingsLUN Mapping Parameters Viewing a List of Spare Drives Managing Spare DrivesLocating a Spare Drive Creating a Spare DriveDeleting Spare Drive Modifying Spare Drive SettingsSecurstor Astra ES Running Spare Check Working with the Logical Drive SummaryViewing a List of All Logical Drives Viewing Individual Logical Drive InformationMaintenance Remove the Old Power Supply Replacing a Power SupplyInstall a New Power Supply Restarting the SubsystemRemove and Replace a Blower Replacing a Cooling Unit BlowerThumbscrews on blower Removing the cooling unit from enclosure Replacing a Cache BatteryReplacing a RAID Controller Installing the new controllerDual Controller Subsystem Removing the old controllerReplacing Astra ES controller Single Controller SubsystemThis page intentionally left blank Introduction to RAID Technology BackgroundRAID 0 Stripe Data Stripe Disk Driv esRAID 1 Mirror Data Mirror Disk Driv esEnhanced Data Mirrors Disk Driv es RAID 1E Enhanced MirrorDistributed Parity Data Blocks Disk Driv es RAID 5 Block and Parity StripeRAID 6, stripes all drives with data and double parity RAID 6 Block and Double Parity StripeRAID 10 Mirror + Stripe Data Stripe Mirror Disk Driv esRAID 50 Axles RAID 50 Striping of Distributed ParityRAID 50 Array No. of Drives No. of Axles Drives per Axle RAID 60 Axles RAID 60 Striping of Double ParityRAID 60 Array No. of Drives No. of Axles Drives per Axle Advantages Disadvantages Choosing a RAID LevelRAID 1E RAID Choosing Sector Size Choosing Stripe SizeTB Limitation Logical Drive Size Sector SizeLUN Affinity Cache PolicyRead Cache Policy Write Cache PolicyCapacity Coercion Logical Drive SettingsDisk Array Creation Failover and FailbackHot Spare Drives InitializationPartition and Format the Logical Drive Increase Redundancy From Capacity RAID Level MigrationAdd Lose 100 Media PatrolTransition Predictive Data Migration PDM101 PDM TriggersFollowing is an example to explain the Transition function 102Automatic Transition 103Manual Transition 104 LEDs Display Beep Tones105 Front PanelFront of Enclosure 106State LEDs Steady Flashing Amber Red GreenDrive Status Indicators Back of Enclosure Drive Status Indicators107 State LEDsError Dirty Cache Astra Web GUI Reports a Problem108 Controller LEDsExample of Yellow !’s and Red X’s in Tree View of Web GUI 109Reported Event Corrective Action Battery Battery EventsEvent Notification Response Blowers Events 111Cache Events Reported Event Corrective Action BlowersController Events 112Disk Array Events Reported Event Corrective Action ControllerDrive Interface Controller Events 113Enclosure Events Reported Event Corrective Action Drive Interface ControllerEvent Log Events 114Fibre Channel Events Reported Event Corrective Action Event LogHost 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 120Physical Disk Events 121122 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 CheckSpare Check Events 127Spare Drives Events Smart EventsStripe Level Migration Events 128Reported Event Corrective Action Stripe Level Migration Synchronization Events 129System Events Reported Event Corrective Action Synchronization130 Critical & Offline Disk ArraysTransition Events Watermark Events131 When a Physical Drive FailsWith a Hot Spare Drive Without a Hot Spare DriveIncomplete Array Physical Drive Problems132 Physical Drive OfflinePhysical Drive Failed 133Physical Drive Fails during Migration Physical Drive Fails during Transport134 Enclosure ProblemsOverheating 135 Power Supplies136 137 138 139 Installing a Second ControllerDual Controllers and Sata Drives