RAID 60 Striping of Double Parity, RAID 60 Axles | Meridian Data 1

RAID 60 – Striping of Double Parity

RAID 60 combines both RAID 6 and RAID 0 features. Data is striped across disks as in RAID 0, and it uses double distributed parity as in RAID 6. RAID 60 provides data reliability, good overall performance and supports larger volume sizes.

Data Stripes

Double Distributed Parity

Axle 1

Axle 2

Disk Driv es

Figure 28: RAID 60, striping of double distributed parity disk arrays

RAID 60 also provides very high reliability because data is still available even if multiple disk drives fail (two in each axle). The greater the number of axles, the greater the number of disk drives that can fail without the RAID 60 array going offline.

RAID 60 arrays consist of eight or more physical drives.

Using an Astra ES subsystem expanded by four Astra ES JBOD subsystems, your RAID 60 array supports up to 60 physical drives. However, you should set aside a few physical drives as hot spares.

Recommended applications: Accounting, financial, and database servers; any application requiring very high availability.

RAID 60 Axles

When you create a RAID 60, you must specify the number of axles. An axle refers to a single RAID 6 array that is striped with other RAID 6 arrays to make RAID 60. An axle can have from 4 to 16 physical drives, depending on the number of physical drives in the array.

The chart below shows RAID 60 arrays with 8 to 20 physical drives, the available number of axles, and the resulting distribution of physical drives on each axle.

90	EXCEL MERIDIAN DATA

Image 90

Meridian Data 1 manual RAID 60 Striping of Double Parity, RAID 60 Axles

Contents

SecurStor Astra ES Contact Information Copyright This page intentionally left blank Table of Contents 105 This page intentionally left blank Introduction to Astra ES About This Manual Astra ES Overview Astra ES FC Host rear view Architectural Description Subsystem and Controller FeaturesOperational Features Highlights Specifications Management Warranty and Support FCC StatementCE Statement This page intentionally left blank Astra ES Installation Unpacking the Astra ES Mounting Astra ES in a Rack Installing Disk Drives Drive Slot NumberingMUX Adapter Configuring a Storage Area Network Configuring Direct Attached StorageMaking Management and Data Connections Configuring Jbod expansion Serial Attached Scsi Host Configuring Cascaded Storage Connecting the Power Astra ES front panel LED display Secure Connection Logging into Astra GUIRegular Connection Http//192.168.10.85 Perusing the Interface Using the HeaderSelecting a Language Logging out of Astra GUI Using Tree ViewUsing Management View Viewing the Event Frame Working with the Storage Network Working with Subsystems Setting Subsystem Date and Time Setting an Alias for the SubsystemSetting Redundancy for the Subsystem Viewing Subsystem Information Viewing Nvram Events Saving the Runtime Event LogClearing the Runtime Event Log Saving Nvram Events Making Background Activity Settings Clearing Nvram EventsViewing Current Background Activities Running PDM Running Background ActivitiesRunning Media Patrol Viewing Scheduled Activities Setting the Lock Deleting a Scheduled ActivityViewing Lock Status Releasing the Lock Managing UsersRenewing the Lock Viewing User Information Making User Settings Modifying Your Own User SettingsSetting-up User Event Subscriptions Creating a User Changing Another User’s PasswordChanging Your Own Password List of User Privileges Deleting a User Modifying Subsystem Management Port SettingsManaging the Network Connection Viewing User Sessions Modifying Controller Management Port Settings Managing Fibre Channel ConnectionsViewing Fibre Channel Node Information Viewing Fibre Channel Port Settings Modifying Fibre Channel Port Settings Viewing SFP Information Port Setting InformationViewing Fibre Channel Port Statistics Clearing Statistics Viewing Fibre Channel Initiators Managing SAS ConnectionsViewing Fibre Channel Logged-in Devices Adding an Initiator Modifying SAS Port Settings Viewing SAS Port StatisticsViewing SAS Initiators Deleting an Initiator Managing Storage ServicesAdding an Initiator Viewing the LUN Map Enabling LUN Masking Managing Software ServicesManaging Email Settings Adding a LUN Map Managing SLP Settings Starting or Restarting SLP service Managing Web Server SettingsManaging Telnet Settings Stopping Web Server service Starting or Restarting Telnet service Managing Snmp SettingsStopping Telnet service Adding Trap Sinks Starting or Restarting Snmp service Managing CIM SettingsStopping Snmp service Stopping CIM service Managing Netsend Settings Exporting the User Database Importing a User Database Clearing Statistics Restoring Factory DefaultsUpdating the Firmware Click the Clear Statistics link Managing Controllers Shutting Down the SubsystemRestarting the Subsystem Viewing the Controllers Adjustable items Locating a ControllerViewing Controller Information Modifying Controller Settings Viewing Controller StatisticsUpgradable items Viewing the Enclosures Managing EnclosuresClearing an Orphan Watermark Locating an Enclosure Viewing FRU VPD Information Modifying Enclosure SettingsViewing Enclosure Information Checking the Batteries Testing the Buzzer Reconditioning a BatteryManaging Buzzer Settings Battery Notes Viewing a List of Physical Drives Modifying Global Physical Drive SettingsManaging Physical Drives Identifying a Physical Drive Modifying Physical Drive Settings Viewing Physical Drive InformationViewing Physical Drive Statistics Clearing Stale and PFA Conditions Forcing a Physical Drive Offline or Online Creating a Disk Array Managing Disk ArraysViewing Disk Arrays Creating a Disk Array Automatic Creating a Disk Array Express Creating a Disk Array Advanced Disk Array Creation Logical Drive CreationSummary Deleting a Disk Array Viewing Disk Array InformationDisk Array Operational Status Managing Disk Array Settings Creating a Logical Drive Deleting a Logical Drive Migrating a Disk Array Running PDM on a Disk Array Rebuilding a Disk ArrayRunning Media Patrol on a Disk Array Rebuilding Automatically Transitioning a Disk Array Preparing a Disk Array for Transport Viewing Logical Drive Information Managing Logical DrivesViewing Information for All Logical Drives Logical Drive Status Initializing a Logical Drive Managing Logical Drive SettingsViewing Logical Drive Statistics Logical Drive Synchronization Running Redundancy Check Viewing the Logical Drive Check Table Managing Logical Drive LUN Settings Table DefinitionsLUN Mapping Parameters Locating a Spare Drive Managing Spare DrivesViewing a List of Spare Drives Creating a Spare Drive Modifying Spare Drive Settings Deleting Spare Drive Securstor Astra ES Viewing a List of All Logical Drives Working with the Logical Drive SummaryRunning Spare Check Viewing Individual Logical Drive Information Maintenance Install a New Power Supply Replacing a Power SupplyRemove the Old Power Supply Restarting the Subsystem Replacing a Cooling Unit Blower Remove and Replace a Blower Thumbscrews on blower Replacing a Cache Battery Removing the cooling unit from enclosure Dual Controller Subsystem Installing the new controllerReplacing a RAID Controller Removing the old controller Single Controller Subsystem Replacing Astra ES controller This page intentionally left blank Technology Background Introduction to RAID Data Stripe Disk Driv es RAID 0 Stripe Data Mirror Disk Driv es RAID 1 Mirror RAID 1E Enhanced Mirror Enhanced Data Mirrors Disk Driv es RAID 5 Block and Parity Stripe Distributed Parity Data Blocks Disk Driv es RAID 6 Block and Double Parity Stripe RAID 6, stripes all drives with data and double parity Data Stripe Mirror Disk Driv es RAID 10 Mirror + Stripe RAID 50 Striping of Distributed Parity RAID 50 Axles RAID 50 Array No. of Drives No. of Axles Drives per Axle RAID 60 Striping of Double Parity RAID 60 Axles RAID 60 Array No. of Drives No. of Axles Drives per Axle Choosing a RAID Level Advantages Disadvantages RAID 1E RAID TB Limitation Choosing Stripe SizeChoosing Sector Size Logical Drive Size Sector Size Read Cache Policy Cache PolicyLUN Affinity Write Cache Policy Disk Array Creation Logical Drive SettingsCapacity Coercion Failover and Failback Initialization Hot Spare DrivesPartition and Format the Logical Drive RAID Level Migration Increase Redundancy From CapacityAdd Lose Media Patrol 100 101 Predictive Data Migration PDMTransition PDM Triggers 102 Following is an example to explain the Transition function 103 Automatic TransitionManual Transition 104 105 Beep TonesLEDs Display Front Panel State LEDs 106Front of Enclosure Steady Flashing Amber Red Green 107 Drive Status IndicatorsDrive Status Indicators Back of Enclosure State LEDs 108 Astra Web GUI Reports a ProblemError Dirty Cache Controller LEDs 109 Example of Yellow !’s and Red X’s in Tree View of Web GUI Battery Events Reported Event Corrective Action BatteryEvent Notification Response Cache Events 111Blowers Events Reported Event Corrective Action Blowers Disk Array Events 112Controller Events Reported Event Corrective Action Controller Enclosure Events 113Drive Interface Controller Events Reported Event Corrective Action Drive Interface Controller Fibre Channel Events 114Event Log Events Reported Event Corrective Action Event Log 115 Host Interface Controller EventsReported Event Corrective Action Host Interface Controller 116 Logical Drive EventsReported Event Corrective Action Logical Drive 117 Media Patrol EventsReported Event Corrective Action Media Patrol 118 Online Capacity Expansion EventsReported Event Corrective Action Online Capacity Expansion 119 PDM EventsReported Event Corrective Action 120 Reported Event Corrective Action Physical Disk 121 Physical Disk Events Reported Event Corrective Action PSU Power Supply Units 122PSU Events 123 PSU Fans EventsReported Event Corrective Action PSU Fans 124 RAID Level Migration EventsReported Event Corrective Action RAID Level Migration 125 Rebuild EventsReported Event Corrective Action Rebuild Resource Events 126Redundancy Check Events Reported Event Corrective Action Redundancy Check Spare Drives Events 127Spare Check Events Smart Events 128 Stripe Level Migration EventsReported Event Corrective Action Stripe Level Migration System Events 129Synchronization Events Reported Event Corrective Action Synchronization Transition Events Critical & Offline Disk Arrays130 Watermark Events With a Hot Spare Drive When a Physical Drive Fails131 Without a Hot Spare Drive 132 Physical Drive ProblemsIncomplete Array Physical Drive Offline Physical Drive Fails during Migration 133Physical Drive Failed Physical Drive Fails during Transport Enclosure Problems 134Overheating Power Supplies 135 136 137 138 Installing a Second Controller 139Dual Controllers and Sata Drives