RAID 6 Block and Double Parity Stripe | Meridian Data 1 instruction

RAID 6 – Block and Double Parity Stripe

RAID level 6 stores dual parity data is rotated across the physical drives along with the block data. A RAID 6 disk array can continue to accept I/O requests when any two physical drives fail.

Double Distributed (Wide-space Q+Q) Parity

Data

Blocks

phy sical driv es

Figure 25: RAID 6, stripes all drives with data and double parity

The total capacity of a RAID 6 disk array is the smallest physical drive times the number of physical drives, minus two.

Hence, a RAID 6 disk array with six 100 GB hard drives will have a capacity of 400 GB. A disk logical drive with four100 GB hard drives will have a capacity of 200 GB.

RAID 6 becomes more capacity efficient in terms of physical drives as the number of physical drives increases.

RAID 6 offers double fault tolerance. Your logical drive remains available when up to two physical drives fail.

RAID 6 is generally considered to be the safest RAID level, except for RAID 60.

RAID 6 requires a minimum of four physical drives and a maximum of 16.

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

86	EXCEL MERIDIAN DATA

Image 86

Meridian Data 1 manual RAID 6 Block and Double Parity Stripe, RAID 6, stripes all drives with data and double parity

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 CE Statement Warranty and SupportFCC Statement This page intentionally left blank Astra ES Installation Unpacking the Astra ES Mounting Astra ES in a Rack MUX Adapter Installing Disk DrivesDrive Slot Numbering Making Management and Data Connections Configuring a Storage Area NetworkConfiguring Direct Attached Storage 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 Selecting a Language Perusing the InterfaceUsing the Header 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 Viewing Current Background Activities Making Background Activity SettingsClearing Nvram Events Running PDM Running Background ActivitiesRunning Media Patrol Viewing Scheduled Activities Viewing Lock Status Setting the LockDeleting a Scheduled Activity Releasing the Lock Managing UsersRenewing the Lock Viewing User Information Setting-up User Event Subscriptions Making User SettingsModifying Your Own User Settings 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 Viewing Fibre Channel Node Information Modifying Controller Management Port SettingsManaging Fibre Channel Connections 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 Viewing SAS Initiators Modifying SAS Port SettingsViewing SAS Port Statistics 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 Viewing Controller Information Adjustable itemsLocating a Controller Upgradable items Modifying Controller SettingsViewing Controller Statistics 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 Viewing Physical Drive Statistics Modifying Physical Drive SettingsViewing Physical Drive Information 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 Summary Disk Array CreationLogical Drive Creation Disk Array Operational Status Deleting a Disk ArrayViewing Disk Array Information 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 LUN Mapping Parameters Managing Logical Drive LUN SettingsTable Definitions 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 Partition and Format the Logical Drive InitializationHot Spare Drives Add Lose RAID Level MigrationIncrease Redundancy From Capacity Media Patrol 100 101 Predictive Data Migration PDMTransition PDM Triggers 102 Following is an example to explain the Transition function Manual Transition 103Automatic 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 Event Notification Response Battery EventsReported Event Corrective Action Battery 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 Reported Event Corrective Action Host Interface Controller 115Host Interface Controller Events Reported Event Corrective Action Logical Drive 116Logical Drive Events Reported Event Corrective Action Media Patrol 117Media Patrol Events Reported Event Corrective Action Online Capacity Expansion 118Online Capacity Expansion Events Reported Event Corrective Action 119PDM Events 120 Reported Event Corrective Action Physical Disk 121 Physical Disk Events PSU Events Reported Event Corrective Action PSU Power Supply Units122 Reported Event Corrective Action PSU Fans 123PSU Fans Events Reported Event Corrective Action RAID Level Migration 124RAID Level Migration Events Reported Event Corrective Action Rebuild 125Rebuild Events Resource Events 126Redundancy Check Events Reported Event Corrective Action Redundancy Check Spare Drives Events 127Spare Check Events Smart Events Reported Event Corrective Action Stripe Level Migration 128Stripe Level Migration Events 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 Overheating Enclosure Problems134 Power Supplies 135 136 137 138 Dual Controllers and Sata Drives Installing a Second Controller139