Data Stripe Mirror Disk Driv es | Meridian Data 1 specification

RAID 10 – Mirror + Stripe

Mirroring/striping combines both of the previous RAID 1 and RAID 0 disk array types. RAID 10 is similar though not identical to RAID 0+1. RAID 10 can increase performance by reading and writing data in parallel while protecting data with duplication. At least four drives are needed for RAID 10 to be installed. With four disk drives, the drive pairs are striped together with one pair mirroring the first pair. The data capacity is similar to a RAID 1 disk array, with half of the total storage capacity used for redundancy. An added plus for using RAID 10 is that, in many situations, such a disk array offers double fault tolerance. Double fault tolerance may allow your logical drive to continue to operate depending on which two disk drives fail.

Data Stripe

Data

Mirror

Disk Driv es

Figure 26: RAID 10, takes a data mirror on one drive pair and stripes it to over two other drive pairs

RAID 10 arrays require an even number of physical drives and a minimum of four. For RAID 10 characteristics with an odd number of disk drives, use RAID 1E. Recommended applications: Imaging Applications, Database Servers, General Fileservers.

SECURSTOR ASTRA ES

87

Image 87

Meridian Data manual Data Stripe Mirror Disk Driv es, RAID 10 Mirror + Stripe

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 Highlights Subsystem and Controller FeaturesOperational Features Architectural Description Management Specifications Warranty and Support FCC StatementCE Statement This page intentionally left blank Unpacking the Astra ES Astra ES Installation 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 Astra ES front panel LED display Connecting the Power Http//192.168.10.85 Logging into Astra GUIRegular Connection Secure Connection Perusing the Interface Using the HeaderSelecting a Language Viewing the Event Frame Using Tree ViewUsing Management View Logging out of Astra GUI Working with Subsystems Working with the Storage Network Viewing Subsystem Information Setting an Alias for the SubsystemSetting Redundancy for the Subsystem Setting Subsystem Date and Time Saving Nvram Events Saving the Runtime Event LogClearing the Runtime Event Log Viewing Nvram Events Making Background Activity Settings Clearing Nvram EventsViewing Current Background Activities Viewing Scheduled Activities Running Background ActivitiesRunning Media Patrol Running PDM Setting the Lock Deleting a Scheduled ActivityViewing Lock Status Viewing User Information Managing UsersRenewing the Lock Releasing the Lock Making User Settings Modifying Your Own User SettingsSetting-up User Event Subscriptions List of User Privileges Changing Another User’s PasswordChanging Your Own Password Creating a User Viewing User Sessions Modifying Subsystem Management Port SettingsManaging the Network Connection Deleting a User Modifying Controller Management Port Settings Managing Fibre Channel ConnectionsViewing Fibre Channel Node Information Modifying Fibre Channel Port Settings Viewing Fibre Channel Port Settings Clearing Statistics Port Setting InformationViewing Fibre Channel Port Statistics Viewing SFP Information Adding an Initiator Managing SAS ConnectionsViewing Fibre Channel Logged-in Devices Viewing Fibre Channel Initiators Modifying SAS Port Settings Viewing SAS Port StatisticsViewing SAS Initiators Viewing the LUN Map Managing Storage ServicesAdding an Initiator Deleting an Initiator Adding a LUN Map Managing Software ServicesManaging Email Settings Enabling LUN Masking Managing SLP Settings Stopping Web Server service Managing Web Server SettingsManaging Telnet Settings Starting or Restarting SLP service Adding Trap Sinks Managing Snmp SettingsStopping Telnet service Starting or Restarting Telnet service Stopping CIM service Managing CIM SettingsStopping Snmp service Starting or Restarting Snmp service Exporting the User Database Managing Netsend Settings Importing a User Database Click the Clear Statistics link Restoring Factory DefaultsUpdating the Firmware Clearing Statistics Viewing the Controllers Shutting Down the SubsystemRestarting the Subsystem Managing Controllers Adjustable items Locating a ControllerViewing Controller Information Modifying Controller Settings Viewing Controller StatisticsUpgradable items Locating an Enclosure Managing EnclosuresClearing an Orphan Watermark Viewing the Enclosures Checking the Batteries Modifying Enclosure SettingsViewing Enclosure Information Viewing FRU VPD Information Battery Notes Reconditioning a BatteryManaging Buzzer Settings Testing the Buzzer Identifying a Physical Drive Modifying Global Physical Drive SettingsManaging Physical Drives Viewing a List of Physical Drives Modifying Physical Drive Settings Viewing Physical Drive InformationViewing Physical Drive Statistics Forcing a Physical Drive Offline or Online Clearing Stale and PFA Conditions Creating a Disk Array Automatic Managing Disk ArraysViewing Disk Arrays Creating a Disk Array Creating a Disk Array Advanced Creating a Disk Array Express Disk Array Creation Logical Drive CreationSummary Deleting a Disk Array Viewing Disk Array InformationDisk Array Operational Status Creating a Logical Drive Managing Disk Array Settings Migrating a Disk Array Deleting a Logical Drive Rebuilding Automatically Rebuilding a Disk ArrayRunning Media Patrol on a Disk Array Running PDM on a Disk Array Preparing a Disk Array for Transport Transitioning a Disk Array Logical Drive Status Managing Logical DrivesViewing Information for All Logical Drives Viewing Logical Drive Information Logical Drive Synchronization Managing Logical Drive SettingsViewing Logical Drive Statistics Initializing a Logical Drive Viewing the Logical Drive Check Table Running Redundancy Check Managing Logical Drive LUN Settings Table DefinitionsLUN Mapping Parameters Creating a Spare Drive Managing Spare DrivesViewing a List of Spare Drives Locating a Spare Drive Deleting Spare Drive Modifying Spare Drive Settings Securstor Astra ES Viewing Individual Logical Drive Information Working with the Logical Drive SummaryRunning Spare Check Viewing a List of All Logical Drives Maintenance Restarting the Subsystem Replacing a Power SupplyRemove the Old Power Supply Install a New Power Supply Remove and Replace a Blower Replacing a Cooling Unit Blower Thumbscrews on blower Removing the cooling unit from enclosure Replacing a Cache Battery Removing the old controller Installing the new controllerReplacing a RAID Controller Dual Controller Subsystem 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 Logical Drive Size Sector Size Choosing Stripe SizeChoosing Sector Size TB Limitation Write Cache Policy Cache PolicyLUN Affinity Read Cache Policy Failover and Failback Logical Drive SettingsCapacity Coercion Disk Array Creation Initialization Hot Spare DrivesPartition and Format the Logical Drive RAID Level Migration Increase Redundancy From CapacityAdd Lose 100 Media Patrol PDM Triggers Predictive Data Migration PDMTransition 101 Following is an example to explain the Transition function 102 103 Automatic TransitionManual Transition 104 Front Panel Beep TonesLEDs Display 105 Steady Flashing Amber Red Green 106Front of Enclosure State LEDs State LEDs Drive Status IndicatorsDrive Status Indicators Back of Enclosure 107 Controller LEDs Astra Web GUI Reports a ProblemError Dirty Cache 108 Example of Yellow !’s and Red X’s in Tree View of Web GUI 109 Battery Events Reported Event Corrective Action BatteryEvent Notification Response Reported Event Corrective Action Blowers 111Blowers Events Cache Events Reported Event Corrective Action Controller 112Controller Events Disk Array Events Reported Event Corrective Action Drive Interface Controller 113Drive Interface Controller Events Enclosure Events Reported Event Corrective Action Event Log 114Event Log Events Fibre Channel Events 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 Reported Event Corrective Action Physical Disk 120 Physical Disk Events 121 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 Reported Event Corrective Action Redundancy Check 126Redundancy Check Events Resource Events Smart Events 127Spare Check Events Spare Drives Events 128 Stripe Level Migration EventsReported Event Corrective Action Stripe Level Migration Reported Event Corrective Action Synchronization 129Synchronization Events System Events Watermark Events Critical & Offline Disk Arrays130 Transition Events Without a Hot Spare Drive When a Physical Drive Fails131 With a Hot Spare Drive Physical Drive Offline Physical Drive ProblemsIncomplete Array 132 Physical Drive Fails during Transport 133Physical Drive Failed Physical Drive Fails during Migration Enclosure Problems 134Overheating 135 Power Supplies 136 137 138 Installing a Second Controller 139Dual Controllers and Sata Drives