RAID 1E Enhanced Mirror | Meridian Data guide

RAID 1E – Enhanced Mirror

RAID 1E offers the security of mirrored data provided by RAID 1 plus the added capacity of more than two disk drives. It also offers overall increased read/write performance plus the flexibility of using an odd number of disk drives. With RAID 1E, each data stripe is mirrored onto two disk drives. If one drive fails or has errors, the other drives continue to function, providing fault tolerance.

Enhanced Data Mirrors

Disk Driv es

Figure 23: RAID 1E, mirroring across an odd number of disk drives

The advantage of RAID 1E is the ability to use an odd number of disk drives, unlike RAID 1 and RAID 10. You can also create a RAID 1E Logical Drive with an even number of disk drives. However, if you have an even number of disks, you will obtain greater security with comparable performance using RAID 10.

RAID 1E arrays consist of three or more physical drives. You can create an array with just two physical drives and specify RAID 1E. But the resulting array will actually be a RAID 1.

Recommended applications: Imaging Applications, Database Servers, General Fileservers.

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Meridian Data manual RAID 1E Enhanced Mirror, Enhanced Data Mirrors Disk Driv es

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 Subsystem and Controller Features Operational FeaturesArchitectural Description 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 Logging into Astra GUI Regular ConnectionSecure Connection Http//192.168.10.85 Perusing the Interface Using the HeaderSelecting a Language Using Tree View Using Management ViewLogging out of Astra GUI Viewing the Event Frame Working with the Storage Network Working with Subsystems Setting an Alias for the Subsystem Setting Redundancy for the SubsystemSetting Subsystem Date and Time Viewing Subsystem Information Saving the Runtime Event Log Clearing the Runtime Event LogViewing Nvram Events Saving Nvram Events Making Background Activity Settings Clearing Nvram EventsViewing Current Background Activities Running Background Activities Running Media PatrolRunning PDM Viewing Scheduled Activities Setting the Lock Deleting a Scheduled ActivityViewing Lock Status Managing Users Renewing the LockReleasing the Lock Viewing User Information Making User Settings Modifying Your Own User SettingsSetting-up User Event Subscriptions Changing Another User’s Password Changing Your Own PasswordCreating a User List of User Privileges Modifying Subsystem Management Port Settings Managing the Network ConnectionDeleting a User 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 Port Setting Information Viewing Fibre Channel Port StatisticsViewing SFP Information Clearing Statistics Managing SAS Connections Viewing Fibre Channel Logged-in DevicesViewing Fibre Channel Initiators Adding an Initiator Modifying SAS Port Settings Viewing SAS Port StatisticsViewing SAS Initiators Managing Storage Services Adding an InitiatorDeleting an Initiator Viewing the LUN Map Managing Software Services Managing Email SettingsEnabling LUN Masking Adding a LUN Map Managing SLP Settings Managing Web Server Settings Managing Telnet SettingsStarting or Restarting SLP service Stopping Web Server service Managing Snmp Settings Stopping Telnet serviceStarting or Restarting Telnet service Adding Trap Sinks Managing CIM Settings Stopping Snmp serviceStarting or Restarting Snmp service Stopping CIM service Managing Netsend Settings Exporting the User Database Importing a User Database Restoring Factory Defaults Updating the FirmwareClearing Statistics Click the Clear Statistics link Shutting Down the Subsystem Restarting the SubsystemManaging Controllers Viewing the Controllers Adjustable items Locating a ControllerViewing Controller Information Modifying Controller Settings Viewing Controller StatisticsUpgradable items Managing Enclosures Clearing an Orphan WatermarkViewing the Enclosures Locating an Enclosure Modifying Enclosure Settings Viewing Enclosure InformationViewing FRU VPD Information Checking the Batteries Reconditioning a Battery Managing Buzzer SettingsTesting the Buzzer Battery Notes Modifying Global Physical Drive Settings Managing Physical DrivesViewing a List of 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 Managing Disk Arrays Viewing Disk ArraysCreating a Disk Array 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 Rebuilding a Disk Array Running Media Patrol on a Disk ArrayRunning PDM on a Disk Array Rebuilding Automatically Transitioning a Disk Array Preparing a Disk Array for Transport Managing Logical Drives Viewing Information for All Logical DrivesViewing Logical Drive Information Logical Drive Status Managing Logical Drive Settings Viewing Logical Drive StatisticsInitializing a Logical Drive Logical Drive Synchronization Running Redundancy Check Viewing the Logical Drive Check Table Managing Logical Drive LUN Settings Table DefinitionsLUN Mapping Parameters Managing Spare Drives Viewing a List of Spare DrivesLocating a Spare Drive Creating a Spare Drive Modifying Spare Drive Settings Deleting Spare Drive Securstor Astra ES Working with the Logical Drive Summary Running Spare CheckViewing a List of All Logical Drives Viewing Individual Logical Drive Information Maintenance Replacing a Power Supply Remove the Old Power SupplyInstall a New 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 Installing the new controller Replacing a RAID ControllerDual Controller Subsystem 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 Choosing Stripe Size Choosing Sector SizeTB Limitation Logical Drive Size Sector Size Cache Policy LUN AffinityRead Cache Policy Write Cache Policy Logical Drive Settings Capacity CoercionDisk Array Creation Failover and Failback Initialization Hot Spare DrivesPartition and Format the Logical Drive RAID Level Migration Increase Redundancy From CapacityAdd Lose Media Patrol 100 Predictive Data Migration PDM Transition101 PDM Triggers 102 Following is an example to explain the Transition function 103 Automatic TransitionManual Transition 104 Beep Tones LEDs Display105 Front Panel 106 Front of EnclosureState LEDs Steady Flashing Amber Red Green Drive Status Indicators Drive Status Indicators Back of Enclosure107 State LEDs Astra Web GUI Reports a Problem Error Dirty Cache108 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 111 Blowers EventsCache Events Reported Event Corrective Action Blowers 112 Controller EventsDisk Array Events Reported Event Corrective Action Controller 113 Drive Interface Controller EventsEnclosure Events Reported Event Corrective Action Drive Interface Controller 114 Event Log EventsFibre Channel 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 126 Redundancy Check EventsResource Events Reported Event Corrective Action Redundancy Check 127 Spare Check EventsSpare Drives Events Smart Events 128 Stripe Level Migration EventsReported Event Corrective Action Stripe Level Migration 129 Synchronization EventsSystem Events Reported Event Corrective Action Synchronization Critical & Offline Disk Arrays 130Transition Events Watermark Events When a Physical Drive Fails 131With a Hot Spare Drive Without a Hot Spare Drive Physical Drive Problems Incomplete Array132 Physical Drive Offline 133 Physical Drive FailedPhysical Drive Fails during Migration Physical Drive Fails during Transport Enclosure Problems 134Overheating Power Supplies 135 136 137 138 Installing a Second Controller 139Dual Controllers and Sata Drives