RAID 50 Striping of Distributed Parity | Meridian Data 1 specs

RAID 50 – Striping of Distributed Parity

RAID 50 combines both RAID 5 and RAID 0 features. Data is striped across disks as in RAID 0, and it uses distributed parity as in RAID 5. RAID 50 provides data reliability, good overall performance and supports larger volume sizes.

Data Stripes

Distributed Parity

Axle 1

Axle 2

Disk Driv es

Figure 27: RAID 50, striping of distributed parity disk arrays

RAID 50 also provides high reliability because data is still available even if multiple disk drives fail (one in each axle). The greater the number of axles, the greater the number of disk drives that can fail without the RAID 50 array going offline.

RAID 50 arrays consist of six or more physical drives.

Using an Astra ES subsystem expanded by four Astra ES JBOD subsystems, your RAID 50 array supports up to 60 physical drives. However, you should set aside a few physical drives as hot spares.

Recommended applications: File and Application Servers, Transaction Processing, Office applications with many users accessing small files.

RAID 50 Axles

When you create a RAID 50, you must specify the number of axles. An axle refers to a single RAID 5 array that is striped with other RAID 5 arrays to make RAID 50. An axle can have from 3 to 16 physical drives, depending on the number of physical drives in the array.

The chart below shows RAID 50 arrays with 6 to 16 physical drives, the available number of axles, and the resulting distribution of physical drives on each axle.

88	EXCEL MERIDIAN DATA

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Meridian Data 1 manual RAID 50 Striping of Distributed Parity, RAID 50 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 Subsystem and Controller Features Operational FeaturesArchitectural Description Highlights Specifications Management FCC Statement Warranty and SupportCE Statement This page intentionally left blank Astra ES Installation Unpacking the Astra ES Mounting 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 Connecting the Power Astra ES front panel LED display Logging into Astra GUI Regular ConnectionSecure Connection Http//192.168.10.85 Using the Header Perusing the InterfaceSelecting 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 Clearing Nvram Events Making Background Activity SettingsViewing Current Background Activities Running Background Activities Running Media PatrolRunning PDM Viewing Scheduled Activities Deleting a Scheduled Activity Setting the LockViewing Lock Status Managing Users Renewing the LockReleasing the Lock Viewing User Information Modifying Your Own User Settings Making 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 Managing Fibre Channel Connections Modifying Controller Management Port SettingsViewing 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 Viewing SAS Port Statistics Modifying SAS Port SettingsViewing 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 Locating a Controller Adjustable itemsViewing Controller Information Viewing Controller Statistics Modifying Controller SettingsUpgradable 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 Viewing Physical Drive Information Modifying Physical Drive SettingsViewing 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 Logical Drive Creation Disk Array CreationSummary Viewing Disk Array Information Deleting a Disk ArrayDisk 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 Table Definitions Managing Logical Drive LUN SettingsLUN 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 Hot Spare Drives InitializationPartition and Format the Logical Drive Increase Redundancy From Capacity RAID Level MigrationAdd Lose Media Patrol 100 Predictive Data Migration PDM Transition101 PDM Triggers 102 Following is an example to explain the Transition function Automatic Transition 103Manual 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 Reported Event Corrective Action Battery Battery EventsEvent 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 Host 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 120 Reported Event Corrective Action Physical Disk 121 Physical Disk Events 122 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 126 Redundancy Check EventsResource Events Reported Event Corrective Action Redundancy Check 127 Spare Check EventsSpare Drives Events Smart Events Stripe Level Migration Events 128Reported 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 134 Enclosure ProblemsOverheating Power Supplies 135 136 137 138 139 Installing a Second ControllerDual Controllers and Sata Drives