Compaq 3000 manual Disk Drives

Page 37

RAID Array 3000 Controller Shelf

From the storage shelf’s perspective, the controller receives the I/O requests from the host and directs them to the devices. Since the controller processes all the I/O requests, it eliminates the host-based processing that is typically associated with reading and writing data to multiple storage devices.

The controller does much more than simply manage I/O requests: it provides the ability to combine several ordinary disk drives into a single, high-performance storage unit called a storageset. Storagesets are implementations of RAID tech- nology, also known as a “Redundant Array of Independent Disks”. Every stor- ageset shares one important feature: whether it uses two disk drives or 12, each storageset looks like a single storage unit to the host.

You create storage units by combining disk drives into storagesets such as stripe- sets, RAIDsets, and mirrorsets, or by presenting them to the host as single-disk units (see Figure 2–3).

Figure 2–3 Logical Units Created from Storagesets, Partitions, and Disk Drives

Logical

Mirrorset

Logical

Unit

Unit

Partitioned

Storageset

Stripset

Raidset

Disk Drives

Striped

Mirrorset

Logical

Partitioned

Unit

Disk Drive

 

Logical

 

Unit

2–4

EK–SMCPQ–UG. C01

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Contents RAID Array 3000 Controller Shelf Page Japan USA Contents Second Controller Option Installation and MaintenanceFigures Removing the Controller from the Shelf TablesRevision Record About This Guide Associated Documents Associated DocumentsStyle Conventions ConventionsNomenclature Convention RAID Advisory Board Description RAID Array 3000 UsageWho to contact in Europe Support and Services Who to contact in the AmericasWho to contact in Asia Pacific Product Description Product OverviewRAID Array 3000 Controller Shelf RAID Array 3000 6-Slot Device Expansion Shelf Optional DS-SWXRA-GH DS-SWXRA-GK DS-SWXRA-GN DS-HSZ22-AA Controller Shelf Part Numbers and Model DescriptionsController Shelf Enclosure Shelf FeaturesController Shelf Major Components Shelf Major Components Shelf Cabinet InstallationDevice I/O Module Upper Mounting Tab Device Port Connector Lower Device I/O Module Blower Status LEDs Host I/O ModuleCTR UPS Shelf Cooling Controller Shelf Power SuppliesPower Supply Uninterruptable Power Supply UPS6-Slot Device Expansion Shelf Optional Connecting the RA3000 Controller Shelf to a Host SystemHost System Host System SHR-1318 Host System Controller Shelf Technical Specifications SpecificationsShelf Technical Specifications Controller Shelf Power and Physical Specifications Controller Overview RAID Array ControllerRAID Array 3000 Single Controller Block Diagram Bridging the Gap Between the Host and Device Expansion Shelf Controller FeaturesDisk Drives LED/Reset Switch Interface Controller Reset and LED IndicatorsController Front Panel Flexible RAID Set ConfigurationCustom Components Performance EnhancementsEfficient Write and Read Algorithms RAID Levels Supported RAID Levels SupportedDescription Shelf RAID Set Restrictions RAIDRAID 0 Write RAID 0+1 Diagram of a RAID 1 WriteRAID 0+1 Example Diagram of RAID 0+1 WriteDiagram of a RAID 4 Write RAID Diagram of a RAID 5 Write System Parameters JbodRedundant Operation Message Passing InitializationFailover Response to Various AC Power Conditions Backup Power ManagementEnvironmental Installation Guidelines Installation and MaintenanceInstalling Shelves in the Cabinet Recommended Single Expansion Shelf Installation SHR-1097 SHR-1098 13 12 11 Shelf Support Mounting Kits and Installation Guides Installing Shelf SupportsRetma Cabinet Shelf Support Parts List Installing Shelf Supports in a Retma Cabinet Square Hole Retma Cabinet Shelf Supports Installing UPS BracketsUPS Rack-mount Bracket Mounting Hardware List UPS Rack-mount Bracket Assemblies UPS Bracket Retma and Metric Hole Locations Rear Power and Scsi Cable Connection Procedures Scsi Bus Target Addresses and Termination Installation and Maintenance Controller/ Single Device Expansion Shelf Cabling Diagram 10 AC Power Wiring Diagram RAID Array 3000 Controller Shelf 11 Controller/ Two Device Expansion Shelf Cabling Diagram RAID Array 3000 Controller Shelf Installation and Maintenance 12 Controller/ Three Device Expansion Shelf Cabling Diagram Installation and Maintenance RAID Array 3000 Controller Shelf 13 Controller/ Four Device Expansion Shelf Cabling Diagram RAID Array 3000 Controller Shelf 14 Shelf Status LEDs Controller Shelf Status LEDsReplacing Components FRU’s Controller LEDsController Shelf Field Replaceable Units 15 Controller Shelf Field Replaceable Units16 Replacing the Host I/O SBB Replacing a Host or Device I/O SBBReplacing a Power Supply SBB 17 Removing the Controller from the Shelf Replacing the RAID ControllerReplacing a Blower Replacing the UPS18 Replacing a Blower Assembly Replacing the Controller Memory Cache Modules 19 Controller Cache Modules 21 Remove Installed Simm Modules 22 Install Replacement Modules Introduction Second Controller OptionSave Existing Configuration Installing the UpgradeSaving the Existing Configuration Saved Configuration Update FirmwareUpdate Firmware Using Serial Interface Shutdown RA3000 Insert Module into Simm Connector Install Two SIMMs into Second ControllerRemove Controller from Top Slot Replace Existing ControllerRestoring Configuration to New Controller Restore ConfigurationInstall Original Controller Update Firmware on Second ControllerConfiguring the RA3000 for the Active Mode of Operation Configuring the Dual Controllers Verifying the Controller Operating Parameters Connecting to Your Dual Controller Storage SystemRAID Array 3000 Storage Subsystem
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