IBM 32H3816 manual Loops and Data Paths

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SSA RAID Adapter Installation and User's Guide.

Loops and Data Paths

C.1.1.1 Loops and Data Paths

All devices that are attached to an SSA adapter card 1 are connected through SSA links 2 . The SSA links are configured in loops. Data and commands to a particular device pass through all other devices on the link between the adapter and the target device.

Data can travel in either direction round a loop. The adapter can, therefore, get access to the devices 3 (disk drives in this example) through two data paths. The system cannot detect which data path is being used.

If a disk drive fails, or is turned off, the loop is broken, and one of the data paths to a particular disk drive is no longer available. The disk drives on the remains of the loop continue to work, but an error is reported to the system.

In the diagram, disk drive number 3 has failed. Disk drives 1 and 2 can communicate with the system only through connector A1 of the SSA adapter. Disk drives 4 through 8 can communicate only through connector A2 of the SSA adapter.

_ Copyright IBM Corp. 1996

C.1.1.1 - 1

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Contents Document Number S32H-3816-00 Part Number 32H3816 Cover Book CoverProduct it supports, be Edition Edition Notice Contents Table of Contents FRONT1 Safety Information Safety Information Copyright IBM Corp FRONT1 SSA RAID Adapter Installation and Users Guide Preface About This Book PREFACE.1 How This Book Is Organized PREFACE.2 Related Publications Introducing the SSA RAID Adapter SSA Adapter Card RAID Operating Systems Before Installing the Adapter Installation Requirements Installing an SSA RAID Adapter Installing the Adapter Card Connecting the Disk Drives Configuring the Disk Drives Installing an Operating System Installing the Device Drivers and Utility Programs Selecting Your Boot Device Configuring SSA Subsystems Vyymmdd Running the Configuration UtilityAccepting New Disk Drives Creating an Array Adapter New Disks RAID-0 Arrays Free Resour Service Aids Vyymmdd XX Version Main M+ Bus Device YList of RAID-X Arrays Non-VolaArray name Status Serv BusRej S Main M+ Bus + QNon a Hot aSSA RAID Adapter Installation and Users Guide Main Menu New Disks List of System Resources Attaching ResourcesSystem ResoSSA UID/Array Name Status F1 Help F9 FlashOnCANUID111 Dealing with Disk-Array Problems Basic Problems Array Problems F3 Certify ServiceMode F5 Diagnostics F9 FlashOn Disk Service Aids New Disks LinkChanging Failed Disk Drives BlankSSA RAID Adapter Installation and Users Guide Performing Other Disk-Array Tasks Select Hot-spare disks Defining a Hot SpareList of Hot-spare Disks SSA Configurator and Service Aids Vyymmdd Version Main M+No1 Ho2Viewing the Physical Configuration Viewing Resources and Their Attributes Fre View Physical Disk Sys+ Main Menu New+Attr1aaaa Changing Array Attributes Device Y Slot Z Adapter New Disks RAID-0 Arrays Free Resour View Adapter VPD Disk Service Aids Escape Exit Enter SelectRAID-5 a List of RAID-X Arrays Xxxxxxxx Yyyyyyy Abou BusEscape Exit Enter Select F1 Help F9 FlashOn F10 FlashOff Exchanging a Member of an ArraySystem Res+ Candidates for RAID-X Arrays View RAID-X ArraysUIDxxxxx Status SSA Adapte AttDeleting an Array FF00xxxx Qqqqqqq U.S Canada Markham Montreal Toronto Getting the Latest InformationAppendix A. Multiple-Adapter Installations Appendix B. SSA RAID Adapter Service Request Numbers Not exchange any Dram Modules yet Failed 41064 a 64 MB Dram moduleSSA RAID Adapter Installation and Users Guide Dffff SSA adapter microcode has Call for service HungSSA Loop Configurations that Are Not Valid Subtopics Serial Storage Architecture SSA RAID Functions Appendix C. Introducing SSA and RAIDSubtopics SSA Loops and Links Rules for SSA Loops Serial Storage Architecture SSASubtopics Loops and Data Paths SSA Loops and LinksLoops and Data Paths SSA RAID Adapter Installation and Users Guide Loops and Data Paths Copyright IBM Corp 1.1 Rules for SSA Loops Subtopics RAID-0 RAID-1 RAID-5 Hot Spares Disk Array States RAID FunctionsRAID-0 RAID-1 RAID-5 Hot Spares Disk Array States Good State Exposed State Degraded State Rebuilding State Offline State Appendix D. Product Warranty and Notices Machine SSA RAID Adapter for PC Servers Warranty Period* Three yearsProduction Status IBM Warranty Warranty Service Extent of Warranty Limitation of Liability SSA RAID Adapter Installation and Users Guide IBM Communications Statements Federal Communications Commission FCC Statement This equipment is Type 1 Data Processing Vcci StatementRadio interference. VCCI-1 International Electrotechnical Commission IEC Statement Avis de conformité aux normes de lIndustrie Canada Industry Canada Compliance Statement United Kingdom Telecommunications Requirements EC Council Directive Hinweis Radio Protection for GermanyGood state C.2.5.1 Hot spares defining 5.1 function C.2.4 Installing Write while exposed C.2.5.2 Information, latest 6.0 information, more 6.0 installing

32H3816 specifications

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