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EverhartICEverhart@star.enet.dec.comIAb€‚Author£€ €£€Ô$P«€ €¡€"€b€£€²€£€€ `C(Digital Equipment Corp., VMS EngineeringIAIb€£€²€£€€ `CNew Features Being AddedIAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€C/* Wider IDs (16 IDs per bus if the bus is wide)IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€C-* Cluster support with new drivers (PKS, PKQ)IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€C* Fast 20 supportIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€C:* Device Naming changes (to support simpler configurationsIICin SCSI Clusters)IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€C)* Mode sense code in VAX like Alpha code.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€C.* Synchronous, Modesense, and TCQ improvementsIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€C&* Better SCSI arbitration compensationIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€C5* SCSI-3 and Fibre Channel work going on, further outIAJb€‚Author£€ €£€Ô$P«€ €¡€"€ª€¡€€þpb€£€²€£€€ `IAAb€‚Author£€ €£€Ô$P«€ €¡€"€ª€¡€€þpb€£€²€£€€ `ICWhat This Means To YouIAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `IC)* More 3rd party devices will "just work"IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C+* Initial ~ 11 errors on some disks go awayIAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C(* Some new options exist to avoid errorsIAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C.* SCSI cluster configurations easier to set upIIC-* Opticals may no longer need special driversIAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C/* Less device timeout errors under extreme loadIAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C7* Fibre and SCSI-3 will mean larger areas, more devicesIIIAAb€‚Author£€ €£€Ô$P«€ €¡€"€ª€¡€€þpb€£€²€£€€ `CWhat Problems Have There BeenIC(3rd Party Devices)IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `IC;* VMS supplies class drivers, one for all devices of a kindIAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C6* SCSI must negotiate several things before a transferIICcan be set up:IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C! > What devices are at this ID?IC0 > What synchronous/asynch counts may be used?IC% > Is the device a wide-bus device?IC" > How should errors be handled?IC+ > Can the device handle tagged commands?IC/ > What geometry or density parameters exist?IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C5* In addition it must assume that for most purposes aIIC"device" is an ID and a LUNIAAJb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C8* Each of these gives rise to problems with some devicesIACP (Digital qual deals with these for Digital devices; 3P support is the issue.)Ib€£€²€£€€ `IC$Issue: What devices are at this ID?IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Problems:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCA* Some devices hang, respond to all LUNs alike, get confused whenIIC1commands to multiple LUNs are sent to the devicesIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC@* Much more common on tapes due to PC-oriented manufacturers andIIC+cost factors. CDs also often fail this way.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Approaches:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCC* Code knows some devices that cannot handle LUN commands. PreventsIIC7autoconfigure from ever trying multiple LUNs for those.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC?* SYSMAN IO exclude command. Allows devices to be excluded fromIIC>autoconfigure, configure them manually (e.g. in systartup_vms)IIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpIAIb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C2Issue: What synchronous/asynch counts may be used?IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpIC Problems:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC;* Some 3P devices report synch support, but it doesn't workIIC(* Unusual responses to synch negotiationIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC?* Devices that run synch for user data, asynch for command dataIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Approaches:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC-* Again, software knows some "rogue" devices.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCG* VMS drivers will accept much larger range of responses, will only useIIC;synchronous mode after a completely successful negotiation.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCD* System will try more combinations of command modes to find one theIICdevice can accept.IIIC3>>> Wide negotiation is very similar to synchronousIAJb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C$Issue: How should errors be handled?IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Problems:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC@* VMS drivers have rejected some safe error options in the past.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCL* Bad block recovery has lost data on old SCSI-1 disks. (VMS rejects these.)IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Approaches:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCH* Most safe error recovery options now accepted. (One unsafe one is "RC"IICHwhich allows the device to report phony data if set.) VMS will not allowIIC+this. Where data integrity and logging are b€£€²€¢€CnotAC compromised, VMS willIIC@allow the device as a local one. (Mostly affects opticals, some IICintelligent controllers.)IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCE* Devices on a shared cluster bus must still support more restrictiveIICBrecovery, and must support device error correction (since VMS doesIIC-not coordinate error recovery of bad blocks).IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCH* Mode pages can be missing completely if their information can be foundIICDotherwise or can be defaulted. Again, this mostly benefits opticals.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCB* Transient error recovery is much more robust in new VMS drivers.IAIb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C8Issue: How should unfair SCSI arbitration be dealt with?IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Problems:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC5* SCSI arbitration is inherently unfair...higher IDs b€£€²€¢€Calways ACwinIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC(* Commands must be timed out in practiceIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC%* Busy devices can "starve" lower IDsIIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Approaches:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCL* TQE driven code checks for "at risk" I/O, stops higher ID's I/O if timeoutIIC is imminent.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCG* On a shared bus, periodic INQUIRY to all devices will ensure that allIIC=initiators "see" the at-risk I/O. (This is current thinking.)IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC>* If this is an issue now, put the initiators at low SCSI IDs.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpIIAIb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C-Issue: Can the device handle tagged commands?IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Problems:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCG* Tagged commands are needed for clusters because they give an orderingIIC guarantee.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC;* Queue tag values supported may not be all of 0-255 range.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCC* Mis-implemented by some 3rd party manufacturers at times. Lack ofIIC;fairness counts, misunderstood tag meanings, and tag rangesIIC@all have been reported problem areas. (Digital device qual testsIICthese things.)IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC<* First was used in VMS 6.2; some devices apparently "broke"IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Approaches:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC(* "Rogue" devices are known to software.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCF* Recognize DQUE bit, so that tagged queueing can be turned off at theIICdevice in most cases.IIAJb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `C1Issue: What geometry or density parameters exist?IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Problems:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCJ* Some devices report no geometry information, or information which cannotIIC!be used for a legal VMS geometry.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCC* Some tape types use vendor unique density or compaction controls.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC Approaches:IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCI* Device geometry is now fabricated if the device doesn't give it. DeviceIICsize is still needed.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCI* While device block size must be 512 bytes, non-512-byte block disks mayIICat least permit $qio access.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCJ* Tape density issues still under investigation. Compaction has been made IICBmore likely to work due to firmware updates. (Issue only with someIICB3rd party manufacturers; compaction is standard on Digital tapes.)IAJb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpIb€£€²€£€€ `C,What Can You Do when your device won't work?IAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC&* Check your cables and terminators!!!IICE* SCSI_INFO in the SYS$ETC directory will report the first mode pagesIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC* Error log informationIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC* SCSI documents at b€£€²€¢€Cftp.symbios.comAC$ site if you want references. (TheseIICCare draft standards only, but ordering info for final ones is thereIICalso.)IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCB* SCSI_MODE tool will allow mode page data to be written provided IICyou know the SCSI offsets. Do b€£€²€¢€CnotAC use this unless you knowIICwhat you're doing!!!IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCF* Look for block size (should be 200 hex), device type in mode headersIICif you have the standard handy.IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCE* Remember to check DIP switches on the device, set appropriately forIICa multiuser system.IAb€‚Author£€ €£€Ô$P«€ €¡€"€ª€¡€€þpIJIb€£€²€£€€ `C ConclusionIAAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpb€£€²€£€€ `IACC* VMS is becoming much more 3rd Party Device - friendly, so long asIICdata integrity OK. IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCF* (Hopefully you begin to understand some of what Digital's I/O deviceIIC:qualification does to filter out weird behavior and bugs.)IAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpCC* Drivers to support faster I/O (speed and width!) and more devicesIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC>* Cluster configuration SCSI device naming will be much easierIAb€‚Author£€ €£€Ô$P«€ € €!€€¡€"€ª€¡€€þpC>* SCSI-3 and Fibre Channel are on the way. This should supportIIIC> Very large SCSI I/O farmsIIC> Much larger physical geometryIIC@> SCSI bus as the cluster bus (and possibly for other protocols)IIC;> Device naming changes to support much larger device farmsIIC> VMS will still be the b€£€²€¢€Conly AC"system where clustering will allowIIIC3fully concurrent device access from multiple hosts.IIAAAAA