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HP Lto 5 Manual

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    							DescriptionTaskManagementFunctionCode
PerformstheCLEARTASKSETtaskmanagementfunctionwith:
L=LogicalUnitNumberfield
CLEARTASKSET04h
PerformstheLOGICALUNITRESETtaskmanagementfunctionwith:
L=LogicalUnitNumberfield
LOGICALUNITRESET08h
SupportedbyFCforlegacyFChostdrivers.TARGETRESET10h
I_TNEXUSRESET10h
Reserved20h
NotsupportedCLEARACA40h
PerformstheQUERYTASKtaskmanagementfunctionwith:
L=LogicalUnitNumberfield
Q=TagofTasktoBeManagedfield
QUERYTASK(SASonly)80h
QUERYTASKSET81h
QUERYASYNCHRONOUS
EVENT
82h
Reservedothers
Taskmanagementfunctions21
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    							4Introductiontocommands
ThischaptercontainsnotesrelatingtotheSCSIcommandslistedin“Commands”(page29).
Summary
ThefollowingtableisasummaryoftheSCSIcommandsforsequentialaccessdevices,showing
theoperationcode:
CommandNameOpcode
TESTUNITREADY00h
REWIND01h
REQUESTSENSE03h
FORMATMEDIUM04h
READBLOCKLIMITS05h
READ08h
READ6(CD-ROM)08h
WRITE0Ah
SETCAPACITY0Bh
WRITEFILEMARKS10h
SPACE11h
INQUIRY12h
VERIFY13h
MODESELECT15h
RESERVEUNIT16h
RELEASEUNIT17h
ERASE19h
MODESENSE1Ah
LOAD/UNLOAD1Bh
START/STOPUNIT(CD-ROM)1Bh
RECEIVEDIAGNOSTICRESULTS1Ch
SENDDIAGNOSTIC1Dh
PREVENTMEDIUMREMOVAL1Eh
READCAPACITY(CD-ROM)25h
READ10(CD-ROM)28h
LOCATE2Bh
SEEK(CD-ROM)2Bh
READPOSITION34h
WRITEBUFFER3Bh
READBUFFER3Ch
22Introductiontocommands
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    							CommandNameOpcode
READTOC(CD-ROM)43h
REPORTDENSITYSUPPORT44h
LOGSELECT4Ch
LOGSENSE4Dh
MODESELECT(10)55h
RESERVEUNIT(10)56h
RELEASEUNIT(10)57h
MODESENSE(10)5Ah
PERSISTENTRESERVEIN5Eh
PERSISTENTRESERVEOUT5Fh
READATTRIBUTE8Ch
WRITEATTRIBUTE8Dh
REPORTLUNSA0h
SECURITYPROTOCOLINA2h
REPORTDEVICEIDENTIFIERA3h(05h)
REPORTTARGETPORTGROUPSA3h(0Ah)
REPORTSUPPORTEDOPCODESA3h(0Ch)
REPORTSUPPORTEDTASKMANAGEMENTFUNCTIONSA3h(0Dh)
REPORTTIMESTAMPA3h(0Fh)
EnhancedFIRMWAREUPGRADEREPORTIMAGEINFORMATIONA3h(1Fh)
READLOGGED-INHOSTTABLEA3h(1Fh)
REPORTSNAPSHOTSAVAILABLEA3h(1Fh)
READSNAPSHOTLOGA3h(1Fh)
READSTTFLOGA3h(1Fh)
REPORTSNAPSHOTCOMMANDSA3h(1Fh)
REPORTSNAPSHOTCONFIGURATIONA3h(1Fh)
REPORTEnhancedSNAPSHOTCONFIGURATIONA3h(1Fh)
SETEnhancedSNAPSHOTCONFIGURATIONA3h(1Fh)
READFIRMWARETRACELOGA3h(1Fh)
REPORTIPCONFIGURATIONA3h(1Fh)
SETIPCONFIGURATIONA3h(1Fh)
MANAGEMENTARMSELF-TESTA3h(1Fh)
REPORTNETWORKSTATISTICSA3h(1Fh)
SETDEVICEIDA4h(06h)
SETTIMESTAMPA4h(0Fh)
EnhancedFIRMWAREUPGRADEDOWNLOADFIRMWARESEGMENTA4h(1Fh)
EnhancedFIRMWAREUPGRADEREBOOTA4h(1Fh)
Summary23
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    							CommandNameOpcode
FORCEDEJECTA4h(1Fh)
FORCESNAPSHOTA4h(1Fh)
SETSNAPSHOTCOMMANDSA4h(1Fh)
SETSNAPSHOTCONFIGURATIONA4h(1Fh)
READMEDIASERIALNUMBERABh(01h)
SECURITYPROTOCOLOUTB5h
SAS-specificVendor-UniqueENABLETLRSC2h
Commanddetails
Thecommanddescriptionsin“Commands”(page29)arelistedinalphabeticalorderofcommand
name(ignoringwordslike“Enhanced”and“Vendor-unique”).Eachcommandisdescribedbriefly.
Thisisfollowedbyalistofpre-executioncheckswhicharedescribedbelow.TheCommand
DescriptorBlock(CDB)isthengiven,withdetailsofthevariousparameterbitsandfields.
Pre-executionchecks
NOTE:IncompliancewiththeSCSIspecification,thedriveterminatesacommandwithaCHECK
CONDITIONstatusandsetsthesensekeytoILLEGALREQUESTwhenareservedbit,byte,field
orcodeisreceivedwhichisnotzero.
Beforeexecutingacommand,thedrivemakesanumberofchecks.Theyfallintothreecategories:
•Checksonthecommandsentbythehost.Theseensurethatnoreservedorfixedfieldshave
beensettoillegalvalues.Theycheckthesyntaxofcommands,inotherwordsthecross
dependencyoffields.Forexample,theFlagbitmustnotbesetiftheLinkbitisnotset.
•CheckstoensurethattherearenooutstandingUNITATTENTIONorDEFERREDERRORevents
postedforthehostthathassentthecommand.
•Checksonmediaaccessabilities.Theseareperformedforcommandsrequiringaccesstothe
cartridge.Acommandisrejectedifitattemptstoaccessthecartridgewhennocartridgeis
presentorthecartridgeisunloaded.
Thechecksaredescribedbelowinalphabeticalorder.TheusualorderofexecutionisIllegalField,
FixedBit,FlagLink,BadLUN,Reservation,DeferredError,UnitAttention,MediaAccess,Media
Write,DiagnosticStatus,Humidity,ParameterList.
BadLUNcheck
ForallcommandsexceptINQUIRY12h,thischecksthattheLUNspecifiedbythehostiszero.The
LUNistakenfromtheCOMMANDframethatencapsulatesthecommanddescriptorblock.
•IftheLUNisunsupported,andthehostcommandisnotREQUESTSENSE,INQUIRYorREPORT
LUNS,CHECKCONDITIONisreportedtothehostwithasensekeyofILLEGALREQUEST,
andadditionalsenseof2500h(logicalunitnotsupported).
•IftheLUNisunsupported,andthehostcommandisREQUESTSENSE,theoriginalsensedata
isreplacedwithasensekeyofILLEGALREQUEST,andadditionalsenseof2500h(logical
unitnotsupported).Thisnewsensedataisreturnedtothehost.Oncethecommandhas
completedsuccessfully,thesensedataiscleared.
24Introductiontocommands
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    							DeferredErrorcheck
Adeferrederrorisgeneratedwhenacommandwithimmediatereportfailsafterthereporthas
beenreturned.Thechecklookstoseeifadeferrederrorexistsforthehostwhichsentthecommand,
inotherwords,adeferrederrorforwhichCHECKCONDITIONstatushasnotyetbeenreported.
Ifsuchanerrorexists,thenthedrivereportsCHECKCONDITION.Thesensedataforthecommand
issettoDEFERREDERROR(whichwasgeneratedwhensomepreviouscommandfailed).
NotethatifaUNITATTENTIONconditionandaDEFERREDERRORconditionbothexistforan
initiator,theDEFERREDERRORconditionwillbereportedfirst.Thisisbecausetheoperationleading
tothedeferrederrormusthavebeenolderthanthatleadingtotheunitattention.Thedrivereports
theconditionsintheorderinwhichtheyarose.
DiagnosticStatuscheck
Thisensuresthatthedriveisinafitstatetoaccessthemedia.Itdoesthisbycheckingthatthere
isnoDIAGNOSTICFAILstatuswithinthedrive.
Ifthedrivehasfaileddiagnostics,CHECKCONDITIONisreportedwithasensekeyofHARDWARE
ERRORandadditionalsenseof400Xh(diagnosticfailureoncomponentX).
FixedBitcheck
FortheREAD,VERIFYandWRITEcommands,aFixedbitsetto1indicatesthatthelengthparameter
ofthecommandisforfixedblockmode.Iffixedblockmodeisselectedthentheblocksizeinthe
ModeSelectblockdescriptormustnotbezero.OtherwiseCHECKCONDITIONisreportedand
thesensedataissetasdescribedfortheILLEGALFIELDcheck.
FlagLinkcheck
ThischeckensuresthatthehosthasnotsettheFlagbitinthecontrolbyteofthecommandwithout
settingtheLinkbitaswell.IfthetestfailsthenCHECKCONDITIONisreportedwithasensekey
ofILLEGALREQUESTandadditionalsenseof2400h(invalidfieldinCDB).TheFlagfieldis
identifiedasthebadfield.
IllegalCommandcheck
Ifthedrivedoesnotrecognizetheopcodeofthecommandthatithasbeensent,itwilldooneof
thefollowing:
•ReportCHECKCONDITIONstatus.ThesensekeywillbesettoILLEGALREQUESTandthe
additionalsensecodewillbesetto2000h(invalidcommandopcode).
•Reportaninvalidfieldinthecommanddescriptorblock.ThesensekeywillbesettoILLEGAL
REQUEST,theadditionalsensecodewillbesetto2400h(invalidfieldinCDB)andthefield
pointerinthesensedatawillbezero.
IllegalField/Requestcheck
Checksareperformedtoensurethehosthasnotsetanyofthefollowinginthecommanddescriptor
block:
•afixedfield
•areservedfield
•thecontrolfield
•twoormorefieldstologicallyconflictingvalues
Pre-executionchecks25
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    							Ifafieldhasbeensettoanillegalvalue:
•CHECKCONDITIONstatusisreportedtothehostwithasensekeyofILLEGALREQUESTand
additionalsenseof2400h“invalidfieldinCDB”.
•Thesensekeyspecificbitissetandthesensekeyspecificbyteswillbeafieldpointer.
•Thecommand/databitisset,indicatingthattheillegalparameterwasinthecommand.
NOTE:Commanddescriptorblocksarescannedfromleft(bit7)toright(bit0),anddown
(frombyte0tobyten).Thefieldpointerwillbesettopointtothefirstbitofthefirstillegal
fieldencounteredusingthisscanningroute.Insomecases,wheremultiplefixedfieldsare
contiguous,thefieldpointermightbesettopointtothefirstbitofthefirstfixedfieldinthe
groupoffixedfields,whereastheactualillegalitymaylieinalaterbit.
MediaAccesscheck
Thischecksifthedriveisabletoperformmediaaccesscommands.Ifthemediaisinaccessible
thenCHECKCONDITIONstatusisreportedwithasensekeyofNOTREADY.Theadditionalsense
willbesettooneofthecodesassociatedwiththeNOTREADYkey.
MediaInformationcheck
Duringpower-onandfollowingaSCSIreset,knowledgeofthewhereaboutsofthecartridgeis
unavailable.Itisnotpossibletoexecutecommandswhichassumethatthisknowledgeisavailable
untilthedrivehasrecoveredfromthepower-onorreset.
Thetestcheckswhetherthedriveknowsifacartridgeisphysicallypresentinthedrive.
Ifinformationaboutthetapecartridgeisnotavailable,thetestfailswithCHECKCONDITION,a
sensekeyofNOTREADY,andadditionalsenseof3E00(logicalunithasnotself-configuredyet).
MediaWritecheck
Thischeckswhetherthemediaiswrite-protected.Ifitis,CHECKCONDITIONisreportedwitha
sensekeyofDATAPROTECTandadditionalsenseof2700h(write-protected).
26Introductiontocommands
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    							ParameterListcheck
ForLOGSELECT,MODESELECTandsomediagnosticcommands,theassociateddatasenttothe
driveisintheformofparameterlists.Thesearedescribedunderthecommandnamesinthenext
chapter.Checksareperformedtotestthefollowing:
•Fixedandreservedfieldshavenotbeenmodified.Fixedfieldsareindicatedbyanumberin
roundbracketsfollowingthefieldname.
•Afieldhasbeensettoaninvalidvalue.
•Thesyntaxofthepageofparametershasbeenviolated—forexample,whereaparticular
valueinonefieldimposeslimitationsonthevalidrangeforanotherfield.
Ifafieldhasbeensettoanillegalvalue,CHECKCONDITIONisreportedtothehostwithasense
keyofILLEGALREQUESTandadditionalsenseof2600h(invalidfieldinparameterlist).
ThedrivescansthedataintheCommandDescriptionBlockfrom“left”(bit7)to“right”,and
“down”(frombyte0tobyten).Itsetsthefieldpointerstothefirstbitofthefirstbadfield
encountered.Ifthebadfieldiscontainedinacontiguousgroupoffixedfields,thepointersindicate
thefirstbitofthefirstfieldinthegroup,eventhoughtheerrormaybeinalaterfieldinthegroup.
NOTE:WithMODESELECT,thedrivecheckstheintegrityofthewholeparameterlistbefore
actingonanyparameters,soallthemodeparametersneedtobecorrectbeforeanyofthemare
implemented.
Reservationcheck
Thischeckstoseeifthedrivehasbeenreservedforusebyahost,andifithas,whetherthehost
isthesamehostthatsentthecommandbeingexecuted.
IfthedrivehasbeenreservedforsomeotherhostthenRESERVATIONCONFLICTstatusisreported.
Seethecommands“PERSISTENTRESERVEOUT5Fh”(page120),“RELEASEUNIT17h/57h”
(page157)and“RESERVEUNIT16h/56h”(page197).
UnitAttentioncheck
ThischecksifaUNITATTENTIONconditionexistsforthehostwhichsentthecommand.Ifitdoes,
thedrivereportsCHECKCONDITIONstatuswithasensekeyofUNITATTENTION.Theremaining
sensedatawillbesetaccordingtotheunitattentionconditionwhichexists.SeeUnitAttention
Senseinthedescription“REQUESTSENSE03h”(page182).
Commanddescriptorblock
ASCSIcommanddescriptorblock(CDB)isasequenceof6,10,12or16bytessentbyahost
toaSCSItargetwiththebusincommandphase.TheCDBtellsthedrivewhatactionshouldbe
performed.
01234567
OperationCodeGroupCode0
Reserved(0)1
Multi-ByteParameter(MSB)2
(LSB)n-1
Link(0)Flag(0)NACA(0)Reserved(0)VendorUnique(0)n
Commanddescriptorblock27
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    							ThereareanumberoffieldsinaCDBwhicharecommontoallcommands.Theseareshownin
thefollowingtable.
Theoperationcodeuniquelyidentifiesthecommand.Thetopthreebitsoftheoperationcode
areknownasthegroupcodeandthesedefinethelengthofthecommanddescriptorblock:
GroupCodeand
OperationCode
Six-bytecommands
Ten-bytecommands
Ten-bytecommands
Six-bytecommands
Sixteen-bytecommands
Twelve-bytecommands
Vendor-uniquecommands
notsupported
Group0
Group1
Group2
Group3
Group4
Group5
Group6
Group7
Areservedfieldshouldalwaysbesettozero.Thedrivechecksreservedfields,andifoneis
non-zerothenitwillrejectthecommandwithCHECKCONDITION.
Reserved
Amulti-byteparameterfieldinacommandis“big-endian”,thatis,bit7ofthefirstbyteofthis
fieldisthemostsignificant.
Multi-ByteParameter
Thecontrolfieldismainlyconcernedwiththeuseoflinkedcommands.Thesearenotsupported
bytheLTOSCSIcommandset,soaCHECKCONDITIONwillbegeneratedifthisfieldisset
toanythingotherthanzero.
Control
ThisfieldisignoredbythefirmwareVendor-Unique
TheNormalACAflagis0,indicatingthatitisnotsupported.0NACA
0Flag
Linkedcommandsarenotsupported.0Link
28Introductiontocommands
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    							5Commands
ThischapterdescribesallSCSIcommands.PartsofthechapterarebasedonsectionsoftheSCSI
specification(see“Generaldocumentsandstandardization”(page233)).
Forgeneralnotesonthecommanddescriptions,see“Introductiontocommands”(page22).
Vendor-uniqueENABLETRANSPORTLAYERRETRIES(SASdrivesonly)
C2h
ThisprovidesafastbenigncommandtoenableSASTransportLayerRetries.Thestateofthe
TransportLayerRetriessetbythiscommandforagivenhostisreflectedintheProtocol-Specific
LogicalUnitmodepageforSASSSP(18h)forthathost.
Pre-executionchecks
IllegalField
Ifthecheckpasses,GOODstatusisreported.
Commanddescriptorblock
01234567
OperationCode(C2h)0
EnableReserved(0)1
Reserved(0)2–4
Control5
CDBfields
EnablesordisablesSASTransportLayerRetriesforthisinitiator:Enable
Disabled0
Enabled1
EnhancedFIRMWAREUPGRADEDOWNLOADFIRMWARESEGMENT
A4h(1Fh)
TheEnhancedFIRMWAREUPGRADEDOWNLOADFIRMWARESEGMENTcommandallowsthe
applicationclienttodownloadafirmwareimage,viaaninternalcachebuffer,totheSecondary
Imagebank.Noimageshouldbeconsideredwrittentotheflashuntilthiscommand,sentwith
LAST=1,returnsGOODstatus.
Pre-executionchecks
DeferredErrorReservationIllegalFieldUnitAttention
Commanddescriptorblock
01234567
OperationCode(A4h)0
ServiceAction(1Fh)Reserved(0)1
Vendor-uniqueENABLETRANSPORTLAYERRETRIES(SASdrivesonly)C2h29
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    							01234567
HPLTOVUMIOpcode(05h)2
SegmentOffset(MSB)3
(LSB)5
SegmentLength(MSB)6
(LSB)8
Reserved(0)9
LastReserved(0)10
Control11
CDBfields
Theoffsetwithinthebankatwhichthissegmentwillbestored.Theapplicationclientmust
setthistozeroforthefirstdownloadsegmentcommand.(Itispossibletore-startthefirmware
downloadprocessmanytimesbysettingSegmentOffsettozero).Thefieldhasthefollowing
restrictions:
•Itmustbeamultipleof4bytes.
•Itmustresidewithinthebanksize(1.91MB).
SegmentOffset
Theapplicationclientisstartingafirmwaredownloadprocess.0
Thelengthinbytesallocatedofthesegmenttransferred.SegmentLength
Thesegmentwillbecopiedtotheinternalcachebufferatthespecifiedoffset.0Last
ItisassumedthatthelastbyteoftheimageisSegmentOffset+SegmentLength.
Thenthewholeimageisvalidated,andifcorrect,transferredfromthecache
buffertoflash.Statuswillnotbereturneduntilthefirmwarehasbeensuccessfully
writtentotheSecondaryImagebank.
1
EnhancedFIRMWAREUPGRADEREBOOTA4h(1Fh)
TheEnhancedFIRMWAREUPGRADEREBOOTcommandcausesthedrivetoresetandbootfrom
thePrimaryImagebank.Statuswillbereturnedbeforereboottakesplace.Beforethereboot,all
bufferedwritedataiswrittentotape,andthetapeisunloaded,orunthreadeddependingon
configurationsettings.
Pre-executionchecks
DeferredErrorReservationIllegalFieldUnitAttention
Commanddescriptorblock
01234567
OperationCode(A4h)0
ServiceAction(1Fh)Reserved(0)1
HPLTOVUMIOpcode(06h)2
SwapReserved(0)3
Reserved(0)4
10
Control11
30Commands
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