HP Lto 5 Manual

1InterfaceImplementation
HPLTOUltrium5drivesuseFibreChannelorSerialAttachedSCSI(SAS)astheinterfacetoconnect
tothehostsystem.
Thischaptergivesanoverviewofhowtheinterfaceoperates.Fulldetailsofthemessagesare
givenin“Messages”(page18),ofSASresponseframesandtaskmanagementfunctionsin
“Responseframesandtaskmanagementfunctions”(page19),andofcommandsin“Introduction
tocommands”(page22)and“Commands”(page29).
TheFibreChannelinterface
FibreChannelisanindustrystandard,approvedbytheAmericanNationalStandardsInstitute...

thismanual.TheANSIspecificationsdefinestheinterfaceingeneralwhilethisdocumentdescribes
theHPLTOUltriumimplementation.
TheSASimplementationprovidesadrivewithastandardsetoffeaturesandfunctions.These
includethefollowing:
•ImplementationofallmandatoryandmostoptionalcommandsoftheSequentialAccess
commandset
•SAS-2compliantinterface
•6Gbpsserialtransfers
•ConformancetothefollowingSCSIstandards:
SAM-4T10/1683-Drevision14◦
◦SAS-2(noversionclaimed)
◦SPC-4T10/1731-Drevision18
◦SSC-3T10/1611-Drevision05...

couldtakeupto3seconds.Fordrivesinlibraries,therewouldbeanadditionallibraryinitialization
timeontopofthesefigures.
Thefirstcommandreceivedfromaninitiator(otherthanINQUIRY,REQUESTSENSEandREPORT
LUNS)willresultinCHECKCONDITIONstatus,withUNITATTENTIONsensedatareportedfor
thepoweron.Oncethedrivehascompleteditsself-testandset-upprocedures,itwillattemptto
reloadanytapethatisalreadypresentinthedrive.Itmaytakesometimetorecoverthetape,
especiallyifitwaspositionednearEOMwhenpowerwascycled.Duringtaperecovery,medium...

Thefollowingtableindicatesthedrivebehaviorbothwithandwithouttransportlayerretries
enabled,foravarietyofpossibleerrorscenarios:
BehaviorErrorType
TransportLayerRetriesEnabledTransportLayerRetriesDisabled
ThedrivesendsNAK.
Theinitiatorrestartsdatatransferwiththe
ChangingDataPtrbitsetforthefirst
resentframe.
ThedrivesendsNAK.
Theinitiatorabortsthecommandusing
theABORTtaskmanagementfunctions.
DataframeCRCerroronwrites
TheinitiatorsendsNAK,driverestarts
transferfromstartofburstwithChanging...

FibreChanneloperation
ThefollowingsectionshaveinformationspecifictoFibreChanneloperation:
•“Protocol-SpecificLogicalUnitmodepage(FCdrives)”(page102)
•“Protocol-SpecificPortmodepage(FCdrives)”(page102)
•“VitalProductDatapages”(page40)
FibreChanneladdressing
BeforedescribingHP'simplementationofFibreChanneladdressing,theconceptsofNamesand
Addressesneedtobeclarified.
Names
Namesare64-bitidentifiersassignedpermanentlytothetapedriveduringmanufacture.Theyare...

HP'simplementationofnamesandaddresses
TheHPimplementationusesthreeadjacentIEEERegisteredNames:
•Thefirst(lastbits=00)isusedasthePort0WorldWideName.
•Thesecond(lastbits=01)isusedasthePort1WorldWideName(full-heightdrivesonly).
•Thethirdname(lastbits=10)isusedfortheDeviceWorldWideName.
(TheseareassignedduringmanufacturefromHP'spoolofnames,althoughonlythefirstwill
actuallybestoredinthedriveNV-RAM).
Theportaddresseswillbeassignedusingthe‘standard’AL_PAinitializationmechanisms.The...

Fieldreplaceableunits
AnFRUcodeidentifieswhichpartofthehardwareisconsideredtohavefailed.Thesecodesturn
upinsensedatabyte14andasthesensecodequalifierforsensecodes4400h(internaltarget
failure)and40XX(diagnosticfailure).
AlthoughtherearenoactualFieldReplaceableUnitsonHPLTOUltriumdrives,thefollowing
sub-assembliescanbereplacedatRepairCentres:
•HeadAssembly
•FrontPanel
•DrivePCA
•Mechanism
CD-ROMemulation(SASdrivesonly)
TheOneButtonDisasterRecovery(OBDR)functionalityinHPLTOUltriumdrivesenablesthemto...

2Messages
Status
AStatusbyteissentfromthedrivetothehostduringtheStatusphaseattheendofeachcommand
asspecifiedintheSCSIspecification,unlessthecommandhasbeenclearedbyanABORTmessage,
byaBUSDEVICERESETmessage,orbyahardreset.
TheStatusbytesthatthedrivereturnsareasfollows:
GOOD:Thisstatusindicatesthatthedrivehassuccessfullycompletedthecommand.00h
CHECKCONDITION:Anyerror,exception,orabnormalconditionthatcausessensedatatobeset
returnsCHECKCONDITION.TheREQUESTSENSEcommandshouldbesentfollowingthisstatusto...

3Responseframesandtaskmanagementfunctions
Responseframes
ThissectiondescribestheformatofSASresponseframesreturnedbyHPLTOUltriumtapedrives.
ResponseframesprovideawayforthedrivetoreporttheoutcomeofallSCSIcommandsandtask
managementfunctions:
01234567
Reserved(0)0–7
StatusQualifier(0000h)7
8
DATAPRESReserved(0)10
Status11
Reserved(0)12–15
SenseDataLength(nbytes)(MSB)16
(LSB)19
ResponseDataLength(mbytes)(MSB)20
(LSB)23
ResponseData(ifany)24
23+m
SenseData(ifany)24+m
23+m+n...

NeverreturnedbyanHPLTOUltriumtapedrive.INTERMEDIATECND14h
Thedriveisreservedbyanotherparty.SeetheReservation
check.
RESERVATION
CONFLICT
18h
NeverreturnedbyanHPLTOUltriumtapedrive.COMMAND
TERMINATED
22h
Thedrivecannotacceptanothertaskatthemoment
becausetheinternallimithasbeenreached.Tryagain
later.
TASKSETFULL28h
TypicallynotreturnedbyanHPLTOUltriumdrivebutmay
beinsomecircumstances;forexample,onaFibreChannel
drive,ifHostAsendsLogicalUnitResetthenTaskAborted
wouldbesenttoanoutstandingRewindonHostB....