Toreplacea faultynode intheclusterusingtheSANVolumeControllerConsole, completethesetasks.
Before youattempttoreplaceafaultynodewithaspare nodeyoumustensure that:
v SANVolumeControllerversion 1.1.1orhigherisinstalledontheclusterandon thesparenode.Thecodelevels areavailablefromthenodeandclusterVPD.
Youcanalso issuethesvcinfo lsnodeorsvcinfo lsclustercommandsto determinetheSANVolumeControllerversion.
v Youknowthenameof theclusterthatcontainsthefaultynode.
v Asparenode isinstalledinthesamerack astheclusterthatcontainsthefaulty node.
v Youmakearecordof thelastfivecharactersof theoriginal worldwidenode name(WWNN)of thespare node.Youwillneedthisinformation, ifandwhen, youwanttostopusingthisnode asa sparenode. Inthatcase,youmightprefer touseit asanormalnodethatcanbeassignedtoanycluster.
PerformthefollowingstepstodisplayandrecordtheWWNNofthespare node:
1. Displaythenodestatusonthefrontpaneldisplayof thenode.SeetheIBM TotalStorageSANVolumeController:ServiceGuideformoreinformation.
2. Withthenodestatusdisplayedonthefrontpanel,pressandholdtheDown button;pressandreleasetheSelectbutton;releasetheDownbutton.WWNN isdisplayedonline-1of thezdisplay;line-2of thedisplaycontainsthelast fivecharactersoftheWWNN.
3. RecordtheWWNNina safeplace.Itwillbeneededif youwanttostopusing thesparenode.
If anodefails,theclustercontinuestooperatewithdegradedperformance,until the faultynodeisrepaired.If therepair operationislikelyto takeanunacceptable amountof time,it mightbeusefultoreplacethefaultynodewithasparenode.
However, theappropriateproceduresmust befollowedandprecautionsmust be taken,inordernottointerruptI/Ooperationsandtoavoidcompromisingthe integrity ofyourdata.Theproceduresoutlinedinthistopicinvolvechangingthe worldwidenodename (WWNN)of aSANVolumeController.Theseprocedures must befollowedwithcareinordertoavoidduplicateWWPNswhichcan cause data corruption.
Be awarethatbyperformingtheseproceduresthefollowingchangeswillbemade to yourconfiguration:
Front PanelID
This numberwillchange.It isthenumberthatisprintedonthefrontofthe node andusedtoselect thenode thatisto beaddedtoa cluster.
Node Name
This numbermightchange.Ifyou donotspecifyaname,theSANVolume Controllerassignsadefaultname whenaddinga nodetoa cluster.The SANVolumeControllercreatesanew nameeachtime anodeisaddedto a cluster.Ifyouchoose toassignyourown namesthenyouneedto typein
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thenodename ontheAddinganode toaclusterpanel.Ifyou areusing scripts toperformmanagementtasksontheclusterandthosescriptsuse thenodename,thenbyassigningtheoriginalnameto areplacement node, youavoidtheneedto makechangestothescripts.
Node ID
This IDwillchange.Anewnode IDisassignedeach timeanodeisadded to acluster;thenodename remainsthesamefollowing serviceactivityon thecluster.Youcan usethenode IDorthenodenameto perform
management tasksonthecluster.However, ifyouareusingscriptsto performthosetasks, usethenode nameratherthanthenodeID.
Worldwide NodeName
This namewillchange.TheWWNNisused touniquelyidentifythenode andthefibre-channelports.TheWWNNof thesparenodewillchangeto thatof thefaultynode.Thenodereplacement proceduresmustbefollowed exactlytoavoidanyduplicationofWWNNs.
Worldwide PortNames
Thesenamesdonotchange.WWPNsarederivedfromtheWWNNthatis writtento thespare(replacement)node aspartof thisprocedure.For example,let’ssaytheWWNNforanode is50050768010000F6.Thefour WWPNsforthis nodewouldbederivedasfollows:
WWNN 50050768010000F6
WWNN displayed on front panel 000F6
WWPN Port 1 50050768014000F6
WWPN Port 2 50050768013000F6
WWPN Port 3 50050768011000F6
WWPN Port 4 50050768012000F6
Perform thefollowing stepsto replaceafaultynodeinthecluster:
1. VerifythenameandIDof thenode thatyouwishtoreplace.
PerformthefollowingstepstoverifythenameandID:
a. MakesurethattheSANVolumeControllerConsoleapplicationisrunning ontheclusterthatcontainsthefaultynode.
b. ClickWorkwithNodesintheportfolio.
c. ClickNodes.
Ifthenodeisfaulty,itwillbeshownasoffline.Ensure thepartnernodein theI/Ogroupisonline.
1) IftheothernodeintheI/Ogroup isoffline,startDirectedMaintenance Proceduresto determinethefault.
2) Ifyouhavebeen directedherebytheDMPs,andsubsequentlythe partnernodeintheI/Ogrouphasfailed,seetheprocedurefor RecoveringfromofflineVDisks.
Ifyouarereplacingthenode forotherreasons, determinethenodeyou wishtoreplaceandagainensurethepartner nodeintheI/Ogroup is online.
1) Ifthepartnernodeisoffline,youwillloseaccesstotheVDisksthat belongto thisI/Ogroupif youcontinue.StarttheDirectedMaintenance Proceduresandfixtheothernodebefore proceeding.
2. Findandrecordthefollowinginformationabout thefaultynode:
a. Nodename b. I/Ogroupname
c. Lastfivecharactersof theWWNN
d. FrontpanelID
e. Uninterruptiblepowersupplyserialnumber
a. Tofind andrecordthenodenameandI/Ogroup name,clickWorkwith Nodesintheportfolio.
b. ClickNodes.
Thefaultynodewillbeoffline.
c. Recordthefollowinginformationaboutthefaultynode:
v Nodename v I/Ogroupname
d. Tofind andrecordthelastfivecharactersof theWWNN,clickonthename oftheofflinenode.
e. ClicktheGeneraltab.
f. RecordthelastfivecharactersoftheWWNN.
g. Tofind andrecordthefrontpanelID,clicktheVital ProductDatatab.
h. Findthefront-panel-assemblysection ofthevitalproductdata (VPD).
i. RecordthefrontpanelID.
j. Tofind andrecordtheuninterruptiblepowersupplyserialnumber,clickthe VitalProductDatatab.
k. Findtheuninterruptiblepowersupply sectionoftheVPD.
l. Recordtheuninterruptiblepowersupplyserialnumber.
3. ObtaintheIDofthefaultynode.Disconnectallfourfibre-channelcablesfrom thenode.
Important:Donotplugthefibre-channelcablesintothespare nodeuntil sparenodehas beenconfiguredwiththeWWNNfromthefaultynode.
4. Connectthepowerandsignalcablesfromthesparenode tothe
uninterruptiblepowersupply thathas theserialnumberthatyounotedinstep 5l.
Note: Thesignalcablecanbepluggedintoanyvacantpositiononthetoprow of serialconnectors ontheuninterruptiblepowersupply.Ifnospare serialconnectorsareavailableontheuninterruptiblepowersupply, disconnectthecablesfromthefaultySANVolumeController.
5. Power-onthesparenode.
6. Displaythenodestatusontheservice panel.SeetheIBMTotalStorage SAN VolumeController:ServiceGuideformoreinformation.
7. ChangetheWWNNofthesparenode.
PerformthefollowingstepstochangetheWWNNofthespare nodesothatit matchestheWWNNofthefaultynode:
a. Withthenode statusdisplayedonthefrontpanel,pressandhold the Downbutton;pressandreleasetheSelectbutton;releasetheDown button.WWNNisdisplayedonline-1ofthedisplay;line-2of thedisplay containsthelastfive charactersoftheWWNN.
b. WiththeWWNNdisplayedontheservicepanel,pressandholdtheDown button,pressandreleasetheSelectbutton,releasetheDownbutton.This switchesthedisplayintoedit mode.Change thedisplayed numberto matchtheWWNNrecordedinstep5f.
Note: ToeditthedisplayednumberusetheUpandDownbuttonsto increaseordecreasethenumbers displayed.Usetheleft andright
buttonsto movebetweenfields.Whenthefivecharactersmatchthe numberrecordedinstep1,presstheselectbuttontwiceto accept thenumber.
8. Connectthefourfibre-channelcables thatweredisconnectedfromthefaulty nodetothespare node.
9. RemovethefaultynodefromtheclusterusingtheSANVolumeController Console.
Remember:Recordthefollowinginformation:
v Nodeserialnumber v WWNN
v AllWWPNs
v I/Ogroupthatcontainsthenode
Thiscanavoidapossibledatacorruptionexposurewhenthenodeisre-added tothecluster.
10. Addthespare nodetotheclusterusingtheSANVolumeControllerConsole.
11. UsetheSubsystemDeviceDriver(SDD)managementtool onthehost systemsto verifythatallpathsarenowonline.SeetheIBMTotalStorage SubsystemDeviceDriver:User’s Guideformoreinformation.
Attention: Whenthefaultynode isrepaireddonotconnectthefibre-channel cablestoit.Connectingthecables mightcausedatacorruption.
12. Repairthefaultynode.
13. Ifyouwanttousetherepairednodeasaspare node,performthefollowing steps:
a. Displaythenode statusonthefrontpaneldisplayof thenode. Seethe IBMTotalStorage SANVolumeController:ServiceGuidefor more information.
b. Withthenode statusdisplayedonthefrontpanel,pressandhold the Downbutton;pressandreleasetheSelect button;releasetheDown button.WWNNisdisplayedonline-1of thedisplay;line-2of thedisplay containsthelastfive charactersoftheWWNN.
c. WiththeWWNNdisplayed ontheservicepanel,pressandholdtheDown button,pressandreleasetheSelectbutton,releasetheDownbutton.This switchesthedisplayintoeditmode.Change thedisplayed numberto 00000.
Note: ToeditthedisplayednumberusetheUpandDownbuttons to increaseordecreasethenumbersdisplayed.Usetheleft andright buttonsto movebetweenfields.
ThisSANVolumeControllercannowbeusedasaspare node.
Attention: Neverconnecta SANVolumeControllerwithaWWNNof00000 tothecluster.If thisSANVolumeControllerisnolongerrequiredasaspare andisto beusedfornormalattachmentto aclusteryoumustfirst usethe proceduredescribedinthe″Prerequistes″ tochangetheWWNNtothenumber yourecordedwhenasparewascreated.Usinganyothernumbermightcause datacorruption.
Relatedtasks
“Deletinganodefromacluster”onpage155
Anodemightneedtobedeletedfromaclusterif thenodehasfailedandis beingreplaced witha newnodeor iftherepairthathasbeenperformed has causedthatnodeto beunrecognizable bythecluster.
“LaunchingtheSANVolumeControllerConsole”onpage114
YoucanlaunchtheSANVolumeControllerfromtheViewingClusterspanel.
“Replacinga faultynode intheclusterusingtheCLI”onpage 206
Youcanreplaceafaultynodeintheclusterusingthecommand-lineinterface (CLI).
Relatedinformation
“Advancedfunctionsoverviewfor theSANVolumeControllerConsole”onpage 137
Youcanperform″advanced″functionsusingtheSANVolumeController Console.