HP StorageWorks Clustered File System 3.6.1 for Windows installation guide (AP809-96008, October 2009)

Chapter2:ConfigurationInformation 6
NOTE: YoucanattachaclusterservertootherSANsthatarenotunder
HPClusteredFileSystemcontrol.TheseSANscanincludetape
drivesandnon‐PSFSfil esystems.YoucanuseWindowsutilitiesor
otherapplicationstoaccessthesedevicesandfilesystems.
Fencing Requirements
Whencertainproblemsoccuronaserver(forexample,hardware
problemsorthelossofclusternetworkcommunications),andtheserver
ceasestoeffectivelycoordinateandcommunicatewithotherserversin
thecluster,HPClusteredFileSystemmustfencetheserver,removingits
accesstofilesystemstopreservedataintegrity.There
aretwofencing
methods:fabric‐basedfencing,whichdisablestheserver’saccessinthe
FCfabric,andwebmanagement‐basedfencing,whicheitherresetsor
shutsdowntheserver.Whenselectingafencingmethod,youshouldbe
awareofthefollowing:
•IfyouwillbeusingtheFibreChannelVirtualInterconnectmodules
on
theHPC‐ClassBladeSystem,youmustconfigurewebmangement‐
basedfencing.Fabric‐basedfencingcannotbeusedwiththese
modules.
•IfyouwillbeusingIPMIinterfaceswithwebmangement‐based
fencing,youwillneedtochangethepasswordfromthefactory
default.Thefencingfeaturewillnot
workcorrectlyifthepasswordis
notchanged.
• ISCSIstoragemustusewebmanagement‐basedfencing.
•Whentheclusterisconfiguredforfabric‐basedfencing,arraysmust
operateinfabricorswitch‐attachedmode(notarbitrated‐loop‐only
devices).Thisrequirementdoesnotapplyfornon‐fabricfencing
configurations.
•Withfabric‐based
fencing,iftheserversareconnectedtoswitchesin
multiplefabrics,thephysicalportsoneachswitchmustbeassignedto
uniquedomainIDs.AdifferentdomainIDmustbeusedoneach
fabric(anygivendomainIDcanexistononlyonefabricintheSAN).
Forexample,if
aserverisconnectedtotwoswitchesthatarenotinthe
samefabric,switch1couldusedomainID6andswitch2coulduse