6.3

Table Of Contents
VMware, Inc. 85
Glossary
SharedNothing
AkeyvCenterServerHeartbeatfeaturewherebyhardwareisnotsharedbetweenthePrimaryand
Secondaryservers,thuspreventingasinglepointoffailure.
SMTP
ATCP/IPprotocolusedinsendingandreceivingemailbetweenoramongservers.
SplitbrainAvoidance
AuniquefeatureofvCenterServerHeartbeatthatuses
variouscheckstoovercomeascenariowhereboth
PrimaryandSecondaryserversattempttobecomeactiveatthesametime,leadingtoanactiveactive
ratherthananactivepassivemodel.
SplitbrainSyndrome
AsituationwhereboththePrimaryandSecondaryserversinavCenterServerHeartbeatserverpairare
operating
intheactivemodeandattemptingtoserviceclients,causingdifferentdataupdatestobe
appliedindependentlytoeachserver.
SSL
(SecureSocketsLayer)establishesasecuresessionbyelectronicallyauthenticatingeachendofan
encryptedtransmission.
Subnet
Adivisionofanetworkintoaninterconnectedbutindependentsegmentordomain,to
improve
performanceandsecurity.
StorageAreaNetwork(SAN)
Ahighspeedspecialpurposenetworkor(subnetwork)thatinterconnectsdifferentkindsofdatastorage
deviceswithassociateddataserversonbehalfofalargernetworkofusers.
Switchover
Thegracefultransferofcontrolandapplicationservicetothepassiveserver.
Synchronize
Theinternalprocess
oftransporting64KBblocksofchangedfilesorregistrykeydata,throughthe
VMwareChannelfromtheactiveservertothepassiveserver.Thedataonthepassiveserverisamirror
imageoftheprotecteddataontheactiveserver,arequiredconditionfordatareplicationonavCenter
ServerHeartbeatserverpair.
SystemState
Datathatcomprisestheregistry,COM+ClassRegistrationdatabase,filesunderWindowsFileProtection,
andsystembootfile.Otherdatacanbeincludedinthesystemstatedata.
T Task
AnactionperformedbyvCenterServerHeartbeatwhendefinedconditionsaremet.
TimeToLive(TTL)
ThelengthoftimethatalocallycachedDNSresolutionisvalid.TheDNSservermustberequeriedafter
theTTLexpires.
Traceroute
AutilitythatrecordstheroutethroughtheInternetbetweenthecomputer
andaspecifieddestination
computer.
U Ungraceful(Unclean)Shutdown
AshutdownofvCenterServerHeartbeatresultingfromacriticalfailureorbyshuttingdownWindows
withoutfirstperformingapropershutdownofvCenterServerHeartbeat,resultinginpossibledataloss.