- Sun Storage Virtual Tape Library VTL User Guide

Key VTL features and options
96267 • G Chapter 1 Introduction: VTL appliances and enterprise data-protection 11
Storagepathfailover
InastandardavailabilityVTLsystem,thereisonelogicalpathfromaVTLclientto
VTLstorage,andeveryFibreChannelportiseitheratargetportforaVTLclientor
astoragefacinginitiator.Butin a highavailability system,therearetwopaths,a
primaryanda
secondaryorstandbypath,asshownbelow.
Fibre Channel path failover in high-availability VTL systems
Failoverduringreplication
Ifareplicationoperationisinprogres swhenfailoverorfailbackoccurs,replication
stops.Oncefailover/failbackhascompleted,replicationresumeswiththenext
normallyschedul ed operation.
Mirroringandfailover
Ifmirroringisinprogres s duringfailover/recovery,afterthefailover/recoverythe
mirroringwillrestartfromwhereitleftoff.
IfthemirrorissynchronizedbutFibre Cha nn e l connectivityislostbetweenthe
serverandstorage,them irrormaybecomeunsynchronized.Itwillresynchronize
automaticallyafterfailover/recovery.
Asynchronizedmirrorwillalways
remainsynchronizedduringarecoveryprocess.
Primary path from A
VTL client A
WWPN x1
Primary server for A
VTL client B
Primary path from B
WWPN y2
Primary server for B
Secondary server for B
Secondary server for A
Secondary path from A
Secondary path from B
WWPN x2
WWPN y1