Sun Microsystems Virtual Tape Library Manuel d'utilisateur Page 27

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Key VTL features and options
96267 • G Chapter 1 Introduction: VTL appliances and enterprise data-protection 13
AutoReplication
TheAuto Replicationoptioncopiesvirtualtapesfromavirtuallibraryto
anotherVTLserverwheneverabackupapplicationorutilitymovesavirtualtapeto
animport/exportslot.
YouenableAutoReplicationatthelibrarylevelwhenyoucreateavirtualtape
library(see“SettinguptheAutoReplicationoption”on
page 50).Youcanthe n
selectivelyenablethefeatureonatapebytapebasisastapesarecreated.Youcannot
altertheAutoReplicationstatusofan existingvirtualtape.
Replication
TheVTLReplicationfe ature maintainssynch ron ized replicaresourcecopiesof
virtualtapeson adesignatedVTLserver.Attheendofapolicydefinedreplica ti on
interval,VTLsoftwarecopiesdatathathaschangedandisnotcurrentlyinusefrom
theprimaryvirtualtapestothereplicaresources.
Duringnormaloperation,
backupclientshavenoaccesstoreplicaresources—the
latterarepurelyinternalprotectionswithintheVTLsy stem. Iftheprimaryvirtual
tapeiscorruptorotherwiseunusable,however,administratorscanpromotereplica
resourcesaspa rtoftheirdisasterrecoveryprocess.Oncepromoted,thereplica
resourcebecomestheprima ry virtualtape,
withthesamebarcodeandattributes.
Backupclientscanthususeitforrecoveryasifitwere,infact,theoriginalcopy.
Youcanconfigurethe VTLReplicationfeatureforeither:
RemoteReplicationor
LocalReplication.
RemoteReplication
RemoteReplicationmaintainssync hr oniz edcopiesofvirtualtapevolumesonthe
storagearraysofapairofVTLappliancesthatareconnectedacross Ethernet local
areanetworks(LANs)orWideAreaNetworks(WANs) .Dataisthustransferredat
LAN/WA Nspeed,butisnotsubjecttothedistancelimitationimposedbyFibre
Channelstorag eareanetwork(SAN)technology.
LocalReplication
LocalReplicationmaintainslocal,synchronizedcopiesofvirtualtapevolumeson
thestoragearraysofasingl eVTL appliance.Datais transferred atSANspeedover
distanceslimitedtothemaximumpossiblewith aFibreChannelSAN.
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