Sun Microsystems Virtual Tape Library Manuel d'utilisateur Page 30

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16 VTL User Guide May 2008 G • 96267
Zoningforhighavailabilitysystems
Zoningahighavailabilitysystemisslightlymorecomplex thanzoningastandard
system,duetotheneedforredundant path sbetweeninitiatorsandtargets.Once
again,eachSANzonecanhaveonlyoneinitiatorandonetarget.Butthetotal
numberofzonesyouneeddependsonwhethertheSAN
issoftzoned(byWorld
WidePortName)orhardzoned(byportnumber). See:
“WWPNzoning(softzoning)”onpage 16
“Portzoning(hardzoning)” onpage 17.
WWPNzoning(softzoning)
AsoftzonedSANmapsinit ia tor totargetusingalogicalWorldWidePortName
(WWPN),ratherthanaphysicalhardwareaddress.Thisnametonamezoning
establishesalogicalroutethatmaytraversevaryingphysi cal portsandvarying
physical pathsthroughtheSAN.Toaccomplishfailover,wethusne edonly
asingle
zonefortheclientin it ia tor,theactiveVTL target,andthestandbyVTLtarget.
Seethefigurebelow
shows asoftzonedSANbeforeVTLfailover:
Duringfailover,thezonest il lcontainsonlyoneinitia torandonetargetatatime.But
thetargetWWPNisremapped fromaportonthefailedservernodetoaphysical
portonthestandbyserver.ThestandbyphysicalportspoofstheWWPNofthe
failedport,sozoning
doesnotchange.Thefigurebelowshowsa softzonedSAN
afterVTLfailover,withastandbyportspoofing theWWPNofthefailedport:
Zone A
T
I
I
Client A
Active VTL server node A
T
I
Standby VTL server node A
SAN
WWPN2
WWPN1
WWPN3
Zone B
I
Client B
WWPN5
WWPN4
WWPN6
Active VTL server node B
Standby VTL server node B
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