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16 VTL User Guide • May 2008 G • 96267

Zoningforhigh‐availabilitysystems

Zoningahigh‐availabilitysystemisslightlymorecomplex thanzoningastandard

system,duetotheneedforredundant path sbetweeninitiatorsandtargets.Once

again,eachSANzonecanhaveonlyoneinitiatorandonetarget.Butthetotal

numberofzonesyouneeddependsonwhethertheSAN

issoft‐zoned(byWorld

WidePortName)orhard‐zoned(byportnumber). See:

■ “WWPNzoning(softzoning)”onpage 16

■ “Portzoning(hardzoning)” onpage 17.

WWPNzoning(softzoning)

Asoft‐zonedSANmapsinit ia tor totargetusingalogicalWorldWidePortName

(WWPN),ratherthanaphysicalhardwareaddress.Thisname‐to‐namezoning

establishesalogicalroutethatmaytraversevaryingphysi cal portsandvarying

physical pathsthroughtheSAN.Toaccomplishfailover,wethusne edonly

asingle

zonefortheclientin it ia tor,theactiveVTL target,andthestandbyVTLtarget.

Seethefigurebelow

shows asoft‐zonedSANbeforeVTLfailover:

Duringfailover,thezonest il lcontainsonlyoneinitia torandonetargetatatime.But

thetargetWWPNisremapped fromaportonthefailedservernodetoaphysical 

portonthestandbyserver.ThestandbyphysicalportspoofstheWWPNofthe

failedport,sozoning

doesnotchange.Thefigurebelowshowsa soft‐zonedSAN 

afterVTLfailover,withastandbyportspoofing theWWPNofthefailedport:

Zone A

Client A

Active VTL server node A

Standby VTL server node A

SAN

WWPN2

WWPN1

WWPN3

Zone B

Client B

WWPN5

WWPN4

WWPN6

Active VTL server node B

Standby VTL server node B

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Sun Microsystems Virtual Tape Library Uživatelský manuál Strana 30