Spectra T50e - Page 153

Chapter 5—Operating the Library Identifying Drives and Partitions in the Library
August 2017 User Guide—Spectra T50e Library
151
Drive World Wide Names
Aspartofprovidingnetworkconnectivity,thedrivesledfirmwareassigns
alocation‐basedWorldWideName(WWN)fortheFibreChannelorSAS
tapedriveithouses.ThisWWNisdisplayedontheDriveDetailsscreen
andcanbeusedbythehostsoftwaretoaddressthedrive.Becausethis
WWNislocation‐based,itremainsconstantevenifadriveisreplacedbya
differentoneofthesametype.Thenewdriveassumesthelocation‐based
BlueScaleidentifierandWWN.
Notes:  ThefourthdigitintheWWNindicatesthedrivebaywherethe
driveisinstalled.
 TheWWNforFibreChanneldrivesisactuallytheWWPNfor
PortAonthedriv e sled.Ifthedrivesledhastwoports,the
WWPNforportBisth esameastheoneforportAexceptthat
theseconddigitfromtheleftis2insteadof1.
 TheWWNforSAS driv esisactuallyth eSCSIportidentifier
forPortAonthedrivesled.LiketheFibreChannelWWN,this
identifierisassigned bythedevicemanufacturerand is
typically world‐wideunique.SASde vicesusetheseport
identifierstoaddresscommunic ation stoeachother.
Figure 93 The WWN assigned to a Fibre Channel drive (left) or a SAS tape drive (right).