Specifications

Administration Guide
302 VMware, Inc.
Using LUN Masking to Avoid Locking Issues
Locking!issues!are!likely!to!happen!on!a!SAN,!where!multiple!users!may!be!accessing!
some!of!the!same!disks!or!may!mistakenly!access!a!disk!assigned!to!another!user.!
It!is!helpful!to!use!LUN!masking!or!zoning!to!limit!which!disks!are!visible!to!each!server!
in!the!system
!and!reduce!the!ways!in!which!one!user!can!affect!another!user.!In!
particular,!the!use!of!LUN!masking!or!zoning!can!help!prevent!problems!such!as!those!
described!above!in!which!one!server!unexpectedly!locks!or!reserves!the!wrong!SCSI!
disk.
Network Load Balancing
Network!Load!Balancing!is!a!Windows!2000!Advanced!Server!feature.!By!using!
Network!Load!Balancing!to!build!a!server!cluster,!you!can!enhance!the!availability!of!
Internet!server!programs,!such!as!those!used!on!Web,!proxy,!domain!name!service!
(DNS),!FTP ,!virtual!private!network!(VPN),!and!streaming!media!servers.!Network!
Load
!Balancing!(NLB)!can!help!you!scale!your!server’s!performance.
NLB!can!be!used!in!unicast!or!multicast!modes.!If!the!is!cluster!operating!in!unicast!
mode!(the!default),!ordinary!network!communication!among!cluster!hosts!is!not!
possible!unless!each!cluster!host!has!at!least!two!network!adapters.
VMware!recommends!that!you!
use!multicast!mode,!because!unicast!mode!forces!the!
physical!switches!on!the!LAN!to!broadcast!all!NLB!cluster!traffic!to!every!machine!on!
the!LAN.
Creating Multinode Network Load Balancing Clusters on ESX
Server
This!section!covers!procedures!for!creating!a!Network!Load!Balancing!cluster!using!
nodes!running!in!virtual!machines.!These!virtual!machines!can!be!located!on!one!or!
more!ESX!Server!machines.
Creating the First Node’s Base Virtual Machine
To create a base virtual machine on the first node
1Access!the!VMware!Management!Interface!at!https://<hostname>/!and!log!on!
as!the!user!who!will!own!the!virtual!machine.
2Click!Add!Virtual!Machine.
N
OTE Set!the!vmkernel!configuration!option!NetNotifySwitch!to!0!when!using!unicast!
mode.!