Specifications

Administration Guide
110 VMware, Inc.
ESX!Server!can!use!disks!in!four!modes:
! Persistent!–!Disks!in!persistent!mode!behave!exactly!like!conventional!disk!drives!
on!a!computer.!All!writes!to!a!disk!in!persistent!mode!are!written!out!permanently!
to!the!disk!as!soon!as!the!guest!operating!system!writes!the!data.!
! Nonpersistent!–!All!changes!to!a!disk!in!nonpersistent!mode!are!discarded!when!
a!virtual!machine!session!is!powered!off.
! Undoable!–!Keep!or!discard!changes!you!made!during!a!working!session!when!
you!power!off!the!virtual!machine.!Until!you!decide,!the!changes!are!saved!in!a!
redo‐log!file.
! Append!–!Stores!changes!in!a!redo!log.!It!continually!adds!changes!to!the!redo!log!
until!you!remove!the!redo‐log!file!or!commit!the!changes!using!the!commit!
command!in!vmkfstools.!See!“Using!vmkfstools”!on!page 249.
To configure the virtual machine’s virtual disk
1In!the!Hardware!tab,!under!Virtual!Disk,!click!Edit.!
The!Virtual!
Disk!dialog!box!appears.
2Under!Disk!Mode,!click!Persistent, !Nonpersistent,!Undoable,!or!Append.