5. Functions <VAAI Support (3)>
n
Hardware-Assisted Locking
1. Without Hardware-Assisted Locking
LOCK
2. With Hardware-Assisted Locking
Lock entire LUN.
Lock conflict occurs
often.
LOCK
×
×
n
Thin Provisioning Space Reclamation
This example is with Storage vMotion. This function applies whenever removing/moving virtual
machines.
1. VAAI Disabled
VM1
VMDK
VMFS-A
VM2
VMDK
VM2
VMDK
VMware ESX
LINUX
Windows
Web
VM1
VM2
VMware ESX
LINUX
Windows
Web
VM1
VM2
2. VAAI Enabled
VMFS-B
Storage
vMotion
VM1
VMDK
VMFS-A
Freed
Area
VM2
VMDK
VMFS-B
Storage
vMotion
Move VM
Move VM
Not freed
Freed
This function enables ESX Server to monitor the space usage by virtual machines while
synchronizing with storage with thin provisioning. Previously when moving virtual machines, disk
space for virtual machines could not be freed. With the VAAI function, the disk space can be freed.
This makes it easier to operate/manage virtual machines in a thin provisioning environment.
Lock at block level.
Reduce lock conflicts
amongst servers.
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NEC Confidential