Hardware-Assisted Locking; Thin Provisioning Space Reclamation - NEC M310 Configuration Manual

5. Functions <VAAI Support (3)>
n Hardware-Assisted Locking
1. Without Hardware-Assisted Locking
×
LOCK
n Thin Provisioning Space Reclamation
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.
1. VAAI Disabled
VM1
Mail
LINUX Windows
VMware ESX
Not freed
VM1 VM2
VMDK VMDK
VMFS-A
This example is with Storage vMotion. This function applies whenever removing/moving virtual
machines.
×
Lock entire LUN.
Lock conflict occurs
often.
VM2
Web
Move VM
Storage
vMotion
VM2
VMDK
VMFS-B
2. With Hardware-Assisted Locking
2. VAAI Enabled
VM1
Mail
LINUX
Freed
VM1
VMDK
VMFS-A
NEC Confidential
Lock at block level.
LOCK
Reduce lock conflicts
amongst servers.
VM2
Web
Windows
VMware ESX
Move VM
Storage
vMotion
Freed
Area
VMFS-B
VM2
VMDK
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