Storage · VAAI

VAAI Support for IBM Storwize V7000 ( FC )

Hier nun die Antwort auf die nächste Frage, ob IBM VAAI mit ihrem Storage Storwize V7000 unterstützt.

Die Antwort ist ja, seit dem Release ESX 4.1. Im nachfolgenden finden Sie eine Zusammenfassung der Informationen von VMware und auch IBM.

Storage API for Array Integration ( VAAI )

Storage API for Array Integration (VAAI). Sie können für VAAI zertifizierte Speicher-Arrays nur mit den Editionen VMware vSphere Enterprise oder Enterprise Plus verwenden.

VAAI suppport since vSphere 4.1 release.

VAAI uses these fundamental operations:

  • Atomic Test & Set (ATS), which is used during creation and locking of files on the VMFS volume
  • Clone Blocks/Full Copy/XCOPY, which is used to copy or migrate data within the same physical array
  • Zero Blocks/Write Same, which is used to zero-out disk regions
  • Thin Provisioning in ESXi 5.x and later hosts, which allows the ESXi host to tell the array when the space previously occupied by a virtual machine (whether it is deleted or migrated to another datastore) can be reclaimed on thin provisioned LUNs.
  • Block Delete in ESXi 5.x and later hosts, which allows for space to be reclaimed using the SCSI UNMAP feature. For more information on Block Delete/SCSI UNMAP, see Using vmkfstools to reclaim VMFS deleted blocks on thin-provisioned LUNs (2014849).


vStorage APIs for Array Integration is a feature introduced in ESXi/ESX 4.1 that provides hardware acceleration functionality. It enables your host to offload specific virtual machine and storage management operations to compliant storage hardware. With the storage hardware assistance, your host performs these operations faster and consumes less CPU, memory, and storage fabric bandwidth.

For more information about vStorage APIs for Array Integration and when it is used, see the Storage Hardware Acceleration section in the Configuration Guide for your version of ESXi/ESX.

What does VAAI require?

VAAI requires:

  • ESXi/ESX 4.1 or later
  • Standard, Enterprise, Enterprise Plus or Remote Office Branch Office licensing for ESXi/ESX hosts
  • Storage arrays that support VAAI storage-based hardware acceleration
  • Notes:
    • ESXi/ESX 4.1 does not support hardware acceleration with NAS storage devices.
    • Support for NAS storage devices was introduced in ESXi 5.x.

How do I know if my storage array supports VAAI?

To determine if your storage array supports VAAI, see the Hardware Compatibility List or consult your storage vendor. To enable the hardware acceleration on the storage array, check with your storage vendor. Some storage arrays require explicit activation of hardware acceleration support.


  • In VMware HCL version 2, there are options under the Features Category and Features fields where arrays can be searched against to verify if they are VAAI-certified.

Verwenden Sie bitte den Link oben zum Aufrufen des VMware Compability Guides und wählen Sie die entsprechende Category ( Storage/SAN ) im Feld „What are you looking for:“ aus:

IBM Storwize V7000 and SVC

VMware vStorage API for Array Integration (VAAI) VMware virtual environments can be improved with Storwize V7000 by using VAAI. This new API delegates certain VMware functions to Storwize V7000 to enhance performance. In the vSphere 4.1 release, this offload capability to Storwize V7000 supports: • Full copy: Enables the Storwize V7000 to make full copies of data without requiring the ESX server to read and write the data • Block zeroing: Enables Storwize V7000 to zero out large numbers of blocks, shortening the time needed to provision virtual machines • Hardware-assisted locking: Improves the scalability of large ESX server farms sharing volumes on the Storwize V7000 by providing an alternate means to protect the metadata for VMFS cluster-file systems

VMware Compability Guide IBM V7000

External KB article


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