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  7. Cooperation with VMware Performance Improvement in virtualized server environments

Cooperation with VMware Performance Improvement in virtualized server environments

vStorage APIs for Array Integration (VAAI) is provided in "VMware vSphere" which enables platform virtualization. VAAI is an API which improves system performance and scalability by making effective use of the resources of disk storage systems. ETERNUS DX disk storage systems support the following functions of VAAI.

Full Copy: Replication of virtual machine/Copy for migration

Previously, it is required to copy data through a server for replication of virtual machine, data migration, etc. This function enables data copy within a disk storage system without going through the server. This reduces load on the server and improves system performance.

Block Zeroing: Zero out when allocating storage area in new virtual machine

When allocating storage area to create a new virtual machine, etc., it is necessary to zero out the storage area as initialization process. Previously, this process is performed at the server side. Performing this process at the disk storage system side instead reduces load on the server and speeds up capacity allocation of virtual machine.

Hardware Assisted Locking: Improved exclusion control

When writing to virtual server disk volumes the logical volume locking size in VMware vShere environments is large. This means subsequent writes to the same area have to wait for the first one to finish. By performing exclusion control at the ETERNUS storage level uses much smaller block unit sizes. This improves the operational efficiency of the overall virtual machine environment.

Thin Provisioning Space Reclamation - Release of unallocated areas

Unallocated areas created by file or virtual machine deletion can be released. They are released by issuing a UNMAP command or deleting a file on VMFS. They are not released by file deletion by the OS of a virtual machine.
A host notification function notifies the host when the number of primary allocated blocks reached its threshold value.


  • Significant reductions in server loads
  • Improved performance of the overall virtual environment


Supported Storage Disk Storage Systems ETERNUS DX60 S3
ETERNUS DX8700 S3/DX8900 S3
ETERNUS DX400/DX400 S2 series
ETERNUS DX8000/DX8000 S2 series
All Flash Arrays ETERNUS DX200F
Supported OS VMware vSphere 6.0 Standard
VMware vSphere 6.0 Enterprise
VMware vSphere 6.0 Enterprise Plus
VMware vSphere 5.5 Enterprise
VMware vSphere 5.5 Enterprise Plus
VMware vSphere 5.1 Enterprise
VMware vSphere 5.1 Enterprise Plus
VMware vSphere 5 Enterprise
VMware vSphere 5 Enterprise Plus
VMware vSphere 4.1 Enterprise
VMware vSphere 4.1 Enterprise Plus


ETERNUS VAAI Plug-in is required to use VAAI in any of the following environment:

  • When using vSphere 4.1.
  • When using ETERNUS DX400 series or ETERNUS DX8000 series. (including the case that ETERNUS DX S2 series is used with these models)
  • When using ETERNUS DX S2 series with firmware versions lower than V10L20.

For example, ETERNUS VAAI Plug-in is NOT required for VAAI support if only ETERNUS DX S2 series with firmware version V10L20 or later is used in vSphere 5 environment.