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Silver Member | Редактировать | Профиль | Сообщение | Цитировать | Сообщить модератору Hardware Acceleration for Block Storage Devices With hardware acceleration, your host can integrate with block storage devices, Fibre Channel or iSCSI, and use certain storage array operations. ESXi hardware acceleration supports the following array operations: - Full copy, also called clone blocks or copy offload. Enables the storage arrays to make full copies of data within the array without having the host read and write the data. This operation reduces the time and network load when cloning virtual machines, provisioning from a template, or migrating with vMotion. - Block zeroing, also called write same. Enables storage arrays to zero out a large number of blocks to provide newly allocated storage, free of previously written data. This operation reduces the time and network load when creating virtual machines and formatting virtual disks. - Hardware assisted locking, also called atomic test and set (ATS). Supports discrete virtual machine locking without use of SCSI reservations. This operation allows disk locking per sector, instead of the entire LUN as with SCSI reservations. Check with your vendor for the hardware acceleration support. Certain storage arrays require that you activate the support on the storage side Managing Hardware Acceleration on Block Storage Devices To integrate with the block storage arrays and to benefit from the array hardware operations, vSphere uses the ESXi extensions referred to as Storage APIs - Array Integration, formerly called VAAI. In the vSphere 5.0 release, these extensions are implemented as the T10 SCSI based commands. As a result, with the devices that support the T10 SCSI standard, your ESXi host can communicate directly and does not require the VAAI plug-ins. If the device does not support T10 SCSI or provides partial support, ESXi reverts to using the VAAI plug-ins, installed on your host, or uses a combination of the T10 SCSI commands and plug-ins. The VAAI plug-ins are vendor-specific and can be either VMware or partner developed. To manage the VAAI capable device, your host attaches the VAAI filter and vendor-specific VAAI plug-in to the device. For information about whether your storage requires VAAI plug-ins or supports hardware acceleration through T10 SCSI commands, see the vSphere Compatibility Guide or check with your storage vendor. |