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portability is acceptable. Since the performance difference between pass- through and fixed-disks is minimal there should be very few scenarios where pass-through disks are required.

Disk Access Options Virtual machine guests can access storage by utilizing three mechanisms: IDE,

SCSI, and iSCSI. When configuring IDE or SCSI disks for a guest, you can choose either a VHD or pass-through disk configuration utilizing any storage connected to the host server (that is, disks direct attached to the host, SAN LUNs presented to the host, or iSCSI LUNs presented to the host).

While diagrammed separately, the various options can be combined and used together.

In each of the diagrams, the blue disks represent storage mounted by the host, which holds VHD files used by the guests. The orange disks represent storage accessed directly by the guests using either pass-through disks (using either IDE or SCSI virtual controllers) or directly connecting to iSCSI LUNs that is presented

to the guest.

In this diagram, direct attached storage such as SAS, SCSI, or SATA disks is utilized:

DAS Disk

VHD

SAS / SCSI / SATA

Pass-Through Disk

SAS / SCSI / SATA

DAS Disk

In this diagram, Fibre Channel SAN-based storage is utilized:

Note

Hyper-V guests can only boot from IDE disks. The Hyper-V guest BIOS

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