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A & E are correct.
VMFS can be deployed on three kinds of SCSI-based storage devices:
• Direct-attached storage
• Fibre Channel storage
• iSCSI storage
VMFS provides the SCSI access layer for virtual machines to efficiently read and write data on the underlying disk. It uses adaptive
block sizing for large I/Os, and subblock allocation for small files and directories. VMFS is rigorously tested and certified for a wide
range of Fibre Channel and iSCSI storage systems, and it is optimized to support large files while also performing many small
concurrent writes.
Fibre Channel (FC) – An ANSI-standard, gigabit-speed network technology used to build storage area networks and transmit data.
FC components include HBAs, switches, and cabling
In order for a filesystem to be made, the underlying storage must be block-based. VSAN and virtual volumes are object-based and NFS is file-based. Hence, A & E.
A&E
Optimizes Virtual Machine Access VMFS provides the SCSI access layer for virtual machines to efficiently read and write data on the underlying disk. It uses adaptive block sizing for large I/Os, and subblock allocation for small files and directories. VMFS is rigorously tested and certified for a wide range of Fibre Channel and iSCSI storage systems, and it is optimized to support large files while also performing many small concurrent writes.
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