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Allocation flags with fixed extent size

The VX_ALIGN flag can be used to specify an allocation flag for fixed extent size. This flag has no effect if it is specified with a reservation request. The VX_ALIGN specifies the alignment requirement for allocating future extents aligned on a fixed extent size boundary relative to the start of the allocation unit. This can be used to align extents to disk striping boundaries or physical disk boundaries. The VX_ALIGN flag is persistent and is returned by the VX_GETEXT ioctl.