Specify the stripe unit and width for a RAID device or a stripe volume.
Values must be specified in 512-byte block units.
For example, to use a stripe unit of 1MB and a stripe width of 8MB:
mount -o sunit=2048,swidth=16384 devicemountpoint
swalloc mount option
data allocations will be rounded up to stripe width boundaries when the current end of file is being extended and the file size is larger than the stripe width size.
