hesela.devStripe unit
A stripe unit is the contiguous portion of a stripe placed on one storage member.
Unit: A strip or stripe element is one member's portion, not the complete stripe. Its byte length is often called chunk size or strip size. In the SNIA dictionary, stripe depth counts blocks within that portion, not the number of array members. [1] [2] [3]
Payload: With N equal-sized active members and c bytes per unit, full-stripe user data is N x c for RAID 0, (N - 1) x c for RAID 5 and (N - 2) x c for conventional RAID 6. For four members and 512 KiB units, these are 2 MiB, 1.5 MiB and 1 MiB. The latter two exclude parity, while total occupied space across members is 2 MiB in each case. [3] [4]
Alignment: In that RAID 5 example, a 1.5 MiB request beginning 4 KiB past a data-stripe boundary covers parts of two stripes. Matching the payload length does not alone provide a full-stripe write. The parity layer may combine separate requests before writing complete stripes. [5]