Block Size

Question 1

Default data transfer size of a Qlogic HBA driver?

Answer 1

default size of 512KB.

Question 2

Default data transfer size of most storage controllers?

Answer 2

default block size of 64KB or 128KB.
ie storage controller with 64KB block sizebuffers 512KB block from host HBA, hen segments into 8 64KB blocks, which are then writen to disk,
the storage controller with 128KB block size, would buffer the 512KB block from host HBA, then segment it into 4 128KB blocks, then write them to disk

Question 3

One of the most important storage network tuning parameters is

Answer 3

data transfer size