centos man page for blk_queue_io_opt

BLK_QUEUE_IO_OPT(9)						   Block Devices					       BLK_QUEUE_IO_OPT(9)

NAME
       blk_queue_io_opt - set optimal request size for the queue

SYNOPSIS
       void blk_queue_io_opt(struct request_queue * q, unsigned int opt);

ARGUMENTS
       q
	   the request queue for the device

       opt
	   optimal request size in bytes

DESCRIPTION
       Storage devices may report an optimal I/O size, which is the device's preferred unit for sustained I/O. This is rarely reported for disk
       drives. For RAID arrays it is usually the stripe width or the internal track size. A properly aligned multiple of optimal_io_size is the
       preferred request size for workloads where sustained throughput is desired.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						       BLK_QUEUE_IO_OPT(9)