BLK_LIMITS_IO_OPT(9) Block Devices BLK_LIMITS_IO_OPT(9)

NAME blk_limits_io_opt - set optimal request size for a device

SYNOPSIS void blk_limits_io_opt(struct queue_limits * limits, unsigned int opt);

ARGUMENTS limits the queue limits

opt smallest I/O 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.