Damien Le Moal <damien.lemoal@xxxxxxx> writes: > Single LUN multi-actuator hard-disks are cappable to seek and execute > multiple commands in parallel. This capability is exposed to the host > using the Concurrent Positioning Ranges VPD page (SCSI) and Log (ATA). > Each positioning range describes the contiguous set of LBAs that an > actuator serves. Are these ranges exlusive to each actuator or can they overlap? > This series does not attempt in any way to optimize accesses to > multi-actuator devices (e.g. block IO schedulers or filesystems). This > initial support only exposes the independent access ranges information > to user space through sysfs. Is the plan to eventually change the IO scheduler to maintain two different queues, one for each actuator, and send down commands for two different IO streams that the elevator attempts to keep sequential?
