Hi, I'm going to install a WD Ultrastar DC HC550 18 TB in a desktop PC with Arch Linux and kernel 5.15.13. It will primarily store big HD video files (1080p/4K) and it will be used for streaming. In the FAQ the question on this topic (https://xfs.org/index.php/XFS_FAQ#Q:_Which_I.2FO_scheduler_for_XFS.3F) is not valid for recent versions of the Linux kernel: -------------------------------------------------------------------------------------- ..... Q: Which I/O scheduler for XFS? On rotational disks without hardware raid CFQ: not great for XFS parallelism .... deadline: good option, doesn't have such problem Note that some kernels have block multiqueue enabled which (currently - 08/2016) doesn't support I/O schedulers at all thus there is no optimisation and reordering IO for best seek order, so disable blk-mq for rotational disks (see CONFIG_SCSI_MQ_DEFAULT, CONFIG_DM_MQ_DEFAULT options and use_blk_mq parameter for scsi-mod/dm-mod kernel modules). .... -------------------------------------------------------------------------------------- Single-queue schedulers were removed from kernel since Linux 5.0. Which would be the best MQ I/O Scheduler to use: mq-deadline, bfq or none? Thanks in advance. Regards.
