> The comment in the example config file next to that setting explains it more > fully, but something like 16 * number of drives is a reasonable setting for > readers. Writers should be a multiple of the number of cores.
In addition, if you're running on Linux in a situation where you're trying to saturate I/O capacity of an underlying device that is an SSD or a multi-device RAID, I *strongly* suggest switching Linux to the deadline or noop scheduler. The CFQ scheduler is very poor out-of-the-box for saturating your I/O subsystem with random reads, when using SSD:s or RAID controllers with multiple disks. -- / Peter Schuller
