Re: dkctl strategy

[mlelstv%serpens.de@localhost (Michael van Elst)]

joel.bertrand%systella.fr@localhost (=?UTF-8?Q?BERTRAND_Jo=c3=abl?=) writes:

>	Since I use NetBSD, I believed that disk strategies were persistent.
>Should I add these parameters in /etc/rc.local ?

Disk strategies are not persistent.

The default for real disk devices (sd, wd, ld, ...) is to
use the strategy with the highest priority of the loaded
modules:

fcfs      10
disksort  20
readprio  30
priocscan 40

So, with all strategies compiled into the kernel, that's prioscan.

Layered pseudo disks like ccd, cgd, fss and dk use "fcfs"
because the queue of lower drivers will reorder the requests
anyway.

The md driver uses "fcfs", sorting is useless for a RAM disk.

The vnd driver traditionally uses "disksort".

The dm driver (LVM) doesn't support a queue but passes
requests directly to the lower driver: