Subject: Re: RAID tuning
To: Manuel Bouyer <email@example.com>
From: Greg Oster <firstname.lastname@example.org>
Date: 12/19/2002 16:25:34
Manuel Bouyer writes:
> On Thu, Dec 19, 2002 at 03:20:02PM -0600, Greg Oster wrote:
> > [...]
> > Yes. Note that the queue type (and size) is not stored in the component
> > labels, so if you're using autoconfig, then it will automatically use fifo,
> > and you won't be able to change it. (yes, that's a bug, and yes, it's on my
> > TODO list, and no, there hasn't been a lot (read: any) demand to fix that
> > bug yet :-} )
> 'fifo 100'
> is lost at autoconfig ?
Not quite... only the "fifo" part is lost. The 100 part (or whatever you have
it set to) is still used. (Do a 'raidctl -s raid0' and look for "Queue size").
> This is unfortunate; with scsi disks doing tagged queuing you want much more
> than 100 concurent commands ...
> Would be nice if this was fixed ... and would be nice if raictl allowed to
> change it on the fly, without need to unconfig/config the RAID :)
> Manuel Bouyer <email@example.com>
> NetBSD: 23 ans d'experience feront toujours la difference