Re: Remove scsi_wait_scan module

[James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>]

On Thu, 2012-05-31 at 09:45 -0700, Dan Williams wrote:
> On Thu, May 31, 2012 at 1:15 AM, Harald Hoyer <harald.hoyer@xxxxxxxxx> wrote:
> > For Fedora17 scsi_wait_scan is not used anymore in the normal initramfs. I
> > removed it and raid is only tried to be started in degraded mode after a timeout
> > (several udevadm settle waits plus some extra 10 seconds).
> 
> I'm probably missing something, but that sounds like "sprinkle
> timeouts until it magically works"?  If udevadm settle is being used
> as a discovery barrier shouldn't it be closing the loop with
> wait_for_device_probe() in the kernel?

No, that was pretty much the whole point of booting async.  It only
really matters in huge numbers of devices systems (like san connected
beasts).  What you *really* want is the boot to proceed immediately
after root appears and let the rest of the device probing continue in
parallel.

James


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