Re: [PATCH] revert async probing of VMBus scsi device

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed, 5 Jun 2019 12:26:47 -0700
Christoph Hellwig <hch@infradead.org> wrote:

> On Wed, Jun 05, 2019 at 12:10:20PM -0700, Stephen Hemminger wrote:
> > > Sure.  But they should not get a way out for just one specific driver.  
> > 
> > There are people running new kernels on 6 year old distributions.
> > Was every distribution smart enough then? If you think so, then
> > this not necessary.  
> 
> I think you are missing my point.  If we want a way to disable this,
> we:
> 
>  a) want it opt-in
>  b) it needs to for the whole SCSI layer and not just one driver

There is some possible issues with how initial images are deployed
with temporary disks.  The temp disks come pre-formatted with a blank
NTFS and cloudinit reformats them to ext4 the first time.

Not sure if ordering matters, or if cloudinit is smart enough to do
the right thing. I am trying to get an answer.

It might just be that the first boot should turn off async probing
for the whole scsi layer via kernel cmdline. Or it might not be an issue
if cloudinit was written by developers smart enough to handle moving
disks.