On Friday, 06/13/2003 at 02:28 CET, David Goodenough
<[EMAIL PROTECTED]> wrote:
> This sounds a lot like the kind of processing that hotplug should do?
>
> David

In 2.5/2.6, things will change because of the generalized Linux support
for dynamic I/O config changes, with automatic execution of device
startup/cleanup scripts, etc.  (If that's what you mean by "hotplug"....
not sure what the official Linux name for this function is.)  But I think
you do not want automatic assignment of a drive that comes online
(attached, in VM terms).  That needs to wait until the drive is actually
needed.

The point is that assignment of a drive when it comes online or at driver
load time prevents any kind of multi-host sharing.  It's not a Linux
problem, per se, but a driver issue.

The real point of discussion is whether the mt, UTS or a combination
approach is best.  One of the advantages I see in the UTS approach is that
the driver can prevent access to the standard label, just as the dasd
drivers do for disks.

Alan Altmark
Sr. Software Engineer
IBM z/VM Development

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