Udev should handle this automatically.  Like I said in the previous
note, however, it can take up to 10 seconds for the device node to
appear.  Race conditions of this type appear to be common during
rc.sysinit, and also affect fcp devices, particularly when you use them
in combination with LVM and/or multipath.  Red Hat supposedly has a fix
either available or coming soon.

-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of
Mark Post
Sent: Monday, July 02, 2007 2:54 PM
To: [email protected]
Subject: Re: [LINUX-390] vmcp during boot results in Error: Could not
open device /dev/vmcp: No such device


>>> On Mon, Jul 2, 2007 at  2:32 PM, in message
<[EMAIL PROTECTED]
rg>,
Susan Zimmerman <[EMAIL PROTECTED]> wrote: 
> Hi Mark.
> 
> I noticed /sys/class/misc/vmcp was 10 63
> 
> OSA-LNX1:~ # cat /sys/class/misc/vmcp/dev
> 10:63
> 
> So I deleted /dev/vmcp and manually created the node
> 
> as 10 63
> 
> and now it works just fine.

In addition to what Adam said about making sure to rebuild your initrd
and re-run zipl, be careful of what you've done here.  On one of my test
systems, the device node is 10:61, so it can vary from system to system.
If you rmmod the vmcp module, the device node _should_ go away.  When
you modprobe it again, it should appear dynamically.


Mark Post

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