Thanks Bob! That gives me a little more to play with. I'm being told by our VM
folks that they would prefer I not do virtual devices shenaningans, but
we'll see.
"Nix, Robert P." <[EMAIL PROTECTED]>
Sent by: Linux on 390 Port
<[email protected]>
To
[email protected]
cc
03/03/2006 10:03 AM
Subject
Re:
Passing a parameter to a linux guest at IPL time
Please respond to
Linux on 390 Port <[email protected]>
Note that the lsdasd command only exists in SLES 9 as well; You'd have to grep
/proc/dasd/devices in SLES 8 to find the trigger device, although that
wouldn't be difficult to do. The vmcp command also exists only in SLES 9.
--
Robert P. Nix Mayo Foundation
RO-OC-1-13 200 First Street SW
507-284-0844 Rochester, MN 55905
-----
"In theory, theory and practice are the same, but
in practice, theory and practice are different."
-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Hayden
Sent: Thursday, March 02, 2006 8:58 PM
To: [email protected]
Subject: Re: Passing a parameter to a linux guest at IPL time
Since you're running under VM, you could read a file from a CMS
minidisk using the cmsfs program, or play some tricks using virtual
devices. For instance, your boot process could check to see if a
device exists at a certain virtual address, and if so, don't start
WebSphere. An easy device to create is a virtual printer, as in CP
DEF PRT AS 9999. Then, see if it exists using hcp q v 9999 (or the
vmcp command). If you don't want to depend on the hcp command, define
a 1 cyl tdisk and check to see if it appears in /proc/dasd/devices or
in the output of the lsdasd command (assuming it is a dasd address
defined to the kernel.) If you want to pass a string using a device,
define a printer and put some data in the tag area (up to 136
characters) for the device. You'd have to read that data using the
hcp command.
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