can't LINK the real dasd address as a virtual address; you can LINK to MDISKs 
(try HELP CP LINK); see my 2nd linux-390 reply to your post; 
RE-LINK isn't needed after re-boot; 
Can't do the guest's LINK from userid MAINT unless you use secuser/SCIF or 
other methods, for starters enter the LINK command from the guest's VM console 
using #CP LINK ... 
The #CP is needed so so z/VM's CP sees and acts on the command and not linux; 
think of #CP as an escape sequence.
good luck



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-----Original Message-----

From: The IBM z/VM Operating System on behalf of Martin, Terry R. (CMS/CTR) 
(CTR)
Sent: Sat 5/31/2008 11:56 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Presenting Additional ECKD devices to Linux Guest Dynamically
 
Hi Alan,

Thanks for the info. One other question. Can I LINK the real DASD device
address AS a virtual address? LINK * 513D 800. I asked this because up
to this point I have presented the DASD to the Linux guest via the USER
DIRECTORY entry as VIRTUAL addresses so I would like to stay consistent
when I LINK them dynamically while the guest is active.

If the guest is re-booted will the LINKED DASD is be there after the
re-boot or would I need to re-LINK?

Does it matter whether I issue the LINK via the MAINT user or does it
have to be done from the guest itself?

This is my first attempt at z/VM and z/Linux so if the questions sound
elementary until I sort this all out, I apologize.  

Thanks, Terry

-----Original Message-----
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Alan Ackerman
Sent: Saturday, May 31, 2008 10:00 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Presenting Additional ECKD devices to Linux Guest
Dynamically

On Sat, 31 May 2008 15:29:56 -0400, Martin, Terry R. (CMS/CTR) (CTR) 
<[EMAIL PROTECTED]> wrote:

>Hi
>
> 
>
>I am running z/VM 5.3 with a RedHat 4.6 z/Linux (Kernel level 2.6.9-67)
>guest. I need to give this guest some more ECKD DASD. I want to do this
>dynamically. As far as I knew to accomplish this I should only need to
>add the devices to the User Directory bring that new Directory online
>(DIRECTXA USER). At this point on the Linux side they need to do some
>things to see the new device. 

Updating the directory for a virtual machine has no effect on the
virtual=
 machine, until the virtual 
machine is next logged on. For a virtual machine that is already logged
o=
n, you will have to log off 
and log back on again.

If you want the virtual machine to stay logged on, you can either ATTACH
=
the device to the virtual 
machine, or ATTACH it to SYSTEM and then LINK to it from the virtual
mach=
ine.

Alan Ackerman
Alan (dot) Ackerman (at) Bank of America (dot) com

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