NetBSD Problem Report #29856

From juan@xtraeme.nopcode.org  Fri Apr  1 10:01:11 2005
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Date: Fri,  1 Apr 2005 12:00:59 +0200 (CEST)
From: juan@xtraeme.nopcode.org
Reply-To: juan@xtraeme.nopcode.org
To: gnats-bugs@netbsd.org
Subject: Cannot add vnd files in domU when it's already running
X-Send-Pr-Version: 3.95

>Number:         29856
>Category:       port-xen
>Synopsis:       Cannot add vnd files in domU when it's already running
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bouyer
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 01 10:02:00 +0000 2005
>Closed-Date:    Wed Apr 20 18:26:23 +0000 2005
>Last-Modified:  Wed Apr 20 18:26:23 +0000 2005
>Originator:     Juan RP
>Release:        NetBSD 3.99.2
>Organization:
>Environment:
System: NetBSD Mandylion 3.99.2 NetBSD 3.99.2 (GATEWAY_) #1: Thu Mar 31 18:41:13 CEST 2005 juan@Nocturno:/home/juan/build/obj/sys/arch/i386/compile/GATEWAY_ i386
Architecture: i386
Machine: i386
>Description:

	When there's a domU running, you might want to add
	another vbd device, but it doesn't work:

	dom0:

	$ xm create /etc/xen/foo 
	$ dd if=/dev/zero of=mydisk.img count=512 bs=1m
	$ vnconfig vnd0 mydisk.img
	$ xm vbd-create nbsd1 phy:/dev/vnd0a wd1d w

	domU:

XenU# disklabel xbd1d
disklabel: Can't read master boot record 0: Input/output error
# /dev/rxbd1d:
type: ESDI
disk: Xen Virtual ESDI
label: default label
flags:
bytes/sector: 512
sectors/track: 2048
tracks/cylinder: 1
l.      0 -    781*)
 d:   1600000         0     4.2BSD      0     0     0  # (Cyl.      0 -    781*)
disklabel: boot block size 0
disklabel: super block size 0
disklabel: partitions a and d overlap
XenU#

	You cannot disklabel or newfs it, when the vnd files
	are specified in the config file and they are started
	at boot time, it works.

>How-To-Repeat:

	See above.
>Fix:
	As a workaround, specify the vnd files when the domU
	is created (at boot time), that way works.

>Release-Note:

>Audit-Trail:
From: Manuel Bouyer <bouyer@antioche.lip6.fr>
To: gnats-bugs@NetBSD.org
Cc: port-xen-maintainer@NetBSD.org, gnats-admin@NetBSD.org,
	netbsd-bugs@NetBSD.org
Subject: Re: port-xen/29856: Cannot add vnd files in domU when it's already running
Date: Fri, 1 Apr 2005 18:35:18 +0200

 On Fri, Apr 01, 2005 at 10:02:00AM +0000, juan@xtraeme.nopcode.org wrote:
 > >Number:         29856
 > >Category:       port-xen
 > >Synopsis:       Cannot add vnd files in domU when it's already running
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    port-xen-maintainer
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Fri Apr 01 10:02:00 +0000 2005
 > >Originator:     Juan RP
 > >Release:        NetBSD 3.99.2
 > >Organization:
 > >Environment:
 > System: NetBSD Mandylion 3.99.2 NetBSD 3.99.2 (GATEWAY_) #1: Thu Mar 31 18:41:13 CEST 2005 juan@Nocturno:/home/juan/build/obj/sys/arch/i386/compile/GATEWAY_ i386
 > Architecture: i386
 > Machine: i386
 > >Description:
 > 
 > 	When there's a domU running, you might want to add
 > 	another vbd device, but it doesn't work:
 > 
 > 	dom0:
 > 
 > 	$ xm create /etc/xen/foo 
 > 	$ dd if=/dev/zero of=mydisk.img count=512 bs=1m
 > 	$ vnconfig vnd0 mydisk.img
 > 	$ xm vbd-create nbsd1 phy:/dev/vnd0a wd1d w

 You should use vnd0d, not vnd0a. Either use the raw partition, or a partition
 not starting at offset 0. The first sectors of the vnd device are read-only
 for normal partitions, to protect the disklabel.

 -- 
 Manuel Bouyer <bouyer@antioche.eu.org>
      NetBSD: 26 ans d'experience feront toujours la difference
 --

From: Juan RP <juan@xtraeme.nopcode.org>
To: Manuel Bouyer <bouyer@antioche.lip6.fr>
Cc: gnats-bugs@NetBSD.org
Subject: Re: port-xen/29856: Cannot add vnd files in domU when it's already
 running
Date: Wed, 6 Apr 2005 18:52:14 +0200

 On Fri, 1 Apr 2005 18:35:18 +0200
 Manuel Bouyer <bouyer@antioche.lip6.fr> wrote:

 > > 	$ xm create /etc/xen/foo 
 > > 	$ dd if=/dev/zero of=mydisk.img count=512 bs=1m
 > > 	$ vnconfig vnd0 mydisk.img
 > > 	$ xm vbd-create nbsd1 phy:/dev/vnd0a wd1d w
 > 
 > You should use vnd0d, not vnd0a. Either use the raw partition, or a
 > partition not starting at offset 0. The first sectors of the vnd device are
 > read-only for normal partitions, to protect the disklabel.

 I tried with vnd0d, it failed. Which are the required steps to add a new vbd
 disk?

 Thanks.

From: Manuel Bouyer <bouyer@antioche.eu.org>
To: gnats-bugs@NetBSD.org
Cc: port-xen-maintainer@NetBSD.org, gnats-admin@NetBSD.org,
	netbsd-bugs@NetBSD.org
Subject: Re: port-xen/29856: Cannot add vnd files in domU when it's already running
Date: Wed, 6 Apr 2005 21:21:23 +0200

 On Wed, Apr 06, 2005 at 04:53:02PM +0000, Juan RP wrote:
 >  > > 	$ xm create /etc/xen/foo 
 >  > > 	$ dd if=/dev/zero of=mydisk.img count=512 bs=1m
 >  > > 	$ vnconfig vnd0 mydisk.img
 >  > > 	$ xm vbd-create nbsd1 phy:/dev/vnd0a wd1d w
 >  > 
 >  > You should use vnd0d, not vnd0a. Either use the raw partition, or a
 >  > partition not starting at offset 0. The first sectors of the vnd device are
 >  > read-only for normal partitions, to protect the disklabel.
 >  
 >  I tried with vnd0d, it failed. Which are the required steps to add a new vbd
 >  disk?

 Hum, it looks like it doesn't work as expected. It's properly created on
 the domain0 side, but the guest doesn't detect it. I suspect it's a problem
 in the xbd frontend.
 I have another PR to handle, which may help fixing this.

 -- 
 Manuel Bouyer <bouyer@antioche.eu.org>
      NetBSD: 26 ans d'experience feront toujours la difference
 --

Responsible-Changed-From-To: port-xen-maintainer->bouyer
Responsible-Changed-By: bouyer@netbsd.org
Responsible-Changed-When: Sun, 17 Apr 2005 23:00:53 +0000
Responsible-Changed-Why:
I commited support for dynamic attach/detach to xbd.


State-Changed-From-To: open->feedback
State-Changed-By: bouyer@netbsd.org
State-Changed-When: Sun, 17 Apr 2005 23:00:53 +0000
State-Changed-Why:
Hi,
Can you try the latest current ? I just commited code that makes dynamic
attach/detach work in xbd.


From: Juan RP <juan@xtrarom.org>
To: gnats-bugs@netbsd.org
Cc: bouyer@netbsd.org
Subject: Re: port-xen/29856: Cannot add vnd files in domU when it's already
Date: Wed, 20 Apr 2005 07:17:41 +0200

 I just tried to attach another xbd, and it worked fine, this PR can be
 closed now, thanks for your work.

State-Changed-From-To: feedback->closed
State-Changed-By: bouyer@netbsd.org
State-Changed-When: Wed, 20 Apr 2005 18:26:23 +0000
State-Changed-Why:
Juan confirmed that the problem is fixed.


>Unformatted:

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