Creating file-backed VBDs

This may seem like a stupid question but how does one go
about create
a VBD that can be used with the netbsd-INSTALL-XEN3_DOMU
kernels for
installation?

I have created a disk image with "dd if=/dev/zero
of=nbsd-disk bs=1k
seek=2048k count=1" and am able to start and enter the
NetBSD
installation program through the DOMU kernel, but when after
going
through the partition and disklabel steps, I get this error
as it
attempts to create the filesystem:

"disklabel: Can't read master boot record 0:
Input/output error"
"disklabel: /dev/rxbd0d: Input/output error"

My xen config file uses this line:
disk = [ 'file:/home/msun/nbsd-disk,0x1,w' ]

Do I need to fdisk the file disk image?  Or manually
disklabel and
create a filesystem on it?

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Hi

As I know netbsd vnd doesn't correctly support sparse files.
You have to use dd without seek parameter.


Regards
-
------------------------------------------------------------
---
Adam Hamsik
ICQ 249727910
jabber haadjabber.org
-
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---
There are 10 kinds of people in the world. Those who
understand
binary numbers, and those who don't.
				


Mike Sun wrote:
> This may seem like a stupid question but how does one
go about create
> a VBD that can be used with the
netbsd-INSTALL-XEN3_DOMU kernels for
> installation?
> 
> I have created a disk image with "dd if=/dev/zero
of=nbsd-disk bs=1k
> seek=2048k count=1" and am able to start and enter
the NetBSD
> installation program through the DOMU kernel, but when
after going
> through the partition and disklabel steps, I get this
error as it
> attempts to create the filesystem:
> 
> "disklabel: Can't read master boot record 0:
Input/output error"
> "disklabel: /dev/rxbd0d: Input/output error"
> 
> My xen config file uses this line:
> disk = [ 'file:/home/msun/nbsd-disk,0x1,w' ]
> 
> Do I need to fdisk the file disk image?  Or manually
disklabel and
> create a filesystem on it?
> 
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On Sun, 5 Nov 2006, Mike Sun wrote:
> I have created a disk image with "dd if=/dev/zero
of=nbsd-disk bs=1k
> seek=2048k count=1" and am able to start and enter
the NetBSD
...
> Do I need to fdisk the file disk image?  Or manually
disklabel and
> create a filesystem on it?

Does the same happen with a non-sparse file (i.e.: "dd
if=/dev/zero 
of=nbsd-disk bs=1m count=2000")?


  - Hubert

Thanks.  Looks like that did the trick.

On 11/5/06, Hubert Feyrer <hubertfeyrer.de> wrote:
> On Sun, 5 Nov 2006, Mike Sun wrote:
> > I have created a disk image with "dd
if=/dev/zero of=nbsd-disk bs=1k
> > seek=2048k count=1" and am able to start and
enter the NetBSD
> ...
> > Do I need to fdisk the file disk image?  Or
manually disklabel and
> > create a filesystem on it?
>
> Does the same happen with a non-sparse file (i.e.:
"dd if=/dev/zero
> of=nbsd-disk bs=1m count=2000")?
>
>
>   - Hubert

Hello all

What is the correct way to create vbd for netbsd 3 domU in
netbsd 3.0.1


Tried:
dd if=/dev/zero of=filesystem/nbsd-disk bs=1k count=1
newfs  -s 6136830 -F filesystem/nbsd-disk

after installation started and I have setup partion sizes
console says
Status: Finished
    Command: disklabel -w -r -f /tmp/disktab xbd0 'Xen
Virtual ESD'
     Hit enter to continue
------------------------------------------------------------
--------------------
disklabel: Invalid signature in mbr record 0

Status: Command failed
    Command: /sbin/newfs -O 1 -b 16384 -f 2048  /dev/rxbd0a
     Hit enter to continue
------------------------------------------------------------
--------------------
/dev/rxbd0a: 2496.0MB (5111808 sectors) block size 16384,
fragment size 2048
        using 14 cylinder groups of 178.30MB, 11411 blks,
22400 inodes.
wtfs: write error for sector 5111807: Input/output error

after that I cant continue. So What I am doing wrong.

domU config for disks says:

disk = [
'file:/xendoms/netbsdAntti/filesystem/nbsd-disk,0x1,w' ]
(tried with different ways)

-Anzi-


Mike Sun wrote:

> Thanks.  Looks like that did the trick.
>
> On 11/5/06, Hubert Feyrer <hubertfeyrer.de> wrote:
>
>> On Sun, 5 Nov 2006, Mike Sun wrote:
>> > I have created a disk image with "dd
if=/dev/zero of=nbsd-disk bs=1k
>> > seek=2048k count=1" and am able to start
and enter the NetBSD
>> ...
>> > Do I need to fdisk the file disk image?  Or
manually disklabel and
>> > create a filesystem on it?
>>
>> Does the same happen with a non-sparse file (i.e.:
"dd if=/dev/zero
>> of=nbsd-disk bs=1m count=2000")?
>>
>>
>>   - Hubert
>

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> Hello all
> 
> What is the correct way to create vbd for netbsd 3 domU
in netbsd 3.0.1
> 
> 
> Tried:
> dd if=/dev/zero of=filesystem/nbsd-disk bs=1k count=1
> newfs  -s 6136830 -F filesystem/nbsd-disk
> 
create file with if=/dev/zero of=filesystem/nbsd-disk
bs=1024k count=2048 and
then write this to your xen DOMU conf file

disk = ['file:filesystem/nbsd-disk,0,w]

then boot netbsd XENU install kernel ,and install system on
your vbd backed
disk.This works for me like a charm.
> after installation started and I have setup partion
sizes console says
> Status: Finished
>    Command: disklabel -w -r -f /tmp/disktab xbd0 'Xen
Virtual ESD'
>     Hit enter to continue
>
------------------------------------------------------------
--------------------
> 
> disklabel: Invalid signature in mbr record 0
> 
> Status: Command failed
>    Command: /sbin/newfs -O 1 -b 16384 -f 2048 
/dev/rxbd0a
>     Hit enter to continue
>
------------------------------------------------------------
--------------------
> 
> /dev/rxbd0a: 2496.0MB (5111808 sectors) block size
16384, fragment size
> 2048
>        using 14 cylinder groups of 178.30MB, 11411
blks, 22400 inodes.
> wtfs: write error for sector 5111807: Input/output
error
> 
> after that I cant continue. So What I am doing wrong.
> 
> domU config for disks says:
> 
> disk = [
'file:/xendoms/netbsdAntti/filesystem/nbsd-disk,0x1,w' ]
> (tried with different ways)
> 
> -Anzi-
> 
> 
> Mike Sun wrote:
> 
>> Thanks.  Looks like that did the trick.
>>
>> On 11/5/06, Hubert Feyrer <hubertfeyrer.de> wrote:
>>
>>> On Sun, 5 Nov 2006, Mike Sun wrote:
>>> > I have created a disk image with "dd
if=/dev/zero of=nbsd-disk bs=1k
>>> > seek=2048k count=1" and am able to
start and enter the NetBSD
>>> ...
>>> > Do I need to fdisk the file disk image? 
Or manually disklabel and
>>> > create a filesystem on it?
>>>
>>> Does the same happen with a non-sparse file
(i.e.: "dd if=/dev/zero
>>> of=nbsd-disk bs=1m count=2000")?
>>>
>>>
>>>   - Hubert
>>
> 
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haad wrote:

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>
>  
>
>>Hello all
>>
>>What is the correct way to create vbd for netbsd 3
domU in netbsd 3.0.1
>>
>>
>>Tried:
>>dd if=/dev/zero of=filesystem/nbsd-disk bs=1k
count=1
>>newfs  -s 6136830 -F filesystem/nbsd-disk
>>
>>    
>>
>create file with if=/dev/zero of=filesystem/nbsd-disk
bs=1024k count=2048 and
>then write this to your xen DOMU conf file
>
>disk = ['file:filesystem/nbsd-disk,0,w]
>
>then boot netbsd XENU install kernel ,and install system
on your vbd backed
>disk.This works for me like a charm.
>  
>

Yes it worked like a charm! Thanks, this was giving me a
headache!

-Anzi-