Trouble getting xbd devices to work

[Martin Husemann <martin%duskware.de@localhost>]

Hey folks,

I am trying to set a xen machine up and have some beginners trouble.
I followed the howto quite cloesly and can fire up domUs now.

I have:

xentools48-4.8.3nb4
xenkernel48-4.8.3

and NetBSD 8.99.24 (XEN3_DOM0) as dom0.

I tried two formats, one from the howto, another derived from the official
xen config dokumentation. They look like this:

disk = [ '/dev/wd0f,raw,0x1,rw',
         '/xen/NetBSD-8.0_STABLE-i386-install.img,,0x2,ro' ]

and

disk = [ 'phy:/dev/wd0g,0x1,w',
         'file:/xen/NetBSD-8.0_STABLE-amd64-install.img,0x2,r' ]

Both seem to work fine from the dom0's PoV:

[ 1956.2051930] xbd backend: attach device wd0f (size 209715200) for domain 1
[ 1956.2951925] xbd backend: attach device vnd0d (size 2662400) for domain 1

and

[ 4270.3217421] xbd backend: attach device wd0g (size 209715200) for domain 3
[ 4270.4517413] xbd backend: attach device vnd0d (size 2867200) for domain 3

Disklabel for wd0 shows:

 f: 209715200 1350570816     4.2BSD      0     0     0  # (Cyl. 1339852 - 1547902*)
 g: 209715200 1560286016     4.2BSD      0     0     0  # (Cyl. 1547902*- 1755953*)

and the files are there:

-rw-r--r--  1 root  wheel  1468006400 Aug 23 00:19 /xen/NetBSD-8.0_STABLE-amd64-install.img
-rw-r--r--  1 root  wheel  1363148800 Aug 23 02:20 /xen/NetBSD-8.0_STABLE-i386-install.img

But both domUs show:

[   2.0000246] xbd0d: error reading fsbn 0 (xbd0 bn 0; cn 0 tn 0 sn 0)
[   2.0000246] xbd0: dos partition I/O error
[   2.0200351] xbd1: dos partition I/O error
[   2.0200351] xbd1d: error reading fsbn 0 (xbd1 bn 0; cn 0 tn 0 sn 0)


I suppose I am doing something stupid?

Martin