Re: hvm domus on netbsd-10 dom0 zvol

["Hauke Fath (SPG)" <hf%spg.tu-darmstadt.de@localhost>]

On 2024-07-11 15:30, Greg Troxel wrote:
> I am not understanding what you are doing.

Sorry.

netbsd-10 Dom0 running of a (ffs) raidframe mirror, trying to run DomUs 
off zvols on a separate zfs mirror.

Both DomU client systems appear to hang as soon as the kernel tries to 
access the filesystem on zvol.

> I am running multipe PV domUs.   Each has two logical disks.  From a
> config:
>
>    disk = [
>            'phy:/dev/zvol/dsk/tank0/vm/n9-amd64,0x0,w',
>            'phy:/dev/zvol/dsk/tank0/vm/n9-amd64.swap,0x1,w'
>            ]

Yeah well, PV. Mine are HVM, running off an rdsk zvol via vnd.

> I made the zvols via
>
>    zfs create -p -V 32G tank0/vm/n9-amd64
>    zfs create -p -V 8G tank0/vm/n9-amd64.swap

Roughly the same here...

> (and then did
>    newfs -O2 /dev/zvol/rdsk/tank0/vm/n9-amd64
> and rsynced an old laptop's filesystem, to it to a domU for package
> building, but that I think is not relevant.)

... then dd'ed images from working setups to the zvols.

Both image files (FreeBSD and Arch) are bootable as DomU both from ffs 
and zfs filesystems.

> What happens when you dd the zvol to /dev/null, in the dom0?

# dd if=/dev/zvol/rdsk/tank/arch-stick of=/dev/null bs=32k
655360+0 records in
655360+0 records out
21474836480 bytes transferred in 24.876 secs (863275304 bytes/sec)
#

> Any logs from dom0/xen?

# cat /var/log/xen/qemu-dm-arch-stick.log
char device redirected to /dev/pts/4 (label serial0)
VNC server running on 127.0.0.1:5901
qemu-system-i386: failed to create 'qdisk' device '768': no dev parameter
brconfig: bn1 is not a bridge
qemu-system-i386: network script /etc/pkg/xen/scripts/qemu-ifup failed 
with status 256
qemu-system-i386: terminating on signal 1 from pid 6700 (<unknown process>)
#

-- no idea what the brconfig(8) error is from, there is no 'bn1' 
anywhere. Same for the 'qdisk' eror - I found 
<http://mail-index.netbsd.org/port-xen/2021/01/17/msg009881.html>, but 
it was inconclusive.

Cheerio,
Hauke

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