Re: [Xen-devel] A snapshot is not (really) a cow

[Peri Hankey <mpah@xxxxxxxxxxxxxx>]

I rebuilt with todays xen-2.0-src:

... untar and rename todays download ...
make mrproper
make world
su
make install
reboot

The first few lines in /var/log/messages show that something is 
immediately trying to use nbd devices, way before any service in 
/etc/init.d/ can get a sniff at it.
I think nbd used to be a module the xen0 config, but I see it's now 
compiled into the kernel - could there be a device number confusion 
somewhere? According to devices.txt network block devices have block 
major 43.
---- start of boot sequence in /var/log/messages ----
---- I don't know where 'or 0'  comes from ------------
Sep 27 08:23:29 a4 syslogd 1.4.1: restart.
Sep 27 08:23:29 a4 kernel: klogd 1.4.1, log source = /proc/kmsg started.
Sep 27 08:23:29 a4 kernel: Inspecting /boot/System.map-2.6.8.1-xen0
Sep 27 08:23:29 a4 partmon: Checking if partitions have enough free 
diskspace:
Sep 27 08:23:30 a4 kernel: Loaded 19997 symbols from 
/boot/System.map-2.6.8.1-xen0.
Sep 27 08:23:30 a4 kernel: Symbols match kernel version 2.6.8.
Sep 27 08:23:30 a4 kernel: No module symbols loaded - kernel modules not 
enabled.
Sep 27 08:23:30 a4 kernel: or 0
Sep 27 08:23:30 a4 kernel: nbd60: Request when not-ready
Sep 27 08:23:30 a4 kernel: end_request: I/O error, dev nbd60, sector 0
Sep 27 08:23:30 a4 kernel: nbd61: Request when not-ready
Sep 27 08:23:30 a4 kernel: end_request: I/O error, dev nbd61, sector 0
...
------------------------------------------------------------------------------------

Thanks
Peri

Ian Pratt wrote:

> > I'm not aware of anything that is trying to use NBD - I did experiment a 
> > bit a while back, but didn't  get anywhere. I thought xen might be using 
> > it behind the scenes in some way.
> >    
> Xen doesn't use nbd.  I bet you have something in
> /etc/rc.d/init.d that is starting nbd.
>
> Ian
>
>
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