Re: swap on cgd: disklabel: disklabel write (sector 0) size 8192 failed: Read-only file system

[Jean-Yves Migeon <jeanyves.migeon%free.fr@localhost>]

On 18.04.2011 21:06, Hugo Silva wrote:
> On 04/18/11 19:39, Jean-Yves Migeon wrote:
>> On 18.04.2011 20:13, Hugo Silva wrote:
>>> Hello,
>>>
>>> Trying to setup swap on cgd on a 5.1/amd64 Xen domU (following
>>> http://www.netbsd.org/docs/misc/#cgd-swap); Here's what I get:
>>>
>>> # cat /etc/cgd/xbd1b
>>> algorithm aes-cbc;
>>> iv-method encblkno1;
>>> keylength 128;
>>> verify_method none;
>>> keygen randomkey;
>>>
>>> # cgdconfig cgd0 /dev/xbd1b /etc/cgd/xbd1b
>>> # disklabel -eI cgd0
>>> (change 4.2BSD to swap)
>>> disklabel: disklabel write (sector 0) size 8192 failed: Read-only file
>>> system
>>>
>>> in dmesg:
>>> cgd0: error 30 ("read-only filesystem")
>>>
>>> What's even stranger is that I can newfs cgd0a..
>>>
>>> Thoughts?
>>
>> Probably EROFS when trying to write to the sector that contains the
>> disklabel?
>>
>> What happens when you use "disklabel -W" ?
> 
> # disklabel -W cgd0
> # disklabel -e cgd0
> /tmp//EdDk.a04828a: 23 lines, 546 characters.
> disklabel: ioctl DIOCWDINFO: Read-only file system
> re-edit the label? [y]: n

Rather on xbd1. My guess is that cgd0 tries to overwrite the disklabel
of xbd1, hence the "EROFS" error. Could you give the output of
"disklabel /dev/xbd1d"?

-- 
Jean-Yves Migeon
jeanyves.migeon%free.fr@localhost