Xen devel - Oct 2003 - Problem with dissapearing files on virtual domain...

Hello, i''m creating a virtual domain with a seperate partition.
When i start the domain, ssh into it:


bash-2.05b# ssh 192.168.0.2
root@192.168.0.2''s password:
Last login: Fri Oct 31 17:43:12 2003 from 192.168.0.116
Linux 2.4.22-xeno.
root@xeno2:~#

that works,

then i create a directory :

root@xeno2:~# mkdir this_is_a_test_directory
root@xeno2:~# ls
loadlin16c.txt  loadlin16c.zip  this_is_a_test_directory/
root@xeno2:~#

then i do a sync:

root@xeno2:~# sync

and a ls again :

root@xeno2:~# ls
loadlin16c.txt  loadlin16c.zip
root@xeno2:~#


and my created dir is gone...

where do i look for an answer for this problem???

(which info do you need to help me out, and i''ll post it)

thanks in advance,

Robin




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> and my created dir is gone...
> 
> where do i look for an answer for this problem???
> 
> (which info do you need to help me out, and i''ll post it)
Perhaps you could send the output of ''df'', both from domain 0
and from
your new domain.

Is the filesystem shared with some other domain? It is not safe to
share a filesystem unless all sharing domains mount it read-only.

If this isn''t the problem, then is the filesystem on a ram disk? That
ought not to cause this problem though...

 -- Keir


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> my uneducated guess was that it was a problem with swap devices.
> my old setup was domain0 /dev/hda2 as a swap device,
> domain1 no swap device, but i tried domain1 /swapfile (150) mb file
> created with dd if=/dev/zero of=/swapfile, and mkswap /swapfile,
> sync, sync , swapon /swapfile  .... but that didn''t work either.
Have you granted domain 1 *write* access to hda5? To do this you pass
the ''-w'' flag to ''xenctl physical grant''.

I''d hope that Linux would compain loudly if you tried to mount a
read-write filesystem from a volume which it can''t write to. However,
I won''t be surprised if we haven''t got that quite right ---
I''d be
interested to know if this is the problem!

 -- Keir


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> > my uneducated guess was that it was a problem with swap devices.
> > my old setup was domain0 /dev/hda2 as a swap device,
> > domain1 no swap device, but i tried domain1 /swapfile (150) mb file
> > created with dd if=/dev/zero of=/swapfile, and mkswap /swapfile,
> > sync, sync , swapon /swapfile  .... but that didn''t work
either.
> 
> Have you granted domain 1 *write* access to hda5? To do this you pass
> the ''-w'' flag to ''xenctl physical
grant''.
> 
> I''d hope that Linux would compain loudly if you tried to mount a
> read-write filesystem from a volume which it can''t write to.
However,
> I won''t be surprised if we haven''t got that quite right
--- I''d be
> interested to know if this is the problem!
Okay, I''m now certain that this is your problem. Grant domain 1 access
using the -w flag and the file will not disappear!

Also, the latest check-in contains a fix to Xenolinux so that you
cannot mount a read-only partition for read-write access. Much saner
:-) 

Oh yeah: this is now the latest-semistable release. Please beat up on
it and let us know of any weirdnesses. It''s probably a good idea for
us to push out a proper 1.1 release before starting our next batch of
big hacks!

 -- Keir


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Thanks, this was indeed the solution for this problem.


Keir Fraser wrote:
>>>my uneducated guess was that it was a problem with swap devices.
>>>my old setup was domain0 /dev/hda2 as a swap device,
>>>domain1 no swap device, but i tried domain1 /swapfile (150) mb file
>>>created with dd if=/dev/zero of=/swapfile, and mkswap /swapfile,
>>>sync, sync , swapon /swapfile  .... but that didn''t work
either.
>>>      
>>>
>>Have you granted domain 1 *write* access to hda5? To do this you pass
>>the ''-w'' flag to ''xenctl physical
grant''.
>>
>>I''d hope that Linux would compain loudly if you tried to mount
a
>>read-write filesystem from a volume which it can''t write to.
However,
>>I won''t be surprised if we haven''t got that quite
right --- I''d be
>>interested to know if this is the problem!
>>    
>>
>
>Okay, I''m now certain that this is your problem. Grant domain 1
access
>using the -w flag and the file will not disappear!
>
>Also, the latest check-in contains a fix to Xenolinux so that you
>cannot mount a read-only partition for read-write access. Much saner
>:-) 
>
>Oh yeah: this is now the latest-semistable release. Please beat up on
>it and let us know of any weirdnesses. It''s probably a good idea
for
>us to push out a proper 1.1 release before starting our next batch of
>big hacks!
>
> -- Keir
>
>
>-------------------------------------------------------
>This SF.net email is sponsored by: SF.net Giveback Program.
>Does SourceForge.net help you be more productive?  Does it
>help you create better code?   SHARE THE LOVE, and help us help
>YOU!  Click Here: http://sourceforge.net/donate/
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>Xen-devel mailing list
>Xen-devel@lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/xen-devel
>  
>



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