Re: [Xen-users] Lost images..

["Stephan Viljoen" <steph@xxxxxxxxx>]

Hi Ian,

Thanks for the reply. I've only started using Xend fairly recently so I'm a 
little green around the ears still. Anyway , here's an example of a running  
domain.

All my xend images are contained on a physical disk array so I'm  guessing this 
method right ? Also , what exactly should I be looking for?
---- If this were happening with normal processes (i.e. you've deleted a file 
which some process has open) then you'd be able to recover it via /proc/$PID/fd.


/dev/mapper/VolGroup-lv_home
                     1223067944 440676936 720262676  38% /xend/images

Also , here's an example of a running domain. 

/usr/lib/xen/bin/qemu-dm -d 4 -serial pty -domain-name test-01 -videoram 4 -k 
en-us -vnc 0.0.0.0:0 -vncunused -M xenpv

-steph




-----Original Message-----
From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxx] 
Sent: Thursday, June 26, 2014 2:58 PM
To: Stephan Viljoen
Cc: xen-users@xxxxxxxxxxxxx
Subject: Re: [Xen-users] Lost images..

On Thu, 2014-06-26 at 14:41 +0200, Stephan Viljoen wrote:
> I just made one hell of screw up by accidently deleting the wrong 
> folder containing all my xend domain images. Now the strange part is , 
> all those hosts are still alive and thankfully Iâm able to make 
> backups for the content so I was wondering whether thereâs a way to 
> somehow restore the images?

If this were happening with normal processes (i.e. you've deleted a file which 
some process has open) then you'd be able to recover it via /proc/$PID/fd.

So if the domains are using a userspace process as a disk backend (e.g.
tapdisk or qdisk) then you could probably apply that technique to the backend 
processes.

If the domains are using loop+blkback then I guess you might find the content 
in /dev/loop*.

If the domains are using just blkback directly then I think you might be stuck, 
or at least I don't know what to suggest. You said folder of images so I'm 
hopeful you don't fall into this case.

Ian.





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