[Xen-users] Mounting Xen LVM Guests

[Eredicator X <eredicatorx@xxxxxxxxxxxxxxx>]

I want to be able to mount LVM partitions that are xen guests when shut down of 
course. 

The reason I can't is cause I am not doing it right. :( I just do not know 
where I am going wrong. 

I start by creating the logical volume 

#lvcreate --size 10g --name test01.max /dev/xen-system 
#Logical volume "test01.max" created 


Install to the new logical volume 

#root@max02:/home/virt# virt-install 
#Would you like a fully virtualized guest (yes or no)? This will allow you to 
run unmodified operating systems. yes 
#What is the name of your virtual machine? test01.max 
#How much RAM should be allocated (in megabytes)? 1000 
#What would you like to use as the disk (file path)? /dev/xen-system/test01.max 
#Would you like to enable graphics support? (yes or no) yes 
#What is the virtual CD image, CD device or install location? 
/export/home0/erin/ISO/CentOS-5.2-x86_64-netinstall.iso 

Finish install 

#Guest installation complete... restarting guest. 

Shut down new guest 

#root@max02:/etc/xen# xm shutdown test01.max 

Then try to mount the lvm I found a number of tutorials on how to do this like 
this; 
http://linuxwave.blogspot.com/2008/02/accessing-data-on-xen-lvm-guest-image.html
 

I tried to stick with the manual from Red Hat and that did not work either; 
http://www.centos.org/docs/5/html/Virtualization-en-US/ch-virt-accessing-data.html
 despite the 2 typos. 


#root@max02:~# cd /dev/xen-system/
#root@max02:/dev/xen-system# ls -l 
#total 0
#lrwxrwxrwx 1 root root 34 Jan  7 15:25 test01.max -> 
/dev/mapper/xen--system-test01.max
#
#root@max02:/dev/xen-system# fdisk -lu test01.max 
#
#Disk test01.max: 10.7 GB, 10737418240 bytes
#255 heads, 63 sectors/track, 1305 cylinders, total 20971520 sectors
#Units = sectors of 1 * 512 = 512 bytes
#
#     Device Boot      Start         End      Blocks   Id  System
#test01.max1   *          63      208844      104391   83  Linux
#test01.max2          208845    20964824    10377990   8e  Linux LVM
#root@max02:/dev/xen-system# vgscan 
#  Reading all physical volumes.  This may take a while...
#  Found volume group "xen-system" using metadata type lvm2
#  Found volume group "VolGroup00" using metadata type lvm2
#root@max02:/dev/xen-system# vgchange -ay xen-system 
#  6 logical volume(s) in volume group "xen-system" now active
#root@max02:/dev/xen-system# lvs 
#  LV         VG         Attr   LSize   Origin Snap%  Move Log Copy%  Convert
#  LogVol00   VolGroup00 -wi-ao 929.47G                                      
#  LogVol01   VolGroup00 -wi-ao   1.94G                                      
#  test01.max xen-system -wi-a-  10.00G                                      


This is the part I do not understand what am I supposed to be mounting .... 
I think the first one should work. But I did not create a file system on 
/dev/xen-system/test01.max I just installed to it. 
I have tried creating a ext3 file system under and then installing to that but 
was still not able to mount the instance. (Which makes sense to me at least.)

#root@max02:/dev/xen-system# mount /dev/xen-system/test01.max /mnt 
#mount: you must specify the filesystem type

#root@max02:/dev/xen-system# mount -t ext3 /dev/xen-system/test01.max /mnt 
#mount: wrong fs type, bad option, bad superblock on /dev/xen-system/test01.max,
#       missing codepage or other error
#       In some cases useful info is found in syslog - try
#       dmesg | tail  or so

#root@max02:/dev/xen-system# dmesg | tail 
#device vif1.0 entered promiscuous mode
#ADDRCONF(NETDEV_UP): vif1.0: link is not ready
#tun: Universal TUN/TAP device driver, 1.6
#tun: (C) 1999-2004 Max Krasnyansky <maxk@xxxxxxxxxxxx>
#device tap0 entered promiscuous mode
#xenbr0: topology change detected, propagating
#xenbr0: port 4(tap0) entering forwarding state
#tap0: no IPv6 routers present
#hfs: unable to find HFS+ superblock
#VFS: Can't find ext3 filesystem on dev dm-7.

I am sure I am missing something basic here. Can some one please enlighten me?


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