Re: [Xen-users] Mounting Xen LVM Guests

[Eredicator X <eredicatorx@xxxxxxxxxxxxxxx>]

Thanks Mark, 

I tried that as well. But it does not mount. 

I think what I am failing to understand here is when I create a guest on a lvm 
as I did here;

> > #What would you like to use as the disk (file path)?
> > /dev/xen-system/test01.max

What is the underlying file system type that is created? 

If I try to mount it w/o a type it says "mount: you must specify the filesystem 
type"  When I try to mount it with ext3 it does not mount and gives this error. 


> > #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





----- "Mark Walkom" <markwalkom@xxxxxxxxx> wrote:

> All you need to do is;
> 
>    1. Have a mount point, eg /mnt/tmp
>    2. mount /dev/xen-system/test01.max /mnt/tmp
> 
> That is really all that is needed.
> You may need to specify the filesystem, but mount will complain if it
> needs
> it.
> 
> eg;
> root@newnewyork:/mnt/tmp# lvscan|grep utils
>   ACTIVE            '/dev/vm-storage/utils-disk' [5.00 GB] inherit
>   ACTIVE            '/dev/vm-storage/utils-swap' [512.00 MB] inherit
> root@newnewyork:/tmp# mount /dev/vm-storage/utils-disk /mnt/tmp/
> root@newnewyork:/tmp# cd /mnt/tmp/
> root@newnewyork:/mnt/tmp# ls -l
> total 88
> drwxr-xr-x  2 root root  4096 2008-07-17 18:17 bin
> drwxr-xr-x  2 root root  4096 2006-10-29 00:07 boot
> drwxr-xr-x  4 root root  4096 2008-07-17 18:09 dev
> drwxr-xr-x 48 root root  4096 2008-12-26 13:07 etc
> drwxr-xr-x  3 root root  4096 2008-07-17 18:14 home
> drwxr-xr-x  2 root root  4096 2008-06-14 19:19 initrd
> drwxr-xr-x  9 root root  4096 2008-07-17 21:27 lib
> lrwxrwxrwx  1 root root     4 2008-07-17 18:11 lib64 -> /lib
> drwx------  2 root root 16384 2008-06-14 19:15 lost+found
> drwxr-xr-x  2 root root  4096 2008-06-14 19:19 media
> drwxr-xr-x  2 root root  4096 2006-10-29 00:07 mnt
> drwxr-xr-x  2 root root  4096 2008-06-14 19:19 opt
> drwxr-xr-x  2 root root  4096 2006-10-29 00:07 proc
> drwxr-xr-x  2 root root  4096 2008-09-13 14:25 root
> drwxr-xr-x  2 root root  4096 2008-07-17 18:11 sbin
> drwxr-xr-x  2 root root  4096 2008-06-14 19:19 srv
> drwxr-xr-x  2 root root  4096 2008-01-21 20:33 sys
> drwxrwxrwt  2 root root  4096 2008-09-13 14:26 tmp
> drwxr-xr-x 10 root root  4096 2008-07-17 18:11 usr
> drwxr-xr-x 14 root root  4096 2008-07-17 18:21 var
> 
> 
> 2009/1/7 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.htmldespite
> 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?
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users