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Re: [Xen-users] Problems to start a xen DomU using a logical volume.


I finaly found the source problem. The kernel panic error was happening and the dracut was complaining
"dracut: chroot: failed to run command `/sbin/load_policy': No such file or directory" 

because some lib64 packages that chroot needs to have a perfect behavior was not included inside guest filesystem that I had created

When these pachages were included into /lib64 of the guest root filesystem everything worked well.

2013/1/22 Leopoldo Mauricio <leopoldo@xxxxxxxxxxxxxx>
Hi guys,

I followed this article to install my first xen project to compare its CPU/memory and I/O performance with a kvm domain on CentOS 6.4. 

In the initial tests whit super.pi benchmarck the CPU performance of my xen domai was extremely worst than my kvm domain. 

Well, I am think that maybe, something was wrong in my xen setup. So I decided to boot a new xen guest using a logical volume filesystem instead a disk image, to see whether CPU performance will be better. But this setup is not working

That is the error (when I try to create a guest domain with a logical volume filesystem):
Anyone knows what i need to do tho solve this problem?

[root@xen]# xm create xen-pv01.cfg -c
Using config file "./xen-pv01.cfg".
EXT3-fs (xvda1): mounted filesystem with ordered data mode
dracut: Mounted root filesystem /dev/xvda1
dracut: chroot: failed to run command `/sbin/load_policy': No such file or directory
dracut: Switching root
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100

Pid: 1, comm: switch_root Not tainted 3.7.1-3.el6xen.x86_64 #1
Call Trace:
 [<ffffffff8149d541>] panic+0xc4/0x1d6
 [<ffffffff81047131>] do_exit+0x3a5/0x834
 [<ffffffff8111e70f>] ? vfs_write+0xd2/0x10a
 [<ffffffff8104763d>] do_group_exit+0x7d/0xa5
 [<ffffffff8104767c>] sys_exit_group+0x17/0x1b
 [<ffffffff814a6899>] system_call_fastpath+0x16/0x1b

I've created a logical volume for my Xen guest system following the instructions of this article:

And that is my Xen configuration file:

name            = "xen-pv01"
kernel          = "/boot/vmlinuz-3.7.1-3.el6xen.x86_64"
ramdisk         = "/boot/initrd-3.7.1-3.el6xen.x86_64-no-scsi.img"
memory          = 4000
vif             = ['bridge=xenbr0, ip=']
vcpus           = 1
disk            = ['phy:vg_xen/lvxenteste,xvda1,w']
root            = "/dev/xvda1 ro"

And my Dom0 configuration:

title CentOS (3.7.1-3.el6xen.x86_64)
        root (hd0,0)
        kernel /xen.gz dom0_mem=40000M cpufreq=xen dom0_max_vcpus=1 dom0_vcpus_pin
        module /vmlinuz-3.7.1-3.el6xen.x86_64 ro root=/dev/mapper/vg_xen-lvroot rd_NO_LUKS LANG=en_US.UTF-8  KEYBOARDTYPE=pc KEYTABLE=us-acentos rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=vg_xen/lvroot rd_NO_DM rhgb quiet
        module /initramfs-3.7.1-3.el6xen.x86_64.img

Am I missing something


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