Ross S. W. Walker wrote:
-----Original Message-----
From: centos-bounces@xxxxxxxxxx
[mailto:centos-bounces@xxxxxxxxxx] On Behalf Of WipeOut
Sent: Tuesday, April 03, 2007 6:40 AM
To: CentOS mailing list
Subject: Where is the LVM config stored?
Hi,
I am trying to migrate one of my systems to a VMware virtual
machine..
The PC is an IDE drive using LVM and the virtual machine is a
SCSI drive
using ordinary partitions..
Basically I rsynced the entire filesystem from the physical to the
virtual machine and that seemed to work just fine.. I installed grub
onto the drive in the virtual machine and its booting fine..
What tool did you use to copy the host filesystem?
To what physical medium did you copy it to, vmware virtual disk file
or physical partition/logical volume?
The problem comes when the new system trys to scan for the LVM setup
that was on the previous PC.. I thought it would scan the drive, and
seen that there are no LVM partitions and move on but it
doesn't it has
a kernel panic and flashes the cap lock and scroll lock LED's on the
keyboard.. Obviously somewhere its being told there should be an LVM
partition or its being told to scan hda rather than sda..
The LVM information is stored in the disk volume itself, there are
backup copies of the configuration routinely dumped to
/etc/lvm/backup, and archive copies of volume groups stored in
/etc/lvm/archive.
Make sure this "copy" of your physical host's drive isn't somehow
being accessed by the physical host at the same time as the virtual
host.
I have checked the grub.conf and fstab files and they are all
right for
the new drive setup..
So where is the LVM config? How do I tell it there are now
LVM volumes
that need to be accessed?
If the PV headers were copied in the volume copy it should pick
those up on the pvscan, then vgscan will see any volume groups
defined within the PVs and lvscan should find any LVs within
the volume groups.
-Ross
Maybe I should explain exactly what I did because perhaps I am doing it
all wrong and thats why I am having so many issues..
I have a Physical Centos box (we will call it PC) and I want to turn it
into a Virtual Centos box (VC).. I created the virtual machine in the
VMWare server console and then installed VC with a minimum Centos4
install.. I then went to PC and ran rsync with the various switches to
copy the entire filesystem from PC to VC across the network.. I excluded
/dev, /proc and /sys.. I also used the --delete option to remove any
files that exited on VC that were no longer on PC.. Then before
rebooting VC I checked fstab and grub.conf files to make sure they were
correct.. Finally I restarted VC and booted from CD1 in rescue mode to
run grub-install to get the boot sector and start up working right..Then
rebooted VC.. It starts up and then freaks when trying to sort out the
LVM volumes..
The difference between PC and VC is that in VC I have decided to use a
scsi drive (apparently better performance) and in PC its an IDE and I
have made the virtual drive bigger.. I have tried running PC with and
without LVM (in other words using normal formatted partitions) and it
seems to have the same problem.. So even when no LVM volumes exist its
still looking for them..
Obviously I have both systems live an running when I am doing the data
transfer.. There are no errors but would this cause a major issue?
How do you migrate form physical to virtual?
Thanks..
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