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..
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..
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?
Thanks..
On 4/3/07, WipeOut wipe_out@users.sourceforge.net wrote:
So where is the LVM config? How do I tell it there are now LVM volumes that need to be accessed?
Your answer is very likely in /etc/lvm/* though I'm not sure specifically what you'd need to modify in there. I've not done what you're doing.
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of WipeOut Sent: Tuesday, April 03, 2007 6:40 AM To: CentOS mailing list Subject: [CentOS] 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
______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.
Ross S. W. Walker wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of WipeOut Sent: Tuesday, April 03, 2007 6:40 AM To: CentOS mailing list Subject: [CentOS] 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..
WipeOut spake the following on 4/3/2007 8:23 AM:
Ross S. W. Walker wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of WipeOut Sent: Tuesday, April 03, 2007 6:40 AM To: CentOS mailing list Subject: [CentOS] 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..
Going from an IDE drive to a SCSI drive means you will have to make an initial ramdisk on the new system (initrd). The scsi drivers are modules in the kernel, and without an initrd with the drivers included and enabled, you can't mount the root to finish booting. Look here for a fix; http://kbase.redhat.com/faq/FAQ_80_3902.shtm
I don't see how an emulated scsi drive will perform any better than an emulated IDE drive, but I suppose it is possible.
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Scott Silva Sent: Tuesday, April 03, 2007 12:59 PM To: centos@centos.org Subject: [CentOS] Re: Where is the LVM config stored?
WipeOut spake the following on 4/3/2007 8:23 AM:
Ross S. W. Walker wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of WipeOut Sent: Tuesday, April 03, 2007 6:40 AM To: CentOS mailing list Subject: [CentOS] 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..
Going from an IDE drive to a SCSI drive means you will have to make an initial ramdisk on the new system (initrd). The scsi drivers are modules in the kernel, and without an initrd with the drivers included and enabled, you can't mount the root to finish booting. Look here for a fix; http://kbase.redhat.com/faq/FAQ_80_3902.shtm
Yes, of course, and if your rsync'd modprobe.conf didn't include the SCSI driver it wouldn't make it into the initrd unless you modified modprobe.conf and manually added it afterward before running mkinitrd.
I don't see how an emulated scsi drive will perform any better than an emulated IDE drive, but I suppose it is possible.
I guess it would depend if it emulated tagged queuing and command recursion and if it implemented it decently, but conceivably it is possible to have emulated scsi that out performs emulated ide with these two features implemented.
-Ross
______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.
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..
Going from an IDE drive to a SCSI drive means you will have to make an initial ramdisk on the new system (initrd). The scsi drivers are modules in the kernel, and without an initrd with the drivers included and enabled, you can't mount the root to finish booting. Look here for a fix; http://kbase.redhat.com/faq/FAQ_80_3902.shtm
I don't see how an emulated scsi drive will perform any better than an emulated IDE drive, but I suppose it is possible.
Scott, Thanks for the link and the input.. That seems to have solved the problem.. I wasn't aware that scsi needed the initrd generated.. To tell the truth I still don't know exactly what it does (my linux skills are pretty limited) but its working.. :)
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of WipeOut Sent: Tuesday, April 03, 2007 11:24 AM To: CentOS mailing list Subject: Re: [CentOS] Where is the LVM config stored?
Ross S. W. Walker wrote:
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of WipeOut Sent: Tuesday, April 03, 2007 6:40 AM To: CentOS mailing list Subject: [CentOS] 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..
If you went through the trouble of creating a minimal install why rsync it?
Just get the rpm list from PC, diff with rpms on VC and install the ones that are missing.
Once you have done that you can find the application and system config files that changed on PC by doing an rpm audit and rsync just those files, making sure to modify them on VC to reflect it's setup that differs from PC.
Of course /usr/local, /home and any other non-managed storage locations can be safely rsync'd between the two hosts, but I would not use rsync to replicate managed areas that rpm would normally take care of.
If you start using kickstart it will make your life a lot easier.
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?
I would have a kickstart script duplicate the setup of host A and do a fresh install on host B with that script.
If you hunt around you may find an automated script that will create it for you.
-Package selection -User & group accounts -authconfig, timezone, etc. -Diffs the config file changes on A from dist version and patches config files on B from those diffs, taking care not to do so on critical config files that can change from setup to setup. -rsync or tar-over-ssh the unmanaged storage locations
Thanks..
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.
-
Jim Perrin -
Ross S. W. Walker -
Scott Silva -
WipeOut