Oracle VM 3.1.1: Cloning virtual disks between local filesystems

Hi all,
Is it possible to clone virtual disk between two repositories where each repository is based on own local filesystem?
I receive an error when trying to do such clone in OVM Manager:
OVMAPI_7262E Unable to find an owned and running server to perform copy_file operation on +diskname+thanks in advance,
Miroslaw

You can clone disks between repositories, if both repositories are presented to at least one server at the same time.

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Oracle VM 2.2: why virtual disk must be 1GB or larger?

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OK, but it seems like this arbitrary limit provides no benefit. In my case I actually do want a small disk image. I want to use it to pass small amounts of configuration information to a VM at startup, but it seems like this won't be possible via OVM interfaces (I can't create a small private disk image, I can't import an existing disk image, etc). So it looks like I'll have to go under the covers and manipulate the VM image directly.
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For performance reasons, I'd like to migrate my .img file based virtual disks into physical partitions for VM's.
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Thanks,
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hobeygo wrote:
What is the safest possible way to migrate all partitions (including / partition) from a virtual disk to a block device?Create block devices the same size as your .img files and then use dd to copy the contents of the .img file to the block device. Your VMs need to be offline while you do this. Once you've done this, you can use Oracle VM Manager to remove the original .img file and replace it with the physical block device copy. This is low-risk, as the .img file will still be there if the new block device doesn't work.
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Cannot see more than one shared virtual disk at a time

I have multiple virtual disks configured and as I add them to the specific virtual machine im using it modifies the vm.cfg as follows:
disk = ['file:/OVS/running_pool/110_openfiler/System.img,hda,w',
',hdc:cdrom,r',
'file:/OVS/sharedDisk/openfiler-ocs-u01.img,hdd,w!',
'file:/OVS/sharedDisk/openfiler-ocs-u02.img,hde,w!',
'file:/OVS/sharedDisk/openfiler-SAN-test.img,hdf,w!',
when the machine boots up the contents of /dev only contains the shared drive hdd, thus I cannot see hde or hdf.
One thing I tried was to edit the vm.cfg after adding the shared drives to the machine to mimic:
disk = ['file:/OVS/running_pool/110_openfiler/System.img,hda,w',
',hdc:cdrom,r',
'file:/OVS/sharedDisk/openfiler-ocs-u01.img,sda,w!',
'file:/OVS/sharedDisk/openfiler-ocs-u02.img,sdb,w!',
'file:/OVS/sharedDisk/openfiler-SAN-test.img,sdc,w!',
This allows me to see all three drives when I issue fdisk -l
Disk /dev/hda: 105.2 GB, 105226698752 bytes
255 heads, 63 sectors/track, 12793 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hda1 * 1 13 104391 83 Linux
/dev/hda2 14 12539 100615095 83 Linux
/dev/hda3 12540 12793 2040255 82 Linux swap / Solaris
Disk /dev/sda: 20.9 GB, 20971520512 bytes
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Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
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Disk /dev/sdb: 20.9 GB, 20972569088 bytes
255 heads, 63 sectors/track, 2549 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 2550 20481024 ee EFI GPT
Disk /dev/sdc: 104.8 GB, 104857600512 bytes
255 heads, 63 sectors/track, 12748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 12749 102400000 ee EFI GPT
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I found that there are 4 IDE disks and 7 SCSI disks at most for HVM guest on Oracle VM 2.1 version. For IDE disks, The available disknames are from hda to hdd; and for SCSI disks, are from sda to sdg. you may make test about it. :)
Message was edited by:
Changhai

Virtual Disk used Size is Zero

Hi All,
Got a 3.0.2 test environment, 2 hosts with a seperate physical VM Manager box. Been creating Xen PVM guests using both a downloaded OL5U7 template to clone from as well as using network boot to extracted iso via ftp (also OL5U7).
For the clones, I noticed the virtual disk name defaults to a 32-character string while I could name the virtual disk for the network boot method. What's the best practise for organising this? Should I leave the Virtual Disk name blank so it defaults to a 32-character string like the cloned guests?
Also, in Homes > Server Pools > Repositories > Virtual Disks, the cloned guests are showing the correct virtual disk usage but for the guests created using network boot to iso is showing zero for disk usage. The only difference I see between the 2 types of guests is the giest created using the extrated iso is using lvm for the root partition.
Is there a way to refresh the ovm manager view such that the disk usage is accurate for the guests?
Thanks.

831583 wrote:
For the clones, I noticed the virtual disk name defaults to a 32-character string while I could name the virtual disk for the network boot method. What's the best practise for organising this? Should I leave the Virtual Disk name blank so it defaults to a 32-character string like the cloned guests?Up to you. The actual filename will always be the UUID. The Manager just allows you to name new disks for display in the Manager only.
Also, in Homes > Server Pools > Repositories > Virtual Disks, the cloned guests are showing the correct virtual disk usage but for the guests created using network boot to iso is showing zero for disk usage. The only difference I see between the 2 types of guests is the giest created using the extrated iso is using lvm for the root partition.Correct. For a Network Boot image, the initial disk usage is 0. This will increase over time as more content is stored inside the image.
Is there a way to refresh the ovm manager view such that the disk usage is accurate for the guests?Refresh the repository.

Want to convert existing Parallels virtual disk to Boot Camp

I have an existing Parallels VM running on a virtual disk. I'd like to transfer that to a Boot Camp partition. Can this be done?
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I was only saying that whatever VMware and Parallels do to have one license for VM AND for Boot Camp "stretches" the EULA a bit.
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easily migrates a Windows-based computer to a virtual environment (P2V) and vice versa (V2P)
http://www.paragon-software.com/home/vm-professional/features.html
Supported Virtual Machines
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VMware™ Fusion
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http://www.paragon-software.com/home/vm-professional/
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http://blogs.technet.com/aviraj/archive/2009/01/17/windows-7-boot-from-vhd-first -impression-part-1.aspx

Oracle VM 3.0.2 cloning guest

Hi all,
I have issue with disk performance during VM cloning.
there is just one virtual disk (35G) and cloning of this this is very long. As I understood OVM is just do copy of this disk and nothing more special. In 3 minutes only 1GB, my network is 100MB, HDD is simple SATA 7200rpm, my repository in OVM Linux machine. So source and destination folders are same. With Linux "cp" command this is much faster.
[root@ovm VirtualDisks]# ll -h 0004fb0000120000d3a9f7302106e8d9.img
-rw------- 1 root root 4.7G Nov 29 14:08 0004fb0000120000d3a9f7302106e8d9.img
[root@ovm VirtualDisks]# time (cp /storage/VirtualDisks/0004fb0000120000d3a9f7302106e8d9.img /storage/)
real 0m6.940s
user 0m0.586s
sys 0m4.100s
[root@ovm VirtualDisks]#
Where is mistake or this is just normal for OVM?

__OUTSIDER___ wrote:
I have issue with disk performance during VM cloning.
there is just one virtual disk (35G) and cloning of this this is very long. As I understood OVM is just do copy of this disk and nothing more special. In 3 minutes only 1GB, my network is 100MB, HDD is simple SATA 7200rpm, my repository in OVM Linux machine. So source and destination folders are same. With Linux "cp" command this is much faster. We use dd to clone disk images on NFS, or reflink on ocfs2 repositories. The reflink is instant, the dd is not.

How to add a virtual disk into a 'guest VM' after VM has been created?

Well, it was easy when one need to add a virtual disk before creating a guest VM. All need to do was to edit the template and click on disk tab and create a virtual disk.
However the challenge comes after created a 'guest VM'. I need to add additional virtual disk into this 'guest VM'.
This is what I did.
Click on Repositories tab --> Under repositories--> Virtual Disks. There is a green "+" sign. Click on it. It says create virtual disk. Follow the instruction, I enter the virtual disk name, size, and select if it is spare or non-spare. Hit ok. Well, everythings seems fine.
Next, I click on the "blue folder" icon which indicated import virtual disk. It asked me about Virtual disk download location.
According to the manual, http://docs.oracle.com/cd/E27300_01/E27309/html/vmusg-repo.html#vmusg-repo-vdisk
Virtual Disk download location: The URL for the virtual disk file. The URL protocols supported are HTTP, HTTPS, and FTP. For example:http://example.com/vdisks/myvdisk.img
How can I determine what is the URL in my case?
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Please help.
Thank you.

Virtual disks can only be added and removed at runtime from a PVM. You don't even need to know anything special. Just create the vdisk and use the VMs settings to occupy another slot with the new vdisk.
But as I said… this works only with PVMs, not HVMs. In case of a HVM, you will need to shut down the VM and add the disk afterwards, then fire it back up.
The little folder with the blue down arrow is for importing an existing vdisk file from a web- or ftp server. If you have already created the vdisk, you won't need that.

Error: The largest virtual disk that can be allocated is: 0 MB.

hi, when a create a new virtual machine, Oracle VM Manager gives the following error:
Error: The largest virtual disk that can be allocated is: 0 MB.
I have enought disk space in all partitions on VM Server.
Has anyone solved this??... How to ....
Regards from Chile (and sorry for my poor english)
RENÉ FELIPE VIANCOS S.
Director / IT Manager
CENTRO DE INFORMÁTICA Y COMPUTACIÓN
(Informatics and Computing Center)
UNIVERSIDAD DE LA SERENA
www.userena.cl
Message was edited by:
user621885

ok, i have changed for a new machine, and the error persists
Step (1), and the output of virt-install is:
[root@ovm21 winxpue5]# 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? winkkxp
How much RAM should be allocated (in megabytes)? 1000
What would you like to use as the disk (path)? winkkxp
How large would you like the disk (winkkxp) to be (in gigabytes)? 5000
Would you like to enable graphics support? (yes or no) yes
What would you like to use for the virtual CD image? /OVS/iso_pool/winxpue5/winxpue5.iso
Starting install...
libvir: Xen Daemon error : GET operation failed:
Traceback (most recent call last):
File "/usr/sbin/virt-install", line 476, in ?
main()
File "/usr/sbin/virt-install", line 440, in main
dom = guest.start_install(conscb)
File "/usr/lib/python2.4/site-packages/virtinst/XenGuest.py", line 379, in start_install
self._create_devices()
File "/usr/lib/python2.4/site-packages/virtinst/XenGuest.py", line 281, in createdevices
disk.setup()
File "/usr/lib/python2.4/site-packages/virtinst/XenGuest.py", line 96, in setup
os.write(fd, '\x00')
OSError: [Errno 28] No space left on device
here is the df command output
S.ficheros Tamaño Usado Disp Uso% Montado en
/dev/sda2 3,0G 718M 2,1G 26% /
/dev/sda3 108G 755M 107G 1% /OVS
/dev/sda1 99M 24M 70M 26% /boot
tmpfs 257M 0 257M 0% /dev/shm
all filesystems have enought disk space....
Here is the content of the xend.log:
[2008-03-09 21:48:35 2534] INFO (SrvDaemon:331) Xend Daemon started
[2008-03-09 21:48:35 2534] INFO (SrvDaemon:335) Xend changeset: unavailable.
[2008-03-09 21:48:35 2534] INFO (SrvDaemon:342) Xend version: Unknown.
[2008-03-09 21:48:35 2534] DEBUG (XendDomainInfo:132) XendDomainInfo.recreate({'max_vcpu_id': 1, 'cpu_time': 9577805624L, 'ssidref': 0, 'hvm': 0, 'shutdown_reason': 0, 'dying': 0, 'online_vcpus': 2, 'domid': 0, 'paused': 0, 'crashed': 0, 'running': 1, 'maxmem_kb': 4294967292L, 'shutdown': 0, 'mem_kb': 524288L, 'handle': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 'blocked': 0, 'name': 'Domain-0'})
[2008-03-09 21:48:35 2534] INFO (XendDomainInfo:148) Recreating domain 0, UUID 00000000-0000-0000-0000-000000000000. at /local/domain/0
[2008-03-09 21:48:35 2534] DEBUG (XendDomainInfo:2069) Storing VM details: {'on_xend_stop': 'ignore', 'shadow_memory': '0', 'uuid': '00000000-0000-0000-0000-000000000000', 'on_reboot': 'restart', 'image': '(linux (kernel ))', 'on_poweroff': 'destroy', 'on_xend_start': 'ignore', 'on_crash': 'restart', 'xend/restart_count': '0', 'vcpus': '2', 'vcpu_avail': '3', 'name': 'Domain-0'}
[2008-03-09 21:48:35 2534] DEBUG (XendDomainInfo:907) Storing domain details: {'name': 'Domain-0', 'console/limit': '1048576', 'memory/target': '524288', 'vm': '/vm/00000000-0000-0000-0000-000000000000', 'domid': '0', 'cpu/0/availability': 'online', 'cpu/1/availability': 'online', 'control/platform-feature-multiprocessor-suspend': '1'}
[2008-03-09 21:48:35 2534] DEBUG (XendDomain:434) Adding Domain: 0
[2008-03-09 21:48:35 2534] DEBUG (XendDomain:379) number of vcpus to use is 0
[2008-03-09 21:48:35 2534] INFO (SrvServer:180) unix path=/var/lib/xend/xend-socket
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: VBD.set_device not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: VBD.set_type not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: VM.get_auto_power_on not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: VM.set_auto_power_on not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: debug.get_all not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: console.get_other_config not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: console.set_other_config not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: VIF.get_network not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: VIF.set_device not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: VIF.set_MAC not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: VIF.set_MTU not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: session.get_all_records not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: event.get_record not found
[2008-03-09 21:48:35 2534] WARNING (XendAPI:672) API call: event.get_all not found
[2008-03-09 21:48:35 2534] DEBUG (XendDomainInfo:991) XendDomainInfo.handleShutdownWatch
[2008-03-09 21:48:38 2534] INFO (XMLRPCServer:149) Opening Unix domain socket XML-RPC server on /var/run/xend/xen-api.sock; authentication has been disabled for this server.
[2008-03-09 21:48:38 2534] INFO (XMLRPCServer:149) Opening Unix domain socket XML-RPC server on /var/run/xend/xmlrpc.sock.
Step(2) rpc output:
[root@ovm21 winxpue5]# /opt/ovs-agent-2.2/utils/do_rpc.py https://admin:[email protected]:8899 get_free_space
get_free_space []
socket error! code=104, msg=Connection reset by peer
[root@ovm21 winxpue5]# /opt/ovs-agent-2.2/utils/do_rpc.py https://system:[email protected]:8899 get_free_space
get_free_space []
socket error! code=104, msg=Connection reset by peer
[root@ovm21 winxpue5]# /opt/ovs-agent-2.2/utils/do_rpc.py https://sys:[email protected]:8899 get_free_space
get_free_space []
socket error! code=104, msg=Connection reset by peer
my password for whole system is 'oracle'
some ideas ????
Regards
René Felipe Viancos.

Cloning ASM disks question?

I have a customer who has been running oracle 10.2.0.4 two node rac on HPUX Itanium platform and using raw devices for the datafile locations. They use EMC clraion for the storage platfom.
The customer uses EMC snapshot/cloning technology on the storage side to create a clone of the database luns for their staging database environment. This works well and they are able to simply snap the luns on the storage side and then simply mount them on another host and bring the database copy up an another host.
Well, now that they are in the process of 11g upgrade and the fact that raw devices will no longer be supported going forward for the most part the cusomter would like to start to use ASM for the clustered file system for the RAC databases.
I am trying to find out if there are any white papers or some documentation on how we could make clones when the disks are ASM disks? I know that EMC can snapshot the luns as they have in the past but not sure how we can get them mounted up in another ASM instance on a separate server?
Just wanting to know if anyone has some experience on cloning ASM disk or disk groups between different hosts and maybe some supporting documentation to go along with it.
Thanks.

YOU CAN. You can use the same EMC copy for the ASM Lun, attach it to another server and can start the ASM instance up. It is quiet same as you were doing it with raw devices.
ASM files has ASM headers on it. When you copy the disks over, asm instance can recognize those headers and be able to come online. ASm instance can identify the copied disks from their disk headers.

Can not import Share virtual disk

I'm using ocfs2 filesystem
to creating a virtual shared disk oracle VM Manager -> Resources -> Shared Virtual Disks
Server Pool name: mypool
Group Name:
Virtual Disk Name: sharedisk
Virtual Disk Size: 5000
Description:
Can not selected Share virtual disk files which is null when import.what is error?
thank

Hi,
please clarify your error a little bit more.
a.) Did the create work correctly? Or did you get an error? If yes what error?
b.) Did you have problems attaching the Shared Disk to the VM?
Sebastian

Oracle VM Templates: Resizing a Template's Disk

Is it possible to shrink (i.e., resize) the Virtual Disk of a Virtual Machine Template? Specifically, I'd like to to reduce the size of the +12GB Virtual Disk that's prepackaged with the OVM_OL6U2_x86_64_PVM template (that comes as part of the Oracle Linux 6 Update 2 template (OVF) - Paravirtualized x86_64 (64 bit) assembly - OVM_OL6U2_x86_64_PVM.ova [Oracle P/N V33689-01]).
Eric Pretorious
Truckee, CA

francok wrote:
i test to import the JDE Enterprise Server E1 from the Oracle VM Templates. I get a error, that they miss the system.img file. i know that in this template only the E1_ENT.img is in. On OVM 2.2.2 it will work because the import is another way. So i just copy the system.img to that template make a new tar and import it, and now it will work. But is there a date or a relaunch from the templates to work official with OVM 3.0.1? i see that on the E1-JDE Templates the Date is form 9.September 2011, but i dont see what they have changed. So what is the best way for import without any modifications Oracle VM Templates to Oracle VM Server 3.0.1?The existing templates should import into OVM3 without modification. I'll try and get the test/QA guys to look at the JDE template and check this as well.

VM 3.2.3 Problem attaching virtual disks

OVM Server: 3.2.3-521
OVM Manager: 3.2.3-521
Guest machine: Oracle Solaris 10 x86.
As per documentation, on guest machine can be attached 4 IDE disks and 7 SCSI disks. Using VM manager I can’t attach more than 4 virtual disks to this machine. Also Oracle Solaris has built-in PV drivers, so in this case up to 52 disks can be attached.
How to attach more than 4 virtual disks to the guest machine?
Regards,
Kosta

Thanks, for your responce.
Guest machine is created as domain type: XEN HVM, PV Drivers.
Regards,
Kosta

Understanding Virtual Disks and Sparse Allocation

1. From the doc here , i understand that allocation is fast when "Sparse Allocation" is used while creating a virtual disk and is slow when using non-sparse allocation. But does this mean that we are just talking about allocation alone? i.,e a one time activity - creation.
2. If my repository has 1TB space , then i see that i can create 'n' Virtual Disks each with a size of more than a 1TB(i.e, lets say 3-4 VDisks each with a size of 1TB); whereas, if i use non-sparse allocation, then i have to have the sum of the sizes of the disks to be lesser than 1TB.
FYI : I get an error if i allocate more than the space available: "OVMRU_002032E Excl-BigRepos - Repository size not large enough for new virtual disk of size: 999,999,999"
3. When i install OVS on a RAID-1 partition(with two virtual disks - say 100GB and 400GB), then, OVS picks up the 100GB disk by default and installs in there. And this 100GB is not 'visible' henceforth. Reasons?

1. Correct. Spare allocation means as the data is written the disk is expanded. This means, you're doing two operations as opposed to one with non sparse allocation. Thus, when writing to a virtual disk with a sparse allocation, the "write" could take longer if the disks doesn't have free space available.
2. Too a degree.... Yes. It depends on what storage you're using. On some storage, using compression and deduplication, this is not entire accurate. But, this is independent of anything to do with Oracle VM. Many storage environments now use "virtual allocation".
3. The default "LUN" used by by OVS can not be used for anything else. It is reserved. You will not able to use any free space on that LUN. The OVM manager expect "raw disks/LUN/shares" to used as storage. Such storage my be free of any filesystem, partition or etc. The Pools and repos necessary to run Oracle VM use a ocfs2 filesystem.

Shared Virtual Disk

When creating a virtual shared disk oracle VM Manager -> Resources -> Shared Virtual Disks the only option you have are
Virtual Disk Name:
Virtual Disk Size:
Server Pool name:
Group Name:
Description:
My question is how do you know what this virtual disk is mapped to? i.e. SAN, NFS, LOCAL DISK?
Also how do you specific what disk to use ideally I would like the virtual disk to use a 150GB LUN from my SAN?

With the exception of multipath devices (and plain files obviously), there is no user interface for other kinds of devices for back end storage for DomUs, but Xen supports them. You have to edit the config yourself. They are in /OVS/running_pool/<name>/vm.cfg
Look for the disk = line and edit it to something like this:
disk = [
'phy:/dev/DomUDisk2/LVOracleApp,xvda,w',
In this case, I used a local LVM logical volume as back end storage (/dev/DumUDisk2) and I mapped it to the paravirtual device in the vm (xvda). You have to do something similar. I don't have a SAN/HBAs, but assuming your LUN shows up on Dom0 as /dev/sda, you might give a try to something like:
disk = ['file:/OVS/running_pool/myvm/System.img,hda,w', # or whater you want to do for the boot/root disk
*'phy:/dev/sda,xvda,w',* ]
Once this works, you might want to configure multipath if your hardware supports it.
Best of luck, keep us posted.

Oracle VM 3.1.1: Cloning virtual disks between local filesystems

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