Creating a Virtual Disk using Diskpart

Hi, I'm trying to study for a test on Windows 7 and I'm trying to install a Virtual disk and I keep getting the same error. The drive has been "cleaned" using the diskpart utility and is a 300 gb drive. here is the code that I used and the error
as copied from the command prompt. Any help would be great Thanks!!!!!!
DISKPART> create vdisk file="C:\test\disk1.vhd" maximum=24000
DiskPart has encountered an error: The system cannot find the path specified.
See the System Event Log for more information.

Hi, slobodan21.
Here is the web page that contains the CREATE vdisk command you have been trying:
http://technet.microsoft.com/en-us/library/gg252579.aspx
I am only guessing but... make sure you create a folder called test in the root of your C: drive.
Good luck!
Best wishes, Davin Mickelson

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Unable to create filesystem (mkfs.ext4) on large 2TB GPT virtual disk using Linux VM.

I am unable to create a file system on a large (> 2TB disk) virtual disk for a Linux VM. I can create the disk, attach it to the VM, partition it with "parted", but I cannot run mkfs.ext4. Details below.
Hyper-V 2012 Core (w/ all Windows/Microsoft updates as of 4/19).
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Using /dev/sdc
(parted) print
Model: Msft Virtual Disk (scsi)
Disk /dev/sdc: 11.0TB
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then run: mkfs.ext4 /dev/sdc1
repeating error on console from mkfs.ext4:
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-rw-------. 1 root root 25085329408 Apr 19 23:15 messages
Apr 19 17:39:28 nfs2 kernel: sd 4:0:0:0: [sdc] Sense Key : No Sense [current]
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Same problem happens when running "mkfs.ext4 -E lazy_itable_init=1 /dev/sdc1"

Hi,
Thank you for your post.
I am trying to involve someone familiar with this topic to further look at this issue.
Lawrence
TechNet Community Support

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).
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831583 wrote:
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Is there a way to refresh the ovm manager view such that the disk usage is accurate for the guests?Refresh the repository.

Is there a way to create a virtual network using C# and the Azure SDK/API?

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Hi,
As discuss above , we have to create the XML response ,before that first you have to
GetConfiguration() details of existing virtual network.
string.format("@<NetworkConfiguration xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns='http://schemas.microsoft.com/ServiceHosting/2011/07/NetworkConfiguration'>
<VirtualNetworkConfiguration>
<Dns />
<VirtualNetworkSites>
<VirtualNetworkSite name=""{0}"" Location=""{1}"">
<AddressSpace>
<AddressPrefix>10.0.0.0/8</AddressPrefix>
</AddressSpace>
<Subnets>
<Subnet name=""Subnet-2"">
<AddressPrefix>10.0.0.0/11</AddressPrefix>
</Subnet>
</Subnets>
</VirtualNetworkSite>",Networkname,location)+(@"<VirtualNetworkSite name=""demodsf1"" Location=""West Europe"">
<AddressSpace>
<AddressPrefix>10.0.0.0/8</AddressPrefix>
</AddressSpace>
<Subnets>
<Subnet name=""Subnet-1"">
<AddressPrefix>10.0.0.0/11</AddressPrefix>
</Subnet>
</Subnets>
</VirtualNetworkSite> </VirtualNetworkSites>
</VirtualNetworkConfiguration>
</NetworkConfiguration>")
you have to append the node for existing node with new values , i got it its adding new virtual network
Best regards,

How to create a "virtual' album using pointers

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Server 2008 R2 Enterprise - 1 Virtual Disk - Using UEFI - 4.5 TB available - Why 2 Disk 0 - Unallocated space entries?

Hello everyone,
I'm building a new Dell R720 server. It has a RAID 5 - 6 x 1TB array.
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Thanks!

So the answer for this; was after contacting Dell the newer generation Dell servers need to be booted up through the lifecycle controller (F10) > UEFI has to be explicitly chosen (Most of the Dell build discs are configured as MBR) and once the Lifecycle
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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
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Where is the newly created virtual disk located? Isn't it supposed to be in Oracle Server? But it doesn't have a http server running there.
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.

Can Windows Server Backup spread a single backup job across multiple disks if they are not set up as a virtual disk?

This may be a dumb question, but I can't seem to find any definitive information after having done many, many searches. Short question is - can Windows Server Backup spread a single backup job across multiple disks if they are not in a storage
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Background:
I'm running Server 2012 Essentials with all Windows Updates installed. I have been backing up approx 2.8TB of data (Bare Metal Recovery, C:, S: (shared folders), and system reserved) for the past year+ onto a storage pool made up of two-2TB external
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pools. After doing research on this, I set up a new storage pool and virtual disk using all four drives via Powershell and thought I was good. However, when the backup ran, it failed after filling the first drive, saying there was no remaining capacity. In
reality there were three remaining empty drives and there storage pool reported almost 5TB of avail capacity. I assumed this was due to the identical uniqueid issue so I decided to try a different tactic.
Instead of using a storage pool that combines all four disks into one virtual disk, I just added each of them to Windows Server Backup as individual drives thinking it would manage them collectively. I.e., when a drive filled up during a particular backup,
it would just start using the next drive and so on. Apparently this was a foolish assumption because the backup failed again as soon as the first disk filled up.
So now I don't know if this is still an issue with the identical uniqueid's or if Server Backup actually can't spread a single backup across multiple individual drives that aren't in a pool or other virtual disk implementation. Hence, my original question.
My guess is that it does *not* spread them across individual disks, but I just wanted to get confirmation.
Thanks

Mandy,
Thank you for following up on my question.
Unfortunately the article you referenced doesn't address what I am trying to accomplish.
The article focuses on saving the same backup job to multiple disks and rotating the disks between on and offsite for enhanced protection. However, it still requires that an individual backup job fits on a single disk.
What I am trying to determine is if a single backup job can span across more than one physical disk (during the backup process) without those physical disks being in some type of virtual disk implementation (e.g., storage pool, RAID, etc.).
Thanks,
Gerry

How to move a virtual disk's physical allocation within a Storage Pool

I have a pool of 3x500GB where one the physical drives is having intermittent issues. Currently, there is only one parity Virtual Disk of 300GB Fixed across 3 columns. I want to replace the bad drive with a good one. The old way (pre-2012) was replace the
disk, repair the RAID 5, resync and done. These basic steps are not working.
So far I have added a 4th 500GB drive to the pool. After searching and failing to find a way to move the data non-destructively, I decided to just pull the data cable on the disk I wanted to replace. After refresh/rescan, the disconnected drive shows "lost
communication" and the virtual disk (after trying to repair) shows "unknown" (but the volume on that disk is accessible in Explorer). When I try to remove the physical disk in Server Manager, I get "The selected physical disk cannot
be removed". Reading the error message, I see that the replacement disk cannot contain any part of a virtual disk. The replacement disk that I just added appears to have some space allocated (possibly because I have tried this same procedure a couple
of times already?). When I look at the parity disk properties/health, it shows all four physical disks under "physical disks in use".
I have deleted and recreated a lot of storage pools lately while trying to understand how they work but I would like to avoid that this time. The data on the virtual disk in question is highly deduplicated and it took quite a while to get it that way. Since
I can't find a way to copy/mirror the disk while keeping it fully deduplicated, I would need 3x the space to copy it all off, or a lot of time to load up and deduplicate a new virtual disk.
I have several questions:
1. How can a 3 column parity disk use parts of four physical disks? And can that be fixed without recreating the virtual disk?
2. When creating a virtual disk (for example a 3 column disk in a pool that has four or more physical drives), is there a way to specify which physical disks to use?
3. I understand that after a physical disk failure, the recovery process will move a virtual disk's allocation to a replacement disk, but can a virtual disk's allocation be moved manually among physical disks within the same storage pool
using a PS script?
4. Can a deduplicated virtual disk be moved/mirrored/backed up without expanding the data?
Any help is appreciated.

Im still fighting with storage pools and need more tests to be done and have a lot of questions my self but ther goes what I understood so far.
You may define physical disks used for virtual disk by Powershell ,
for list of all commands follow this:
http://technet.microsoft.com/en-us/library/hh848705(v=wps.620).aspx ,
specific command defining physical disks to be used on already existing virtual disk:
Example 4: Manually assigning physical disks to a virtual disk
This example gets two physical disks that have already been added to the storage pool and designated as ManualSelect disks,
PhysicalDisk3 and PhysicalDisk4, and assigns them to the virtual disk
UserData.
PS C:\> Add-PhysicalDisk –VirtualDiskFriendlyName UserData –PhysicalDisks (Get-PhysicalDisk -FriendlyName PhysicalDisk3, PhysicalDisk4)
http://technet.microsoft.com/en-us/library/hh848702(v=wps.620).aspx
If You haven't seen this yet You may check it out http://blogs.technet.com/b/yungchou/archive/2011/12/06/free-ebooks.aspx

Server 2012 R2 iSCSI Target - Multiple targets per iSCSI Virtual Disk with CHAP

Scenario I am trying to achieve is this:
Windows Server 2012 R2 serves as iSCSI Target configured to have 1 iSCSI Virtual Disk
2 Hyper-V servers connecting to this target with iSCSI Inistator and have multiple targets for that iSCSI Virtual Disk using CHAP
**These 2 are nodes in fail over cluster, this iSCSI is added as a CSV.
Issue that I have, is that you can only have 1 target per iSCSI Virtual Disk
Both Hyper-V servers can connect to this LUN without issue when I add both initiator IDs to the target, but once I enable CHAP, you can only put one initiator ID in the "Name" field, so I can only connect from 1 Hyper-V server.
Do you know of a way around this?

From my understanding, "chaptest" is a single target, my goal was to make 2 targets to the same iSCSI virtual disk.
So if you were to right click the iSCSI virtual disk that "chaptest" is assigned to and click "Assign iSCSI Veritual Disk...", then select "New iSCSI Target, and proceed with the wizard it removes the "chaptest" target
and adds the new one just created.
My goal was to have 2 targets to 1 iSCSI VD, but seeing your screenshot, with 2 initiators connected, that goal doesn't seem needed anymore.
I was under the impression that the "User name" = the iscsi initiator IQN name, which had to be unique. That is why I thought I would need 2 targets.
Thanks

OVM-4006 The largest virtual disk that can be allocated is 78,027 MB

G'Day List,
Greetings and best wishes.
I am hoping someone will be able to help me here:
PROBLEM:
I tried to "Create New Virtial Disk" for a particuler VM and it error out as shown in the subject line.
Figuring that it was a space issue, I stopped another VM with a 800GB D drive - Deleted the 800GB
drive and attempted to "Create New Virtual Disk" of only 580GB and got the same error.
I do not believe it has to do with the SAN so I am looking for an OVM reason for the error and a solution.
Anyone?
Thanks
Ferg

Hi,
When you say - deleted 800 Gb drive does that mean taht you deleted the storage space for that virtual machine , or completely deleted the machne from amanger
If you have 2.2 version for OVM server - it displays the info about max memory and max disk space available to use .
If you are getting space related error make sure that you delete the stuff from the server and not the entry only from the manager database.
Try selecting a VM which you want or plan to delete to free up the space
Go to 'Actions' Menu and select delete
next page - Check " Remove image files from storage"
And hit "delete"
This will remove the entry from the server as well and free up the space.
you can also login to the server and do "# df -h" .This will also show you how much sapce is really available on the disk .

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.

Virtual Disk disappeared

Hi there,
I have a storage pool containing 3x2TB physcial disks: one WD and two Seagate. Pool have 2 virtual disks: Data (mirrored) and Temp (Simple). After some time Temp drive disappeared from the list and I lost all data on it. Not big deal but I want to
recreate storage pool as saw somewhere that data structure or something has changed since first release of Storage Spaces (I'm using them from first official beta of Windows Server 2012).
So as I'm lost my Temp drive, I decided to do following:
1) Delete WD disk from storage pool, so data will remain on 2xSeagate (I have about 1,5 TB of data)
2) Reformat WD as single drive and copy everything to it
3) Delete old storage pool
4) Create new one
5) Create mirrored virtual disk
6) Copy data back from WD to that virtual disk
But I'm stuck on removal WD from storage pool, as Server manager says me that there is not enough space in storage pool and I should first connect spare disk.
Looks like my Temp drive disappeared, but space not has been purged. So is there any way to get my Temp dirve back or manually run cleanup?
MCSE, MCITP, CCNA Security Subscribe to my blog at http://sypalo.com

Hi,
Sorry for my mistake, I mean that the data on the mirror virtual disk is striped across the three physical disks. As you mentioned the allocated space is less than a physical disk, you want to know if there is a way to shrink the virtual disk to let the allocated
space size is larger than the size of one physical disk.
You could use Optimize-Volume command line to optimize a volume, performing such tasks on supported volumes and system SKUs as defragmentation, trim, slab consolidation,
and storage tier processing. Then use Resize-VirtualDisk
command line to resizes the virtual disk to be smaller.
But if the allocated space is still less than a physical disk, you should attach a new spare disk when delete a physical disk.
In the meantime, if the virtual disk have a lot of duplication data, you can also enable data deduplication to get more allocated space in virtual disk.
For more detailed information, please refer to the articles below:
Step-by-Step: Enabling Data Deduplication on Windows Server 2012 Volumes
http://social.technet.microsoft.com/Forums/windowsserver/en-US/441858d0-0a17-4126-a594-ba1c6483c59b/virtual-disk-disappeared?forum=winserverfiles
Introduction to Data Deduplication in Windows Server 2012
http://blogs.technet.com/b/filecab/archive/2012/05/21/introduction-to-data-deduplication-in-windows-server-2012.aspx
Regards,
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Creating a Virtual Disk using Diskpart

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