Virtual Disk Software __HOT_

A virtual hard disk (VHD) is a disk image file format for storing the entire contents of a computer's hard drive. The disk image, sometimes called a virtual machine (VM), replicates an existing hard drive, including all data and structural elements. It can be stored in any location accessible to the physical host, and it is also transportable, meaning it can be stored and moved with a USB flash memory device.

A virtual hard disk has similar functionality to a physical hard disk drive. For example, it often contains the same hard drive sectors, such as a file system, disk partitions, etc. It also appears and operates like a hard disk that's physically connected to the system. Like a hard disk, the VHD can do the following:

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What differentiates the VHD from a physical hard disk is that it is designed for use by virtual machines and is installed on a virtual machine infrastructure, most commonly VMware Workstation and Hyper-V VMs.

While a VHD is created on a physical hard drive, it is a "virtualized" file and has its own logical distribution. Its disk size can be fixed or flexible. This size is managed by the operating system (OS) or virtualization manager.

A differencing VHD is used to create a copy of an existing disk. Two VHDs are used, a parent and a child. With a differencing VHD, it is possible to make changes to a parent VHD without altering that disk.

In Windows operating systems (8.1, 10, 11, Server 2016, Server 2012 R2, Server 2012), VHDs appear like physical disks in Disk Management utility. When a VHD is attached, it appears blue. If it is detached, the icon turns gray.

VHDX is functionally equivalent to VHD. However, it is an advanced version of VHD that supports larger storage capacity, larger logical sectors and live disk resizing. VHDX also provides the following advantages over VHD:

Despite these differences, both VHD and VHDX disk images are prone to file system corruption. This could be due to corrupted hard disk storage, suboptimal network conditions during file transfers or interference from antivirus programs. If a VHD or VHDX file is corrupted, a recovery tool can help recover some or all data.

See also: What types of VHD files does Hyper-V support?, what are the benefits of using the Boot to VHD feature?, PowerShell commands and other methods to resize VHDs and resizing a VHDX file without missing a beat. Explore: Can you create a dynamically expanding virtual hard disk?, set up a virtual hard disk and perform a Windows 10 dual boot and setting up virtual hard disk storage.

Virtual disks and virtual drives are common components of virtual machines in hardware virtualization, but they are also widely used for various purposes unrelated to virtualization, such as for the creation of logical disks.

A virtual drive is a software component that emulates an actual disk drive, such as an optical disc drive, a floppy disk drive, or a hard disk drive. To other programs, a virtual drive looks and behaves like an actual physical device.

In hardware virtualization, virtual machines implement virtual drives as part of their efforts to emulate the behavior of an actual machine. As with an ordinary computer, a virtual machine needs one virtual drive and one disk image to start up, except when it is performing a network boot. More virtual drives are added as needed.

Virtual optical drives are used on physical computers to transfer the contents of the optical disks onto hard disk drives. Doing so helps in resolving the problem of the short life span of CDs and DVDs and takes advantage of the faster data transfer rate of hard disk drives. However, virtual optical drives are also used for software piracy: early computer games used disc existence verification to ensure licensed use, which can be circumvented using virtual optical drives. As a countermeasure, the StarForce copy protection scheme attempts to thwart disc virtualization. Modern video games have migrated to online product activation as part of their distribution process.

With Disk Management you can create, attach, and detach virtual hard disks. Virtual hard disks (VHDs) are disk image file formats that have similar functionalities to a physical hard drive and are designed primarily for use with Hyper-V virtual machines.

VHDs appear just like physical disks in Disk Management. When a VHD has been attached and made available to the system for use, it appears blue. If the disk is detached and made unavailable, its icon reverts to gray.

Hi @Neil Cooper I have a few questions. Are these media agents physical or virtual? Would you be able to get one VM using the stable vmtools version (please make sure you are not using version 11269 issue reported here ( -Tools/11.0/rn/VMware-Tools-1105-Release-Notes.html)

Hi Neil,

Have you checked that Automount is disabled and the SAN policy is OfflineShared on the affected Media Agents?

Is there any AV on the Media Agents that could be scanning the attached disks or interfering with the CV Processes?

Have you tried mashing the F6 button when the virtual disk isn't recognised during initial setup? Then add the driver from your Raid ctl. On the good old days this was the way to go. Now they have all these fancy install helpers.

Well OP said he booted from USB but did not specify whether it was a USB obtained from Dell or one with an installation image he got somewhere else ?. Could still be a missing driver on his iso. If you don't detect the disk it's no big pain to try this before thinking it might be another problem. That plus the fact I don't like all the bloatware you get on those official support disks or installation media.

Hi,

I had a couple of days ago 2 HDs on the same virtual disk failing. The virtual disk is on raid 5 and had a spare. After replacing the 2 hard drives, it started to reconstruct the Raid and looks like failed yesterday, by giving me another error and by presenting 2 HDs as "Leftover". After searching on google, i cleaned the metadata of these hard drives and presented them again to the virtual disk and the reconstruction started again.

However it looks like during the night the reconstruction failed and for some reason the whole Virtual Disk went Offline!

Questions:

1. How can I bring it online?

2. It has now also 2 HDs as "leftovers", can I clear the metadata again and represent them?

I would advise against clearing the meta data and reusing the disks marked as leftover. These disks are faulty in some way and need to be replaced. I would arrange to get these disks swapped out and once replaced present them as spares.

However there was another disk in the same Vdisk with problems that would only show in the logs (not actually fail the disk) which caused the reconstruct to fail every time.

The only way around it was to get 2 replacement disks sent from HP (luckily was still in warrany) and delete the recreate the Vdisk and all its volumes, hence losing all your data!

There is a 'hidden' Trust option you can do in the CLI that lets you mount the Vdisk long enough for you backup any data, but its a one way ride, once you Trust it, the only thing left to do is delete and recreate...

I would highly suggest getting a replacement plan together. We had the same thing multiple times with both of our 2012i's and after 3 years of corrupt vdisks and calling support we finally just got rid of them.

Clicking to the right of "SATA Port 1" produces no virtual optical disc files in the VM folder. I looked in that folder, and the only files there are the VDI files and two other files, neither of which is the VOD file.

There is no VOD to select. Thus, I get the "FATAL: No bootable medium found! System halted" error. If I try to bypass the optical drive and boot from the virtual hard drive, I get a "FATAL: Could not read from the boot medium! System halted" error. So I can't run this VM yet.

Due to some limitation of the orchestrator we are using, we are able to attach only 2000GB disk to a VM. But since 2000GB is actually around 1.93T we were not able to attach additional disk to our Panoramas.

@Laurent_Dormond You can not extend the disk to more than 2TB. The disks need to be exactly 2TB and you can add upto 12. Even if you somehow mange to get it to work with incorrect disk size, it will cause you unexpected problems as the one you already had.

PMBx:

It depends on how the virtual disk was encrypted. If it was encrypted to a key, then the passphrase would be required to access the key, which would then access the virtual disk. If that key is gone, there will be no way to decrypt the data.

Peter, in your case it sounds like you might have the public key, but not the private key. The private key data is what is used for decryption, so without it, you will not be able to access the virtual disk. Make sure the entire keypair is present in your keyring.

The virtual disk backing object types describe the different virtual disk backings available. The disk format version in each case describes the version of the format that is used. Supported virtual disk backings: Sparse disk format, version 1 and 2 The virtual disk backing grows when needed. Supported only for VMware Server. Flat disk format, version 1 and 2 The virtual disk backing is preallocated. Version 1 is supported only for VMware Server. Space efficient sparse disk format The virtual disk backing grows on demand and incorporates additional space optimizations. Raw disk format, version 2 The virtual disk backing uses a full physical disk drive to back the virtual disk. Supported only for VMware Server. Partitioned raw disk format, version 2 The virtual disk backing uses one or more partitions on a physical disk drive to back a virtual disk. Supported only for VMware Server. Raw disk mapping, version 1 The virtual disk backing uses a raw device mapping to back the virtual disk. Supported for ESX Server 2.5 and 3.x. 006ab0faaa