Hyper-V online extended disk space summary

Recently encountered a problem with Hyper-V extended disk space, and by the way, take a moment to summarize the conditions and limitations of the appropriate extended disk space for each version of Windows Server. Share with you.

First of all, what is the most important for extended disk space? is not technically, because the expansion of disk space is really no technical content, the operation of the individual will be, the most important thing is how to not affect the service is running, that is, no downtime. However, not all versions of Hyper-V can extend disk space without downtime, and some of them must be shut down before they can expand disk space.

So how can you extend disk space without downtime? First of all, there are two prerequisites.

1.SCSI Controller

2.VHDX

Only these two conditions are met at the same time, you can do non-stop expansion of disk space.

SCSI controller This is what Hyper-V has long had, and hyper-V has two types of controllers

1.SCSI Controller

2.IDE Controller

This is a bit like the physical machine's disk interface, IDE interface or SCSI interface, the difference between these two interfaces in Hyper-V is that a Hyper-V virtual machine has two IDE interfaces, each IDE interface can hang two virtual hard disks, and the SCSI interface can have 4, Each SCSI interface can hang 64 hard disks, the gap is very large, and the SCSI interface speed is said to be faster than the IDE, but this is not measured.

VHDX is not in detail, this is a new release in Windows Server 2012

Next, look at the various versions of Windows Server support for these two conditions

Version	SCSI controller	VHDX
Windows Server R2 or lower	Supported, but not as a startup disk	Not supported
Windows Server 2012	Supported, but not as a startup disk	Support
Windows Server R2 Generation virtual machines	Supported, but not as a startup disk	Support
Windows Server R2 second generation virtual machines	Supported, IDE drives not supported	Supported, VHD files are not supported

So based on these support conditions we can summarize what Windows Server can do to extend disk space without downtime

Version	Whether the virtual disk can be extended without downtime
Windows Server R2 or lower	No, because VHDX is not supported
Windows Server 2012	Yes, but only the VHDX disks on the SCSI drive can be extended
Windows Server R2 Generation virtual machines	Yes, but only the VHDX disks on the SCSI drive can be extended
Windows Server R2 second generation virtual machines	Absolutely can

Here is a diagram I drew to help you understand

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This article is from the "Just Make It Happen" blog, so be sure to keep this source http://mxyit.blog.51cto.com/4308871/1690461

Hyper-V online extended disk space summary