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How to shrink a Cluster shared volume

Posted on 2016-11-26
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Last Modified: 2016-12-09
Hi Experts

Is it possible to shrink a cluster shared volume (csv) in windows server 2016?

I have a windows server 2016 environment with hyper-converged storage spaces direct deployment. It's four node cluster.

I accidentally increased the performance tier instead of the capacity tier.

I used the following powershell cmd:

Get-VirtualDisk "Disk1" | Get-StorageTier | ? Friendlyname -eq "Disk1_Performance" | Resize-StorageTier -Size 200GB


I need to shrink the performance tier. The resize cmd only works to extend the tier.

Thanks for your help.
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Question by:SGTA14
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Philip Elder earned 500 total points
ID: 41903578
Flash and spindle or all flash?

The simplest thing to do is to set up a new virtual disk with the configuration you want, CSV, and finally Storage Live Migrate the VHDX file(s) to the newly configured CSV. Once that is done delete the incorrectly configured one to reclaim the storage.

IIRC, the suggested ratio is 1:10 performance to capacity tier.
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by:SGTA14
ID: 41903611
Hi Philip

Thanks for the an answer. We are using NVme (Journal) + SSD Drives for our setup.

Regards SGTA
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by:Philip Elder
ID: 41903625
What are you using for your East-West traffic (S2D to S2D node)?
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by:SGTA14
ID: 41903627
We are using two Mellanox 10Gb network adapters per nodes. So its a 20Gb connection. At the moment we have four nodes in a cluster. (Hyper-converged S2D Deployment)

The problem that I have is, that i have to take down the VMs for a Storage Migration and that the migration takes quite a bit of time. We are running several VMs on that affected CSV.
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by:Philip Elder
ID: 41903631
Storage Live Migration does _not_ take the VMs offline. It is run while they are online. Just like Live Migration of a VM between nodes. There is no loss of storage uptime.

Right click on a VM --> Move --> Storage --> VHDX files --> New Location --> Done.
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by:SGTA14
ID: 41903634
I have to do it through VMM, am I right?

I can not find a storage migration option in the failover cluster manager snap in, but i have the option in VMM.
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by:Philip Elder
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In FCM right click on the VM --> Move --> Storage --> Choose files --> Choose Destination --> GO
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