Removing SSDs from tier in Storage Services

Currently I have a single JBOD set up with 4 ssd's and 10 hdd's

they have a pool and a disk set up which is live and runs around 15 vms.

I want to add 2 more JBOD's to this pool so I can handle an enclosure failure, however I need to put 2 of the 4 SSD's into another JBOD as I only have 6 SSD's

Is there a way for me to safely remove 2 of the SSD's in my original JBOD so I can then just expand the pool / disk to include my 2 new JBOD's

I have tried setting the disks as retired but I get the below error message

S C:\Users\m1ke hunt> Set-PhysicalDisk -FriendlyName 'PhysicalDisk20' -Usage Retired
Set-PhysicalDisk : Not Supported
At line:1 char:1
+ Set-PhysicalDisk -FriendlyName 'PhysicalDisk20' -Usage Retired
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (StorageWMI:ROOT/Microsoft/..._StorageCmdlets) [Set-Physical
   Disk], CimException
    + FullyQualifiedErrorId : StorageWMI 1,Set-PhysicalDisk
 

any help is appreciated.
LVL 6
CaptainGibletsAsked:
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Gerald ConnollyCommented:
Screen shots of the setup might be useful?
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CaptainGibletsAuthor Commented:
Here are screenshots / powersehll requests from a machine in the cluster.

If you need anything else please let me know.
cluster-disk.png
Disk-Details.txt
getvirtualdisk.png
Pool-Details.txt
remove-disk.png
retire-disk.png
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
The six SSDs are tiered and bound to virtual disks within the current JBOD?

A bit of a monkey wrench in the mix on two counts:

1: The additional two JBODs should be configured exactly the same as the original. So, six SSDs in each additional one.

2: There is _no_ rebalance process in Storage Spaces on 2012 R2. There will be in 2016 with the command set hopefully ported back to 2012 R2 but for now it's a no go.

What does that mean? When you add the two new JBODs the "simplest" method to get things to where you want to is to back everything up and start fresh with the three JBODs. Benefit of doing it this way is the ability to move the SSDs about as required.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Error Message
That message is telling you exactly what is going on.

I wasn't too clear in my previous post: You _cannot_ remove the SSD permanently since it is a part of a Pool and storage tier.

Where is the Witness?
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CaptainGibletsAuthor Commented:
Sorry for not closing this down, Philip Elder's answer is the correct one.
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Gerald ConnollyCommented:
Author acknowledges Philip Elders Post as the solution
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