I try to add three SSDs as journal disks to an existing Storage Space (with powershell commands Add-PhysicalDisk and Set-PhysicalDisk -usage journal).

However strangely this increased the size of the storage pool (get-storagepool | select size).

How can I detect whether the added disks are really used for Parity Journal and Write Back Cache? Or is it not possible to add this to an already existing storage space?


Get-PhysicalDisk PowerShell cmdlet is your best friend. Loop over all disks in your system checking "-Usage" parameter. For journal disks it will be "Journal" (surprise!). If there are no "Journal" disks detected your pool isn't using journalling disks.


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