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Klaus Hartnegg
Asked: 2019-01-11 08:53:57 +0800 CST

Howto verify if Storage Spaces uses Journal disks

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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?

windows-server-2016

2 Answers

  1. 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.

    https://docs.microsoft.com/en-us/powershell/module/storage/get-physicaldisk?view=win10-ps

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  2. I use this to verify Journal on my parity space for my F: drive (serialnumber / uniqueid omitted here, only 26 GB at the end of the the SSD are used for the Journal, the rest is a normal drive):

    PS C:\> Get-StoragePool -FriendlyName Pool-F | Get-PhysicalDisk | ft FriendlyName,MediaType,HealthStatus,canpool,CannotPoolReason,size,uniqueid,SerialNumber,Usage
FriendlyName            MediaType HealthStatus canpool CannotPoolReason          size Usage
------------            --------- ------------ ------- ----------------          ---- -----
WDC WD30EFRX-68AX9N0    HDD       Healthy        False In a Pool        3000592982016 Auto-Select
WDC WD30EFRX-68AX9N0    HDD       Healthy        False In a Pool        3000592982016 Auto-Select
Samsung SSD 860 EVO 4TB SSD       Healthy        False In a Pool        4000787030016 Journal
ST33000651AS            HDD       Healthy        False In a Pool        3000592982016 Auto-Select
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