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Server 2012R2 - Thin provisioned out of space when 14TB still available

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Hi,

Suspect this is a configuration error but I can't see where.

Original system install was Server 2012 Data Center with six 3TB disks (showing as 2.73TB each). Storage Pool was created with ReFS out of the six disks. 5 disks were set as AUTOMATIC and 1 as HOT SPARE, the storage pool is configured as PARITY layout with THIN provisioning and a capacity of 40.0TB.

System was upgraded a month ago to a new install of Server 2012R2 Data Center on new hardware (Supermicro X9DRi-LN4+ with dual 8 core CPUs and 128GB or RAM). System boot drive is a 128GB SSD. Drives were installed in the new server and Storage Pool was recognized fully accessible.

System was running low on disk space, so 4 new 3TB drives identical to the ones already installed, were added to the storage pool and usage was configured as AUTOMATIC for each.

The problem is that the Storage Pool claims to be out of space. We cannot copy files to it "Out of space" message is given.

In the storage pools window the capacity reported is 27.3TB, free space 12.9TB, percent allocated bar is roughly 50%. When looking at properties for the pool it reports 14.4TB is used. So the math adds up.

When we right click on the disks in the Physical Disks window the following information is provided:

Disk 0 - 405GB used
Disk 1 - 405GB used
Disk 2 -   2.73TB used
Disk 3 -   2.73TB used
Disk 4 - 256MB used
Disk 5 -   2.73TB used
Disk 6 -   2.73TB used
Disk 7 -   2.73TB used
Disk 9 - 256MB used
Disk10 - 256MB used

In the Virtual Disks window layout reported is PARITY, provisioning THIN, capacity 40.0TB and Allocated 11.5TB. Version of the Storage Pool was upgraded to Windows Server 2012 R2.

The actual amount of data on the drives is just about 11.5TB.

This appears to be an allocation problem, but I've looked everywhere to find a way to allocate the available disk space in the pool but I cannot find a place to do so. Everything I've read to date says "allocation is automatic" and that there are no specific settings to allocate space. Server was rebooted several times.

Any suggestions would be greatly appreciated.

E.


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