On Fri, Sep 1, 2017 at 8:41 AM, Jim Kusznir <jim@palousetech.com> wrote:

Hi all:

I have several VMs, all thin provisioned, on my small storage (self-hosted gluster / hyperconverged cluster). I'm now noticing that some of my VMs (espicially my only Windows VM) are using even MORE disk space than the blank it was allocated.

Example: windows VM: virtual size created at creation: 30GB (thin provisioned). Actual disk space in use: 19GB. According to the storage -> Disks tab, its currently using 39GB. How do I get that down?

I have two other VMs that are somewhat heavy DB load (Zabbix and Unifi); both of those are also larger than their created max size despite disk in machine not being fully utilized.

None of these have snapshots.

How come you have qcow2 and not raw-sparse, if you are not using snapshots? is it a VM from a template?

Generally, this is how thin provisioning works. The underlying qcow2 doesn't know when you delete a file from within the guest - as file deletion is merely marking entries in the file system tables as free, not really doing any deletion IO.

You could run virt-sparsify on the disks to sparsify them, which will, if the underlying storage supports it, reclaim storage space.

You could use IDE or virtio-SCSI and enable DISCARD support, which will, if the underlying storage supports it, reclaim storage space.

Those are not exclusive, btw.

How do I fix this?

Thanks!
--Jim

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