qcow2 growing to fill host storage

spacebass

Active Member
Feb 25, 2019
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hey folks,
I have a FreeBSD guest VM with a qcow2 disk set to 2gb. The actual qcow2 is currently 3.6TB. It has grown to the point that other VMs are pausing due to I/O errors (the host is literally out space). I deleted some ISOs and got enough space to keep things running. But I'm down to the wire.

On the QCOW2 disk in question, I have 'discard' enabled and 'ssd emulation' enabled.

I've confirmed the trim is enabled in the guest.

The guest file system is ZFS.

Anyone have any tips? I'm not sure there's much I can do. This is a hosted machine so I can't add physical storage. I can add NFS storage at some expense, but I'd be willing to do that for a month and migrate some files if there's a way to shrink this thing so I can keep running.

What tips does this group have for shrinking this never-ending QCOW2 file?
 

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