How can I shrink a ZFS / RAW disk?

[Razva]

Hey,

I have a 1TB RAW disk (rpool/data/vm-101-disk-0) on a ZFS pool (local-zfs) that I want to shrink to 256 GB. The VM uses cloud-init.

The real usage is about 15 GB, so there's plenty of space to shrink.

I've tried to do a zfs set volsize=256G rpool/data/vm-101-disk-0 which works, but the OS breaks. So then I tried to boot the VM with a LiveCD, resize /dev/sda1 to 100 GB and to the zfs set volsize. The OS breaks.

Can you please let me know how to do it? I can convert to QCOW if necessary.

Thank you!

 

[Razva]

Sorry for bumping this, any hints? Thanks!

 

[bbgeek17]

Before you attempt to reduce the underlying disk you first need to understand if the filesystem inside your VM can handle reduction.
Shrinking the filesystem is always a sensitive topic, some filesystems can be shrunk safely, others cant.
At a high level, starting from inside the VM: shrink the filesystem, reduce the partition, then attempt to shrink the disk.
Almost none of it is PVE specific, plug each piece with identifying information (xfs,ext[2-4),etc) into google and make sure you have backups.

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