ZFS and thin provisioning

[Jecode]

Hi,

I've tried to search answer how to properly configure my VM disk, so it doesn't hog the whole allocated space at once.

I have setup ZFS storage on my Proxmox as RAID10, by size of 4TB.

I created a VM for my Ubuntu install, and when I select my ZFS storage for storage, only available option for "Format", is "Raw disk image". I believe this causes the VM to allocate whole 1024GB on initialization, despite of actual space used is ~15GB.

What I might be doing wrong with my ZFS setup, so it forces the disk format to "Raw", which I believe causes VM to allocate all the space on init?

 

[ucholak]

hi,
check datacenter/storage/sas-storage zfs properties

 

[Jecode]

hi,
check datacenter/storage/sas-storage zfs properties

Ah! Damn that was well hidden! I tried to look storage properties from my proxmox instance "Disks"-section, since that's where I went and created the storage. I would think that it would be smart to have that "Thin provision"-option available directly where you are able to create the storage.

I wonder if there's option to "trim" the existing disk that VM has provisioned, or do I have to recreate the VM with new disk?

 

[Azunai333]

I wonder if there's option to "trim" the existing disk that VM has provisioned

Allow "Discard" in the VM config. Then trim the disk from inside the VM.
For example in Linux:
fstrim -av