resizing proxmox disk to make it smaller.
- Thread starter Joe_F
- Start date
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- Tags
- disk resize disk
in short NO
Reason: the host cannot know the filesystem and therefore know which part is used.
extending is easier as it simply makes the file bigger and set the information about it
workarounds: prefered way is using zfs with thin provisioning, prefably on a ssd or nvme.
with that you have to use scsi as guest disc, activate discard and ssd emulation.
with that: after trimming your windows diskt (disk optimization) youll see imidaitly used space will go down.
ofc you need to keep an eye once you overprovision with thin
)the hard way:
you make a new disk with the desired space
shrink the partition in the guest to desired size (or a bit less)
boot with cdrom and a cloning tool / partition copy - copy over the whole disk from big file to small file.
detach original disk and boot from new small disk, if ok then delete old disk
...
i use by default 50gig imiages on thin prov. on zfs as default for winserver, only get more or additional disks where needed.
its a bliss. real worl usage is 10gig per blank win2012srv while they had initially 18gig after install and doing updates.
nothing better then sending a diskcelaup command to all guests at once cross cluster and see diskusage drop like a stone on Precious nvme storage