GUI - cannot create thin pool

[pavels]

Hi,
I've found small issue regarding creating LVM thin pools via GUI.
Let's say, I have existing volume group. You can notice it's completely free space (no logical volumes exist on it).
--- Volume group ---
VG Name pro
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 17
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size <476.94 GiB
PE Size 4.00 MiB
Total PE 122096
Alloc PE / Size 0 / 0
Free PE / Size 122096 / <476.94 GiB
VG UUID fql46q-fC06-udcP-Wph8-a9K9-ishT-0o2o4g

But when I want to create thin pool, it says:


I'm not sure whether its a GUI bug or feature?
The only options are:
* create thin pool from command line.
* or remove volume group + physical volume and then it's possible to create thin pool via GUI.

 

[t.lamprecht]

I'm not sure whether its a GUI bug or feature?

It's a limitation, or if you want a "protection feature". Currently only fully empty (wiped) disks without any FS or the like on them can be used in the "create disks" dialogue. This was done to ensure that no important data could be overwritten.
It needs to gain a bit of "intelligence" to handle such cases as yours. Your specific one is even a bit more specific "issue", as for LVM Thin we only allow doing the full thing but not using an existing, but unused/empty, vg as base for a new LVM Thin pool..

You may want to open a enhancement request at https://bugzilla.proxmox.com/ to track this.