For a deeper look, can you please attach screenshots and UI+engine logs?
I was trying to reproduce now in similar ways not able to create the problem.... I will search for logs
Gianluca
you see in extract of engine.log here:
first step of editing the second disk "c8_Disk2" of VM c8 with success at 2020-03-12 09:51:28,680+01
error (WARN line) related to attempt of editing the boot disk named "c8_boot" of the same VM at 2020-03-12 09:51:40,359+01 with reason:
Validation of action 'UpdateVmDisk' failed for user tekka@my_domain@my_domain. Reasons: VAR__ACTION__UPDATE,VAR__TYPE__DISK,ACTION_TYPE_FAILED_VM_IS_NOT_DOWN
second attempt (after doing similar actions on disks of another VM named c8client) that had success for the same disk "c8_boot" of VM c8 at 2020-03-12 09:52:15,928+01
Gianluca