Description of problem:
create new storage with cache mode default not saved to guest.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Shut down a vm then open Virtual Machine Details window.
2.Click Add Hardware button
3.select Storage in left panel.
4.check "Select managed or other existing"
5.Browser an existing file
6.select Floppy disk as Device type.
7.Change Cache mode to default.
8.Click "Finish" button.
9.check Floppy 1 performance options
Cache mode change to none automatically.
Cache mode should same with step 7 setting.
this issue both occur on add IDE Disk,Virtio Disk,IDE CDROM storage
Thanks for the report, but for RHEL, 'none' is the default, so this is correct behavior. We have to hardcode this default in virtinst since qemu devs did not want to set it at the emulator level.
Closing as NOTABUG.