Saw I/O errors while delete/create/attach a namespace on nvme device.

[Wen Xiong]

> What exactly are you doing?  To the Linux host code this looks like the
> NGUID changed for an existing namespace.  Are you deleting and
> recreating nsid1 rapidly and the controller is assigning a different
> nguid?

Hi Christoph,

Good morning!

Yes. controller assigned a difference nguid to a namespace.

Steps:
Executed nvme detach-ns /dev/nvme0 --namespace-id=1 --controllers=0x81
Executed nvme delete-ns /dev/nvme0 --namespace-id=1
Executed nvme create-ns /dev/nvme0 --nsze=1562805846 --ncap=1562805846 
--flbas=0 -dps=0 -nmic=1
Executed nvme attach-ns /dev/nvme --namespace-id=1 --controllers=0x81

Saw NGUID changed and IO errors when executing attach-ns command.

Thanks a lot!
Wendy