Hi,
I have a virtual system created using qemu 7.2. In that system, I
attached/hot plugged a virtual NVMe drive. This drive had a default
block size of 512 bytes.
admin@node-3:~$ sudo nvme list
Node SN Model
Namespace Usage Format FW
Rev
--------------------- --------------------
---------------------------------------- ---------
-------------------------- ---------------- --------
/dev/nvme0n1 ashudev-6f34a1cf_13 QEMU NVMe Ctrl
1 34.36 GB / 34.36 GB 512 B + 0 B
7.1.92
After that, I formatted this drive with 4k block size and it formatted
successfully.
admin@node-3:~$ sudo nvme format /dev/nvme0n1 -f --lbaf 4
Success formatting namespace:1
admin@node-3:~$
admin@node-3:~$ sudo nvme list
Node SN Model
Namespace Usage Format FW
Rev
--------------------- --------------------
---------------------------------------- ---------
-------------------------- ---------------- --------
/dev/nvme0n1 ashudev-6f34a1cf_13 QEMU NVMe Ctrl
1 34.36 GB / 34.36 GB 4 KiB + 0 B
7.1.92
Then, I just performed the hot plugout and then plugin operation on
that drive using qmp.execute's device_del and device_add cmd
respectively.
But, after that, the default block size of that drive reverted to 512 bytes.
admin@node-3:~$ sudo nvme list
Node SN Model
Namespace Usage Format FW
Rev
--------------------- --------------------
---------------------------------------- ---------
-------------------------- ---------------- --------
/dev/nvme0n1 ashudev-6f34a1cf_13 QEMU NVMe Ctrl
1 34.36 GB / 34.36 GB 512 B + 0 B
7.1.92
So, I just wanted to know why the NVMe format type reverted back to
512 bytes, as I just performed the hot plugout/plugin operations only.
Drive's block size (format type) should not be changed upon
removal/insertion, right ? or am I missing something ?
Regards,
Ashutosh
