root@ubuntu:~# /var/lib/cloud/instance/scripts/part-001
============== /dev/vda ===========
size: 4612096
queue/logical_block_size: 512
queue/physical_block_size: 512
queue/optimal_io_size: 0
queue/minimum_io_size: 512
# sfdisk --list /dev/vda
Disk /dev/vda: 2.2 GiB, 2361393152 bytes, 4612096 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0008c631

Device     Boot Start     End Sectors  Size Id Type
/dev/vda1  *     2048 4612062 4610015  2.2G 83 Linux
=============== end /dev/vda ====================
============== /dev/vdb ===========
size: 16777216
queue/logical_block_size: 4096
queue/physical_block_size: 4096
queue/optimal_io_size: 4096
queue/minimum_io_size: 4096
# sfdisk --list /dev/vdb
Disk /dev/vdb: 8 GiB, 8589934592 bytes, 2097152 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
=============== end /dev/vdb ====================
root@ubuntu:~# blockdev --getss /dev/vda
512
root@ubuntu:~# blockdev --getss /dev/vdb
4096