note sdc corner case when resizing ganeti

└─sda1   8:1    0  10G  0 part /

sdb      8:16   0   2G  0 disk [SWAP]

sdc      8:32   0  40G  0 disk /srv

```

If `sdc` is the resized disk, the kernel might not have noticed the

size change, and you might need to kick it. There might be easier

ways, but a reboot would sure do it:

    reboot

And in that case, the partition is *already* resized, so you do not

need to go through the `fdisk` process below and jump straight to the

last `resize2fs` step.

We use fdisk on the device:

```