Resized differential drives causes guest crash

[Kamil Jońca]

I wanted to resize (expand) guest hard drive. So:

1. I made snapshot of guest
2. resize snapshot vdi file with VBoxManage modifyhd ~/vb/vm/work/deuter/Snapshots/\{5c558b0f-1ea6-4c48-92e0-9095747529b1\}.vdi --resize 20000
3. tried to resize windows partition on disk.

And guest start to behave undeterministic.

• with gparted ran in guest I saw a lot disk error messages
• windows guest (which normally works in this machine) aborts in random moments

Seems that "use host IO cache" has some impact on this (witch cache on, machine aborts earlier)