Note: I'm using a Samsung 830 SSD (migrated OS from defunct PC) and other than these two (interrelated?) problems it's working fine. Surprisingly well actually. Motherboard is a ASUS P8Z77-V Deluxe.
Problem 1: Crashdumps are not working. volmgr throws an event 45 "The system could not sucessfully load the crash dump driver." whenever you modify crashdump settings, or if a crashdump occurs. diskpart says that "Crashdump disk = no" which is peculiar.
Problem 2: Hibernation isn't working. Again, volmgr throws the same event 45 if you try to hibernate. The screen blanks, then you're at the password prompt. No sleepage occurs. (Yes, I know I should avoid hibernation on SSDs but it's enabled and the hibernation file is definitely there so I'd like to know why it's failing). Diskpart claims "Hibernation file = no" which is again peculiar... it's plainly there and getting created by the system.
The common factor appears to be volmgr and/or the crashdump "service" (if that's what it is). I'd much rather get this working than spend days reinstalling and reconfiguring the entire system, especially when it's working perfectly otherwise. Sleep works as well (as long as it's not hybrid sleep).
So, what defines the flags "Crashdump disk" and "Hibernation file disk" in diskpart's output? And what might be going wrong that's breaking crashdumps in particular?