Removing failed swap drive

Here's an interesting one. If you're swapping to more than one drive 
(and it's not mirrored) and one of the drives fails, what do you do? 
Asking for a friend.

Okay, you can simply reboot but you might not want to. This leaves you 
with a failed swap device entry:

# swapctl -lh
Device:            Bytes      Used:
/dev/#C:0x65        4.0G       182M
/dev/ada1p2         4.0G       180M

Eh? Okay...

# swapoff "/dev/#C:0x65"
swapoff: /dev/#C:0x65: No such file or directory

Fair enough - I'd never heard of #C:0x65 either. Try the actual 
partition on the failed drive:

# swapoff /dev/ada0p2
swapoff: /dev/ada0p2: No such file or directory

Almost fair enough, as ada0 is fubar and offline. But as the system 
clearly has it in its list of swap devices, how else do you reference it?

I might try swapoff -a and disable all swapping, then add in the good 
one again but I don't know how it would react because I've never done 
this, and I don't want to bork it for various reasons - like it'll take 
me two days to get to the server and I've only so many layers of redundancy.

Thanks, Frank.