Can I set a swap in zvol?

[Crivens]

I used to run swap on ZVOL for some years, without ill effects. And I had 4GB of RAM and build from source, ran memory hungry software, ...

What made me stop was that swap on ZVOL does not work with kernel core dumps, they will not get written. As I was doing some driver development then, I had to switch.

 

[rbranco]

It's not anecdotal. It still has issues:

Swap deadlock in 0.7.9 · Issue #7734 · openzfs/zfs

System information Type Version/Name Distribution Name Debian Distribution Version stretch Linux Kernel 4.16.0-0.bpo.2-amd64 Architecture amd64 ZFS Version 0.7.9-3~bpo9+1 SPL Version 0.7.9-3~bpo9+1...

github.com

 

[Crivens]

Is that still acute? And was it also active on FreeBSD?