7.2-STABLE: swap on ZFS v13

[Gary Jennejohn]

On Tue, 23 Jun 2009 03:01:53 -0700 (PDT)
Simun Mikecin <numisemis at yahoo.com> wrote:

> Before ZFS v13 import to the 7-STABLE branch, it was a well known fact that swap on ZFS volume (zvol) will not work.
> Recently, I tried to use swap on ZFS v13 (7-STABLE/amd64). It seems that it works.
> 
> I used 4k for the volblocksize as that is equivalent to hardware page size.
> I tried with compression enabled and disabled. Enabling compression reduces number of bytes that need to be swapped in and out to the zvol.
> 
> zfs create -o volblocksize=4k -o compression=on -o org.freebsd:swap=on -V 4g tank/swap
> swapon /dev/zvol/tank/swap
> 
> Is there anybody else who tried 7-STABLE/amd64 with swap on ZFS v13? Does it work or not?
> 

I doubt that you can generate a crash dump using ZFS as swap, especially
if you have compression enabled.

But I might be wrong.

Does anyone know?

---
Gary Jennejohn