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Date: Fri, 14 Aug 2015 11:39:57 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Tim Daneliuk <tundra@tundraware.com>
cc: FreeBSD Stable Maling List <freebsd-stable@freebsd.org>
Subject: Re: Swap Questions
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On Fri, 14 Aug 2015, Tim Daneliuk wrote:

> I just built a 10.2 machine on a cloud-based VPS (Digital Ocean) that has
> 512M of memory and 1G of swap partition.  I am seeing a ton of errors like
> this:
>
> Aug 14 00:01:22 myhost kernel: swap_pager_getswapspace(10): failed
> Aug 14 00:01:22 myhost kernel: swap_pager_getswapspace(14): failed
> Aug 14 00:01:22 myhost kernel: swap_pager_getswapspace(11): failed
> Aug 14 00:01:22 myhost kernel: swap_pager_getswapspace(6): failed
> Aug 14 00:01:22 myhost kernel: swap_pager_getswapspace(7): failed
> Aug 14 00:01:22 myhost last message repeated 2 times
>
>
> So, I added this to fstab (after creating /usr/swap0):
>
> md99	none	swap	sw,file=/usr/swap0	0	0
>
> And then did this:
>
> swapon -aq
>
>
> But, when I do a swapinfo, all I can see is the "disk" swap partition
> that comes standard with the VPS:
>
>
> Device          1K-blocks     Used    Avail Capacity
> /dev/gpt/swapfs   1048576   456572   592004    44%

Add the -L (late) option to swapon.  How this works might differ between 
10-Release, 10-Stable, and 11.

Incidentally, md99 does not have to be literal, it's just meant to get 
the md device number up out of the way of common interactive usage of 
mdconfig.