Swap Questions

[Tim Daneliuk]

On 08/14/2015 12:39 PM, Warren Block wrote:
> 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.


So -L does fix the problem - sort of.  The machine picks up the file as
additional swap on boot just fine.  HWOEVER, when I try to reboot or shut
down the host, I get a panic telling me some noise about not being able
to shutdown swap for some reason.

So ... I decided to just add a second disk partition for swap and -
for some reason - it works fine interactively, but upon reboot,
the newly created swap partition no longer exists and gpart shows
the space as free again.  I tried a gpart commit, but get 
"operation not permitted".  So now I am trying to figure out
how to make gpart changes stick.  This may be an artifact of
the way Digital Ocean droplets are set up ....

Grrrrrrrr

-- 
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Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/