Issue with swap file

[Andre Goree]

On 12/04/2014 11:18 am, Lowell Gilbert wrote:
> Andre Goree <andre at drenet.net> writes:
> 
>> On 12/03/2014 5:10 pm, Lowell Gilbert wrote:
>>> Andre Goree <andre at drenet.net> writes:
>>> 
>>>> Several months ago, I followed the procedure here[1] for creating a
>>>> swap file.  This worked great for a long time, up until my last 
>>>> reboot
>>>> which coincided with an update to 10.1.
>>>> 
>>>> agoree at fbsd10-atl ~ % grep swap /etc/fstab
>>>> md99            none            swap    sw,file=/usr/swap 0     0
>>>> agoree at fbsd10-atl ~ % sudo swapon -a
>>>> swapon: mdconfig (attach) error: md99 on file=/usr/swap
>>>> 
>>>> I've also tried zero-writing the file again, to no avail.  Any 
>>>> ideas?
>>>> 
>>>> [1] https://www.freebsd.org/doc/handbook/adding-swap-space.html
>>> 
>>> Strange, I haven't run into any problems. And annoying that the error
>>> message is so unhelpful. When that error message gets printed, swapon
>>> has tried to run mdconfig and gotten an error back, but has no idea
>>> what
>>> the problem was. At that point, it has already checked that the md
>>> device is available, which eliminates my best guess at a diagnosis.
>>> 
>>> The way you can get more information is by running the mdconfig 
>>> command
>>> by hand, just as swapon would have, and see what *it* reports to you.
>>> 	mdconfig -a -t vnode -n -f /usr/swap
>>> 
>>> Very likely, it will tell you exactly what to fix.
>> 
>> I tried creating a new one (hence the '/usr/swap0' vs. '/usr/swap' in
>> the output below) and still got the same error.  Here's the
>> [disheartening] output from the command you gave:
>> 
>> agoree at fbsd10-atl ~ % sudo swapon -a
>> swapon: mdconfig (attach) error: md99 on file=/usr/swap0
>> agoree at fbsd10-atl ~ % sudo mdconfig -a -t vnode -n -f /usr/swap0
>> 0
> 
> Okay, that means mdconfig can attach the file to an md device. That
> eliminates my next guess, which was that md support wasn't working for
> some reason (such as not being in your kernel configuration).
> 
> The only difference I can see is the unit number, which I forgot to
> include in the command. Maybe if you try
>  	mdconfig -a -t vnode -n -f /usr/swap -u 99
> that will fail with an informative error message. If that doesn't help,
> I'm baffled.

Progress perhaps being made.

agoree at fbsd10-atl ~ % sudo mdconfig -a -t vnode -n -f /usr/swap0 -u 99
mdconfig: ioctl(/dev/mdctl): Device busy
agoree at fbsd10-atl ~ % swapinfo
Device          1K-blocks     Used    Avail Capacity
agoree at fbsd10-atl ~ %

Wtf? This is the newly created file too...

-- 
Andre Goree
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