On 5 December 2014 at 20:27, Bruce Dubbs <[email protected]> wrote:

> Richard Melville wrote:
>
>> Just a point of information: the swap script set to run at S20swap in
>> /etc/rc.d/rcS.d comes up too soon and displays an error message, but
>> S60swap works OK.
>>
>> Obviously, working with USB flash media slows everything down a tad.
>> Maybe
>> the run order could be changed in the book; I can't see that it would
>> effect anybody else adversely.
>>
>
> This is the first time I've seen this.  I agree that putting swap at the
> end of rcS wouldn't affect anything, but I'm not sure why that is
> necessary.  After all / is already mounted so the disk should be available.
>
> Do you have swap on a drive separate from the / partition?
>
> I'll note that if your system actually uses swap, then the speed of the
> process is really slowed.  Actual use of swap on a USB flash system would
> be truly awful.  IMO, no swap at all would be better.
>
> I'm open to changing when swap is initiated, but question if it's really
> needed.


Yes, swap is on a separate USB flash partition, but it's not used (I have
8GB of RAM), and / is on an SSD.  The main reason for the swap partition is
for hibernate; I'm running desktop computers and servers from external
batteries.

I realise that this is an unusual setup, but I wouldn't claim it to be
unique.  The SSDs are formatted with btrfs, and btrfs doesn't support swap
so I had to place it somewhere else.  As I use USB flash drives for
booting, and /boot is only 100MB, it made sense to me to use some of the
otherwise wasted capacity for swap/hibernate.  As I say, swapping hasn't
been necessary thus far, and hibernate is a failsafe in case a battery
dies, so, again. probably rarely used (he says in hope).

Richard
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