On 7 December 2014 at 15:33, William Harrington <[email protected]>
wrote:

>
> > On Dec 5, 2014, at 13:50, Richard Melville <
> [email protected]> 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.
> >
> > Richard
>
> Swap needs a device to enable swap. If you are using USB and the boot
> scripts, which the system will load real fast from an SSD (even a hard
> drive) where the rootfs is, the USB device may not be available. You will
> need to use rootdelay option in kernel to make sure the USB device settle
> down (just like the scsi system, usb operates like the scsi system without
> waiting for root), so that swap will be able to be enabled.
>
> You have two options when using USB parittions to mount. Use rootdelay or
> use an initramfs even if your rootfs is not with the USB device. You can
> even put a delay in the swap script until the usb device becomes available.
>

Thanks William -- I'm using rootdelay.  I started with rootdelay=10, but
I'd managed to reduce it to "1" without swap.  A rootdelay=5 allows swap to
become enabled, but I still had to create S60swap in rcS.  I'd like to keep
rootdelay to as low a figure as possible, and with swap enabled "5" seems
to be that figure.

Yes, I could place a delay in the swap script, but what's the difference
between doing that and just running the script at a later time with
S60swap?  The latter option seems to be cleaner and simpler.

Regarding an initramfs, that's something I've been avoiding, and
successfully thus far.  As I say, I'd rather keep things simple, if at all
possible.

Richard
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