On 6 December 2014 at 16:35, Bruce Dubbs <[email protected]> wrote:
> Richard Melville wrote: > >> 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). >> > > I wonder if you could use a swap file for hibernation? Swap files certainly support hibernation but I'm not sure how that would help me. Btrfs doesn't support swap files, at least, not at present :-( Are you saying that, maybe, a swap file would be a better solution than a swap partition on the USB flash drive? On my bootable flash drive I do have a third partition with a copy of a stripped-down BLFS as a rescue OS, which, handily, uses all the remaining flash drive capacity. As the second swap partition exists primarily for hibernation I didn't want to point the rescue OS to it, so I created a small swap file on the third (rescue OS) partition, mainly as a test. In terms of timing, it appears to react in much the same way as the swap partition. In other words, I still had to adjust rcS to S60swap. Richard
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