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Re: pi vs swap on flash

On Thursday 13 July 2017 12:00:43 Alan Corey wrote:

> Mine looks like:
> proc            /proc           proc    defaults          0       0
> /dev/sda1  /boot           vfat    defaults          0       2
> /dev/sda2  /               ext4    defaults,noatime  0       1
> /dev/sda3 none swap sw 0 0
Reading the manpage, I used:
/dev/sda2 none swap sw,defaults
And after a reboot, htop shows swap at 2099 megs. That includes the 100 
meg swapFILE in /var. To turn that off:
sudo dphys-swapfile swapoff
or sudo dphys-swapfile swapon

I just turned it off. That I think can be put into /etc/rc.local as it 
runs as root.  But I can't make that work, without or with a sudo in 
front of it. So where can I put it?.

I turned it off, then removed /var/swap. Won't reboot. WTH? THere isn't 
anything in fstab but what I added, and nothing in /boot/config.txt or 
cmdline.txt about swap. I can recover, but the most recent edits in the 
linuxcnc tree haven't been backed up, damn!!!!! I'll try a full 
powerdown before I swap cards to begin the recovery.

> And when you reboot you should see it in top as an increase in swap.
> The only downside I've found is that piclone doesn't know to ignore
> it.  I put mine at the end of 320 GB, now I can't use piclone for
> backups to SD anymore.  But there's been discussion that swap will
> wear out an SD fast, they're rated by read/write cyccles.

Eggzakly. :)

Thanks Alan.

Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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