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[http://talk.maemo.org/showthread.php?t=84296 SDCard Partition Methods Thread]
= Talk on Dual SD Swap Method =
See from post 67 - sixwheeledbeast

== Swap Switching Scripts ==

=== Latest Version - sixwheeledbeast ===

swapswitch.sh
<pre>

#!/bin/sh

# Made by sixwheeledbeast, Malkavian, Estel and vi_

# Setup swap names for script

## Swap 0 - Backup internal swap location
swap0=/dev/mmcblk0p3
echo $swap0

## Swap 1 - First Main Swap Location
swap1=/dev/mmcblk1p2
echo $swap1

## Swap 2 - Second Main Swap Location
swap2=/dev/mmcblk1p3
echo $swap2

# Get Current Swap
swap=`cat /proc/swaps | awk '/dev/ {print $1}'`
echo $swap

# Go root
s=sudo
echo $sudo

# Setup notification banner
banner(){
o=org
f=freedesktop
n=Notifications
run-standalone.sh dbus-send --type=method_call \
--dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
}

#Print Current Swap Pre
banner "$swap"

sleep 5

#Logic
if [ "$swap" = "$swap1" ] ;
then
   nice -20 $s swapon $swap2
   nice -20 $s swapoff $swap1
elif [ "$swap" = "$swap2" ] ;
then
   nice -20 $s swapon $swap1
   nice -20 $s swapoff $swap2
elif [ "$swap" = "$swap0" ] ;
then
   nice -20 $s swapon $swap1
   nice -20 $s swapoff $swap0
else
   banner "Swap Switch Failed"
fi

sleep 5

# Get Current Swap
swappost=`cat /proc/swaps | awk '/dev/ {print $1}'`
echo $swappost

#Print Current Swap Post
banner "$swappost"

</pre>

swapswitchejectsd.sh
<pre>

#!/bin/sh

# Made by sixwheeledbeast, Malkavian, Estel and vi_

# Setup swap names for script

## Swap 0 - Backup internal swap location
swap0=/dev/mmcblk0p3

## Swap 1 - First Main Swap Location
swap1=/dev/mmcblk1p2

## Swap 2 - Second Main Swap Location
swap2=/dev/mmcblk1p3

# Get Current Swap
swap=`cat /proc/swaps | awk '/dev/ {print $1}'`
echo $swap

# Go root
s=sudo
echo $sudo

# Setup notification banner
banner(){
o=org
f=freedesktop
n=Notifications
run-standalone.sh dbus-send --type=method_call \
--dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
}

#Print Current Swap Pre
banner "$swap"

sleep 5

#Logic
if [ "$swap" = "$swap0" ]
then
   banner "Swap on Internal already!"
elif [ "$swap" = "$swap1" ]
then
   nice -20 $s swapon $swap0
   nice -20 $s swapoff $swap1
elif [ "$swap" = "$swap2" ]
then
   nice -20 $s swapon $swap0
   nice -20 $s swapoff $swap2
else
   banner "Swap Switch Failed"
fi

sleep 5

# Get Current Swap
swappost=`cat /proc/swaps | awk '/dev/ {print $1}'`
echo $swappost

if [ "$swappost" = "$swap0" ]
then
      banner "Safe to remove back cover"
else
sleep 2
      banner "ERROR! DO NOT REMOVE BACK COVER"
sleep 3
#Print Current Swap Post
       banner "$swappost"
fi

</pre>

=== Version 1 - Malkavian ===

swapswitch.sh
<pre>
#!/bin/sh

# Made by Sixwheeledbeast and Malkavian

# Setup swap names for script
## Swap 0 - Backup internal swap location
swap0=/dev/mmcblk0p3
## Swap 1 - First Main Swap Location
swap1=/dev/mmcblk1p2
## Swap 2 - Second Main Swap Location
swap2=/dev/mmcblk1p3

# Setup notification banner
banner(){
o=org
f=freedesktop
n=Notifications
run-standalone.sh dbus-send --type=method_call \
--dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
}

# Get Current Swap
old=`cat /proc/swaps | awk '/dev/ {print $1}'`

#Logic
if [ "$old" = "$swap0" ]
  then if [ $RANDOM -lt 16384 ] # RANDOM gives a value from 0 to 32787. We try 50% of probabilities
    then new="$swap1"
    else new="$swap2"
  fi
elif [ "$old" = "$swap1" ]
  then new="$swap2"
elif [ "$old" = "$swap2" ]
  then new="$swap1"
else banner "None of the configured swaps found active, revise the configuration. Current active swap (if any): $old"
     exit 1
fi

swapon $new || \
  ( banner "Ops, something failed, cannot swapon $new (so swapoff of $old neither done)" && exit 1 )
nice -20 swapoff $old || \
  ( banner "Ops, something failed, swapon of $new done but cannot swapoff $old" && exit 1 )
banner "OK: Swap switched from $old to $new"

</pre>

swapscriptejectsd.sh

<pre>
#!/bin/sh

# Made by Sixwheeledbeast and Malkavian

# Setup notification banner
banner(){
o=org
f=freedesktop
n=Notifications
run-standalone.sh dbus-send --type=method_call \
--dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
}

# Get Current Swap
old=`cat /proc/swaps | awk '/dev/ {print $1}'`

#Logic
if [ "$old" = "$swap0" ]
  then banner "Swap on Internal already!" 
       exit 0
  else swapon $swap0 || \
         ( banner "Ops, something failed, cannot swapon $swap0 (so swapoff of $old neither done)" && exit 1 )
       nice -20 swapoff $old || \
         ( banner "Ops, something failed, swapon of $swap0 done but cannot swapoff $old" && exit 1 )
fi
</pre>

== Information on Starting Swap on SD at bootup ==

Upstart format - new file in event.d

etc/event.d/relocateswap
<pre>
description "Micro SD Swap Location on Startup"
author "sixwheeledbeast"

console output

start on started rcS-late

script
        swapon /dev/mmcblk1p2        
        sleep 10
        swapoff /dev/mmcblk0p3
end script

</pre>

==Original script from main page==
This script can be run via [[Terminal]] or using an application like [[Queen BeeCon Widget]].

It is for refreshing swap if main swap space is on Micro SD Partition 2.

run-standalone.sh dbus-send --type=method_call --dest=org.freedesktop.Notifications /org/freedesktop/Notifications org.freedesktop.Notifications.SystemNoteDialog string:"Start Swap Refresh" uint32:0 string:"OK"; sudo swapon /dev/mmcblk0p3 ; sudo swapoff /dev/mmcblk1p2 ; run-standalone.sh dbus-send --type=method_call --dest=org.freedesktop.Notifications /org/freedesktop/Notifications org.freedesktop.Notifications.SystemNoteInfoprint string:"Swapping Back to Main Swap on SD..." ; sudo swapon /dev/mmcblk1p2 ; sudo swapoff /dev/mmcblk0p3 ; run-standalone.sh dbus-send --type=method_call --dest=org.freedesktop.Notifications /org/freedesktop/Notifications org.freedesktop.Notifications.SystemNoteDialog string:"Swap Refresh Complete" uint32:0 string:"OK"

This script can be modified to suit different swap locations as required.

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Editing Talk:Swap on microSD

@@ Line 6: / Line 6: @@
 === Latest Version - sixwheeledbeast ===
-Now uses "EOF gainroot" script, although this causes multiple banner messages in the ejectsd script, not sure how to fix.
-The first switching script works perfectly and fixes the multiple swapping due to a reorder.
-swapswitch.sh
-<pre>
-#!/bin/sh
-#Made by sixwheeledbeast, Estel, Malkavian, peterleinchen and vi_
-# Setup swap names for script
-## Swap 0 - Backup internal swap location
-swap0=/dev/mmcblk0p3
-echo $swap0
-## Swap 1 - First Main Swap Location
-swap1=/dev/mmcblk1p2
-echo $swap1
-## Swap 2 - Second Main Swap Location
-swap2=/dev/mmcblk1p3
-echo $swap2
-# Go root if not
-if [ `id -u` != 0 ] ; then
-    exec  | sudo gainroot <<EOF
-exec sh $0 $*
-EOF
-          exit $?
-fi
-# Setup notification banner
-banner(){
-o=org
-f=freedesktop
-n=Notifications
-run-standalone.sh dbus-send --type=method_call \
---dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
-}
-# Get and Print Current Swap Pre
-swap=`cat /proc/swaps | awk '/dev/ {print $1}'`
-echo $swap
-banner "$swap"
-sleep 5
-#Logic
-if [ "$swap" = "$swap1" ] ;
-then
-   nice -20 swapon $swap2
-   nice -20 swapoff $swap1
-elif [ "$swap" = "$swap2" ] ;
-then
-   nice -20 swapon $swap1
-   nice -20 swapoff $swap2
-elif [ "$swap" = "$swap0" ] ;
-then
-   nice -20 swapon $swap1
-   nice -20 swapoff $swap0
-sleep 5
-# Get and Print Current Swap Post
-swappost=`cat /proc/swaps | awk '/dev/ {print $1}'`
-banner "$swappost" && exit 1
-else
-   banner "Swap Switch Failed" && exit 1
-fi
-#End of Logic
-</pre>
-swapswitchejectsd.sh
-<pre>
-#!/bin/sh
-##Made by sixwheeledbeast, Estel, Malkavian, peterleinchen and vi_
-# Setup swap names for script
-## Swap 0 - Backup internal swap location
-swap0=/dev/mmcblk0p3
-## Swap 1 - First Main Swap Location
-swap1=/dev/mmcblk1p2
-## Swap 2 - Second Main Swap Location
-swap2=/dev/mmcblk1p3
-# Setup notification banner
-banner(){
-o=org
-f=freedesktop
-n=Notifications
-run-standalone.sh dbus-send --type=method_call \
---dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
-}
-# Get and Print Current Swap Pre
-preswap=`cat /proc/swaps | awk '/dev/ {print $1}'`
-banner "$preswap"
-sleep 5
-#Logic
-if [ "$preswap" = "$swap0" ];
-then
-   banner "Swap on Internal already" && exit 1
-elif [ "$preswap" = "$swap1" ];
-then
-# Go root if not
-if [ `id -u` != 0 ] ; then
-          exec | sudo gainroot <<EOF
-exec sh $0 $*
-EOF
-         exit $?
-fi
-   nice -20 swapon $swap0
-   nice -20 swapoff $swap1
-sleep 3
-swappostswitchone=`cat /proc/swaps | awk '/dev/ {print $1}'`
-banner "$swappostswitchone"
-sleep 2
-banner "Safe to remove back cover" && exit
-elif [ "$preswap" = "$swap2" ];
-then
-# Go root if not
-if [ `id -u` != 0 ] ; then
-          exec | sudo gainroot <<EOF
-exec sh $0 $*
-EOF
-         exit $?
-fi
-   nice -20 swapon $swap0
-   nice -20 swapoff $swap2
-swappostswitchtwo=`cat /proc/swaps | awk '/dev/ {print $1}'`
-banner "$swappostswitchtwo"
-sleep 2
-banner "Safe to remove back cover" && exit
-else
-   banner "Swap Switch Failed"
- sleep 2
-   banner "DO NOT REMOVE BACK COVER - Please check swaps manually via terminal" && exit 2
-fi
-</pre>
-=== Version 1 - sixwheeledbeast ===
 swapswitch.sh