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Configuring a system for zram
Short version, I got the thing I was working on in the meeting to
actually work correctly. The end result is here:
Longer version, to enable zram without using Puppet, drop this script in
/lib/udev/zram (and make sure it is executable):
Drop a file like this in /etc/udev/rules.d/01-zram.rules:
KERNEL=="zram*", ACTION=="add", RUN=="/lib/udev/zram 105388441"
The number at the end will be the size of the swap devices in bytes.
Create /etc/modprobe.d/zram.conf with the following contents:
options zram num_devices=4
The number of devices needs to match the number of CPU cores in the
Finally, run "modprobe zram". Eventually, you should see something like
this in /proc/swaps:
Filename Type Size Used Priority
/dev/zram1 partition 102916 0 32767
/dev/zram3 partition 102916 0 32767
/dev/zram2 partition 102916 0 32767
/dev/zram0 partition 102916 0 32767
Note that there is a dependency on systemd in the zram.sh script, so you
need to be on a reasonably modern distribution if you want everything to
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