apt-get update 
apt-get upgrade
rpi-upate

Modifier /etc/default/tmpfs pour mettre tmp en ram

wipefs -a /dev/sdi2
mkfs.f2fs -t 1 -l root /dev/sdi2
ionice -c 3 rsync -avHAXx /mnt/ALIX/base/ROOT/ /media/roger/root/

Editer fstab:

/dev/mmcblk0p2  /               f2fs    defaults,noatime,discard  0       1

Editer /boot/cmdline.txt

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=f2fs elevator=deadline fsck.repair=yes rootwait

Etat de la mémoire:

free -htl

Mise en place du swap ou état:

dphys-swapfile setup

Déactivation:

dphys-swapfile swapoff

Supression

dphys-swapfile uninstall
systemctl disable dphys-swapfile

/etc/apache2/mods-enabled/mpm_prefork.conf

<IfModule mpm_prefork_module>
      StartServers                     1
      MinSpareServers           0
      MaxSpareServers          1
      MaxRequestWorkers         5
      MaxConnectionsPerChild   0
</IfModule>