Existe muita documentação sobre o uso de HDs SSD no LINUX. Algumas são antigas e outras pouco detalhadas.
Bem pesquisei várias documentações em diversos sites e baseado nas que achei mais interessantes criei um script para ser usado no Debian. Este script foi testado no Debian 8 Jessie mas imagino que possa funcionar bem no Wheezy e também no Ubuntu e Linux Mint devido a semelhança destes sistemas.
#!/bin/bash
# edmarcos antonio de souza
# contato arroba edeg.com.br
# 20150704
# http://stackoverflow.com/questions/18596778/difference-between-using-chmod-ax-and-chmod-755
# http://unix.stackexchange.com/questions/37313/how-do-i-grep-for-multiple-patterns
# http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/
# https://en.opensuse.org/SDB:SSD_performance
# https://wiki.freeswitch.org/wiki/SSD_Tuning_for_Linux
# https://wiki.archlinux.org/index.php/Solid_State_Drives
# fstrim -------------------------------
test -x /etc/cron.weekly/dofstrim || {
echo "#!/bin/sh
#
# To find which FS support trim, we check that DISC-MAX (discard max bytes)
# is great than zero. Check discard_max_bytes documentation at
# https://www.kernel.org/doc/Documentation/block/queue-sysfs.txt
#
# http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/
for fs in \$(lsblk -o MOUNTPOINT,DISC-MAX,FSTYPE | grep -E '^/.* [1-9]+.* ' | awk '{print \$1}');
do
fstrim -v \"\$fs\"
done" > /etc/cron.weekly/dofstrim
chmod a+x /etc/cron.weekly/dofstrim
}
# swappiness ---------------------------
echo "# https://en.opensuse.org/SDB:SSD_performance
vm.swappiness=1
vm.vfs_cache_pressure=50" > /etc/sysctl.d/30-ssd.conf
# scheduler ----------------------------
# https://wiki.archlinux.org/index.php/Solid_State_Drives
test -f /etc/udev/rules.d/60-scheduler.rules || {
echo "# set deadline scheduler for non-rotating disks
ACTION==\"add|change\", KERNEL==\"sd[a-z]\", ATTR{queue/rotational}==\"0\", ATTR{queue/scheduler}=\"deadline\"
# set cfq scheduler for rotating disks
ACTION==\"add|change\", KERNEL==\"sd[a-z]\", ATTR{queue/rotational}==\"1\", ATTR{queue/scheduler}=\"cfq\"" > /etc/udev/rules.d/60-scheduler.rules
}
# fstab --------------------------------
FSTAB=/etc/fstab
IFS_CURRENT=$IFS
IFS=$(echo -en "\n\b")
# noatime
for i in `cat $FSTAB | grep -w "ext[3-4]" | grep -v "noatime"`
do
OPTIONS=$(echo $i | awk {'print $4'})
LINE=$(echo $i | sed s/$OPTIONS/$OPTIONS,noatime/g)
sed -i "s|$i|$LINE|" $FSTAB
done
# commit=600
for i in `cat $FSTAB | grep -w "ext[3-4]" | grep -v "commit=600"`
do
OPTIONS=$(echo $i | awk {'print $4'})
LINE=$(echo $i | sed s/$OPTIONS/$OPTIONS,commit=600/g)
sed -i "s|$i|$LINE|" $FSTAB
done
IFS=$IFS_CURRENT
Abaixo o link para o script.
Faça o download do mesmo renomeie a extensão .txt para .sh , de permissão de execução para o mesmo e execute.
task-ssd
