flashcache.sh

sudo aptitude update && sudo aptitude install -y build-essential checkinstall git dkms

git clone -b stable_v3.1.1 https://github.com/facebook/flashcache.git
cd flashcache

sudo make -f Makefile.dkms

sudo cp -v ./utils/flashstat /usr/sbin/

hdd=sda3
ssd=sdb

sudo tee /etc/init/flashcache.conf <<EOF
# flashcache - flashcache enabler
#

description     "Reenable writeback cached drives"

start on starting mountall

task

script
    /sbin/flashcache_load /dev/${ssd:-sdb}
end script
EOF

# sudo flashcache_destroy /dev/$ssd
sudo flashcache_create -p back cachedev /dev/$ssd /dev/$hdd

sudo tee -a /etc/sysctl.d/30-flashcache.conf <<EOF
dev.flashcache.${ssd:-sdb}+${hdd:-sda3}.fast_remove = 1
EOF

sudo sysctl dev.flashcache.${ssd:-sdb}+${hdd:-sda3}.fast_remove=1

cat /etc/sysctl.conf
sudo sysctl -p /etc/sysctl.conf

file=/etc/lvm/lvm.conf
test -f ${file}.orig || sudo cp -v $file ${file}.orig
sudo sed -Ei "$(($(grep -En "^\s*filter =" $file|cut -d : -f 1) +1)) i \
\    filter = [ \"r|/dev/${hdd:-sda3}|\" ]
" $file
sudo sed -Ei "0,/^\s*filter/{s/(^\s*)(filter.*)$/\1# \2/}" $file
sudo update-initramfs -u