ssd.md

change scheduler, cfq is designed for rotational disks

/sys/block/sda/queue/scheduler set to deadline or noop

use tmpfs to reduce ssd write

vim fstab

tmpfs /tmp tmpfs rw,noatime,nosuid 0 0

mount

for ssd partitions

UUID=... / ext4 defaults,discard,noatime,commit=300 0 0

where 'commit' is just optional, 'discard' is useful. 'noatime' reduces write activated by atime record.

Redirect write

Deal with directories e.g.

$ rm -r .cache
$ ln -s /dev/shm .cache

Use fstrim

$ sudo fstrim /

reference

https://wiki.archlinux.org/index.php/Solid_State_Drives https://wiki.debian.org/SSDOptimization

hint

to identify SSDs,

find /sys | grep rotational

then

find /sys | grep rotational | xargs cat

and

if rotational = 0 then
	it is ssd
else if rotational = 1 then
	it is not ssd, but a hard disk
fi