Optimize SSD on Linux

After installing the SSD on your laptop, there are some adjustments that need to be done so that it is optimal. I'm using Fedora 30

File system

My Partition is:

Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Disk model: Samsung SSD 860
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: DF4E716F-F00A-40F3-8176-C97A52F36998

Device Start End Sectors Size Type
/dev/sda1 2048 253951 251904 123M EFI System
/dev/sda2 253952 976773119 976519168 465.7G Linux LVM

And logical volume are: Root, Home, Archive, VM, Games

Format as ext4 with default block size (4096 best for SSD), and set reserved block to 1%

# mkfs.ext4 -L Home -m 1 /dev/VG/YourHome

Copying

I did not reinstall linux but only made partitions and copied files from the old disk.
Hard links and sparse files may cause disk usage larger on target, use -S and -H. And for ACL and extended attributes use option -A -X

# rsync -avAXSHx /source /target

Grub config

Mount EFI and update grub config:

# mount /dev/sdb1 /mnt/boot/efi
# grub2-mkconfig -o /mnt/boot/efi/EFI/fedora/grub.cfg

Update grub config and initramfs again after you successfully boot using new disk

Disable swap

Edit /etc/fstab and remark line contains swap

# swapoff -a

Enable zram swap

# dnf install zram
# systemctl enable zram-swap.service

Edit /etc/zram.conf to tune up, i use this setting to avoid thrashing:

FACTOR=10

# reboot

Set vm swappiness

# vim /etc/sysctl.d/80-custom.conf
vm.swappiness = 1

# sysctl -p /etc/sysctl.d/80-custom.conf

Edit mount option in fstab

add to / and /home mount option: noatime but don't add discard

Use tmpfs

Fedora use tmpfs by default, to check: mount | grep tmpfs

Use weekly trim

# systemctl enable fstrim.timer

LVM

Set "issue_discards" option in /etc/lvm/lvm.conf for LVM if you want LVM to discard on lvremove

Change io scheduler

I use tlp, so I edit /etc/default/tlp

DISK_IOSCHED="deadline deadline"

Dirty page values

Also edit in tlp setting:

MAX_LOST_WORK_SECS_ON_AC=600
MAX_LOST_WORK_SECS_ON_BAT=600

Disable coredump

Edit /etc/systemd/coredump.conf

[Coredump]
Storage=none

Firefox config

Open URL about:config
Then Accept the Risk

Change sessionstore.interval to 1500000

Update, this really lower disk writes:

dnf install profile-sync-daemon

As user run:

psd p

#edit config if necessary

systemctl --user start psd

systemctl --user enable psd

Chrome cache

...

Virtual Machine

Use qcow2 image, SCSI disk, virtio-scsi controller and enable TRIM

MISC

Find remaining life

# sudo smartctl -a /dev/sda

Find Remaining_Lifetime_Perc or Media_Wearout_Indicator or Wear_Leveling_Count

Find out which process write too much

# sudo iotop -aP

Press left cursor twice to sort Disk Write

Or using gnome system monitor:

Samsung DC Tool

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