PhilippeTeuwen: Created page with "==Resources== * http://www.linuxjournal.com/content/solid-state-drives-get-one-already ==TRIM== ===LUKS=== In /etc/crypttab, add the "discard" keyword for devices on SSDs: #T..."

2014-03-22T22:32:12Z

Created page with "==Resources== * http://www.linuxjournal.com/content/solid-state-drives-get-one-already ==TRIM== ===LUKS=== In /etc/crypttab, add the "discard" keyword for devices on SSDs: #T..."

New page

==Resources==
* http://www.linuxjournal.com/content/solid-state-drives-get-one-already
==TRIM==
===LUKS===
In /etc/crypttab, add the "discard" keyword for devices on SSDs:
#TargetName Device KeyFile Options
sda1_crypt UUID=... none luks,discard
===LVM===
In /etc/lvm/lvm.conf, add a line issue_discards = 1 in devices section:
<pre>
devices {
...
issue_discards = 1
..
}
</pre>
===initramfs===
sudo update-initramfs -u -k all
shutdown -r now
===Testing===
On ext4 fs:
fstrim <mountpoint>
Should return silently if no error
===Enabling===
Automatically by the fs: add "discard" in options in /etc/fstab
<br>Manually or via cron: run fstrim <mountpoint>
==Partitioning==
Make sure partitions are on a 512k boundary.
<br>fdisk and LVM handle it properly.
==Tuning==
* Add option "noatime" in /etc/fstab to avoid writes on SDD
* Avoid swap on SSD
* Avoid filling SSD, keep <80% for proper garbage collection and wear leveling
* No RAID (as they have no TRIM support)
* Bios: AHCI mode, not IDE emulation (slower, no TRIM)
==Health==
sudo smartctl -a /dev/<device>
"Media_Wearout_Indicator" => count down from 100 as the drive approaches the Flash wear limit

SSD - Revision history

PhilippeTeuwen: Created page with "==Resources== * http://www.linuxjournal.com/content/solid-state-drives-get-one-already ==TRIM== ===LUKS=== In /etc/crypttab, add the "discard" keyword for devices on SSDs: #T..."