How Do You Handle SSD's

cachedrive · 05-31-2015, 04:49 PM

I'm wondering how the CentOS 7 community handles SSD's? Do you just slam them in, load XFS on them and move along or do you do other things? Being that XFS is the new default FS for CentOS, I assume there's been some considerations for SSD performance support. I just don't know what those are.

Do I need to somehow specify TRIM support for my CentOS 7 installation? I know the kernel supports it however I assume there needs to be some configs set in /etc/fstab, no?

Head_on_a_Stick · 05-31-2015, 05:02 PM

Modern SSDs need no special treatment, their longevity is better than the average spinning rust drive.
http://techreport.com/review/27909/t...heyre-all-dead

You can enable TRIM automatically by adding "discard" to the "options" section in /etc/fstab but this will slow down your drive.

I use a systemd .timer to apply fstrim periodically; I don't use CentOS so I'm not sure how that would translate.

TobiSGD · 06-01-2015, 04:11 AM

Quote:

Originally Posted by Head_on_a_Stick

I use a systemd .timer to apply fstrim periodically; I don't use CentOS so I'm not sure how that would translate.

Since version 7 CentOS also uses systemd, so your .timer unit should be usable there. too.

Head_on_a_Stick · 06-01-2015, 04:25 AM

^ Thank you

Here it is:

Code:

# /usr/lib/systemd/system/fstrim.timer
[Unit]
Description=Discard unused blocks once a week
Documentation=man:fstrim

[Timer]
OnCalendar=weekly
AccuracySec=1h
Persistent=true

[Install]
WantedBy=multi-user.target

Enable it with:

Code:

# systemctl enable fstrim.timer

You will need fstrim (obviously):

Code:

# yum install fstrim

The .timer unit may be supplied with the package so check before making a new one.