Solved

Linux / Centos 6.5 SSD Best Practice

Posted on 2014-04-07
8
6,142 Views
Last Modified: 2016-11-23
Hi Guys,

I'm in the process of configuring a new laptop with Centos 6.5. The laptop has a SSD and I want to make sure that I have it configured correctly so as not to either damage, shorten lifespan, or degrade performance.

Based on what I read at:

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/Storage_Administration_Guide/index.html#ch-ssd

and

http://www.bit-integrity.com/2011/11/ssd-performance-tips-for-rhel6-and.html

I added the discard option to my fstab but that caused it not to boot with the error invalid partition table. As per the RedHat documentation I checked the /sys/block/sda/queue/discard_granularity file which has a value of 512.

After a reinstall, I moved /tmp to ram and so far my /etc/fstab looks like this:

#
# /etc/fstab
# Created by anaconda on Mon Apr  7 14:52:42 2014
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/vg_micron-lv_root /                       ext4    defaults        1 1
UUID=**** /boot                   ext4    defaults        1 2
/dev/mapper/vg_micron-lv_home /home                   ext4    defaults        1 2
/dev/mapper/vg_micron-swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
none                  /tmp                  tmpfs      defaults      0 0

----

1) How should I configure fstab to use trim (if possible)
2) Are there are other performance measures that I should take with the ssd? (and any links to how + I decided to keep the swap)

My hardware is a Dell E7240 w/ 8Gb Ram
0
Comment
Question by:bimrock
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
8 Comments
 
LVL 35

Assisted Solution

by:Seth Simmons
Seth Simmons earned 125 total points
ID: 39985019
this should explain things a bit more:

Is there TRIM support for SSD in RHEL6?
https://access.redhat.com/site/solutions/44477

Chapter 21. Solid-State Disk Deployment Guidelines
https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/ch-ssd.html
0
 

Author Comment

by:bimrock
ID: 39986637
Hi Seth,

Thanks for the response but I don't have a RH subscription... so I could not view the info in the 1st link.

Cheers.
0
 
LVL 14

Accepted Solution

by:
ThomasMcA2 earned 125 total points
ID: 40035618
To enable TRIM suport, add the "discard" option to fstab, like this:

UUID=b4ff9316-e1dc-4492            /disk2                   ext4 discard,user,noatime,nodiratime,errors=remount-ro 0 1

The noatime and nodiratime options are optional, but they help reduce the I/O to the drive, so I use them on my SSD.

Also, I don't think ext2 or ext3 support TRIM. Since I use ext4 anyway, that was not an issue for my drive.
0
What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

 

Author Comment

by:bimrock
ID: 40041244
Thanks ThomasMcA2,

I tried running similarly and it does not boot. I have the /, /boot, /home... all on that SSD. The only option that I was not using was errors=remount-ro. I'm not quite sure if there was something in particular that I missed. I actually had to reinstall and try twice both times I could not boot after adding the discard option.
0
 
LVL 14

Expert Comment

by:ThomasMcA2
ID: 40041253
Is the disk using ext4? I'm not sure how to find out from the console, but gparted will show you the file system type.
0
 

Author Comment

by:bimrock
ID: 40052663
Yes the file system is ext4
0
 
LVL 14

Expert Comment

by:ThomasMcA2
ID: 40054431
Have you tried a fresh install to the SSD using a LiveCD or LiveUSB stick? Maybe the fresh install will setup the SSD correctly.

My SSD is a 2nd drive that I don't boot from, so I'm not much help with boot-specific issues. Sorry.
0
 

Author Comment

by:bimrock
ID: 40085296
No worries... I can boot using a live stick... I am able to boot and use the disk just fine with Ext4 and Centos recognises that its a SSD...  it just that based on my reading I thought that using the DISCARD option was a good thing to do to reduce wear on the SSD. However, when I try using the options suggested and even those as per the RH documentation I cannot boot. I'm going to close out the question none the less and move on to other things.
0

Featured Post

Ransomware: The New Cyber Threat & How to Stop It

This infographic explains ransomware, type of malware that blocks access to your files or your systems and holds them hostage until a ransom is paid. It also examines the different types of ransomware and explains what you can do to thwart this sinister online threat.  

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article we have discussed the manual scenarios to recover data from Windows 10 through some backup and recovery tools which are offered by it.
The purpose of this article is to demonstrate how we can use conditional statements using Python.
Connecting to an Amazon Linux EC2 Instance from Windows Using PuTTY.
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
Suggested Courses

636 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question