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Linux / Centos 6.5 SSD Best Practice

Posted on 2014-04-07
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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
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Question by:bimrock
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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
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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.
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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.
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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.
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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.
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Author Comment

by:bimrock
ID: 40052663
Yes the file system is ext4
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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.
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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.
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