[K12OSN] noatime mount option for better performance

Michael Blinn mblinn at peopleplaces.org
Tue Aug 14 15:16:33 UTC 2007

Forgive the lateness; I've been on vacation.

I've used 'defaults,noatime' for my /boot /var and /usr/local/ 
partitions since I built the server last year. It works well, and from 
my tests cuts the load significantly.

I started with /var/ because I do a lot of DB stuff, and that's where 
MySQL keeps its things by default, as well as log files
/usr/local/ is where my custom anti-spam and imap servers are
/boot/ I just threw in there as an afterthought. I'll try /tmp/ next. I 
definitely can't use /home/ because I have backup scripts that compare 
file modification timestamps, though I imagine there are a host of other 
reasons not to.

I do imagine I'll eventually run into some weird error that is caused by 
a program looking for a timestamp change, I just haven't found it yet.


Robert Arkiletian wrote:
> On 8/9/07, Robert Arkiletian <robark at gmail.com> wrote:
>> On 8/9/07, James P. Kinney III <jkinney at localnetsolutions.com> wrote:
>>> From a performance aspect, the potential in LTSP is huge. Everytime a
>>> client reads a file that runs the user interface, a disk write must also
>>> happen if atime is on. From a standpoint of system control, do you
>>> _really_ need to know when someone read a file? Maybe in a high-security
>>> environment but in a school?
>> Exactly.
>>> Currently most system use mount options as defaults which are
>>> default options: rw, suid, dev, exec, auto, nouser, and async
>>> so change an fstab line from
>>> LABEL=/home  /home ext3 defaults 1 2
>>> to:
>>> LABEL=/home /home ext3  rw,suid,dev,exec,auto,nouser,async,noatime  1 2
>> How about just
>> LABEL=/home  /home ext3 defaults,noatime 1 2
>> also (for clarity) other mount points would benefit too.
> Here are some interesting links
> http://wiki.centos.org/HowTos/Disk_Optimization
> http://www.ghidinelli.com/2006/01/17/postgres-812-benchmarks/
> http://www.ghidinelli.com/workspace/postgres/postgres_20060116.html
> I'm weighing the risk vs benefit of data=writeback


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