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RE: [Linux-cluster] dissapointed with GFS performance



RedHat Performance FAQ
http://kbase.redhat.com/faq/FAQ_78_3152.shtm

GFS Performance Tuning
http://sourceware.org/cluster/faq.html#gfs_tuning

Mount with noatime
http://man.chinaunix.net/linux/redhat/rh-gfs-en-6.0/s1-manage-atimeconf.html

Turn off disk quotas
http://www.redhat.com/archives/linux-cluster/2006-August/msg00237.html



-----Original Message-----
From: linux-cluster-bounces redhat com [mailto:linux-cluster-bounces redhat com] On Behalf Of Alexandre Racine
Sent: Friday, August 24, 2007 9:24 AM
To: linux clustering
Subject: RE: [Linux-cluster] dissapointed with GFS performance



You'll never have the same performance with remote data and local data.
You can test those with real numbers if you want. You can try those two hard drive benchmark programs : bonnie++ and iozone.

I am actually working on improving performance right now.

Where to begin:
-Do you have a 1000gbs link?
-Do you use jumbo frames?

You also have to know what your software is actually doing. Reading 1 text file or 2000? You did not post your gfs version, but I know that there was a patch lately for directory listing that was sooo slow.




Alexandre Racine
Projets spéciaux
514-461-1300 poste 3304
alexandre racine mhicc org



-----Original Message-----
From: linux-cluster-bounces redhat com on behalf of Brad Filipek
Sent: Fri 2007-08-24 10:14
To: linux clustering
Subject: [Linux-cluster] dissapointed with GFS performance
 
Is there any way to "tune" gfs so that it will run faster? I have a GFS
partition with data on it which our internal order system accesses. It
is a text based (command line) driven application which is installed on
the local disks, and accesses the data through the /data directory which
is mounted on the GFS partition. When I run the program, I can notice
latency between menu changes. To confirm that it is GFS causing the
latency, I created an ext3 partition on my SAN, unmounted /data from the
GFS partition, then mounted /data to the newly created EXT3 partition. I
placed the exact same data on this EXT3 partition, fired up my
application, and it whips through menu changes instantly. This tells me
that the SAN is fast, but GFS is not. 

 

What can I do to speed up GFS, or is this just the way it is? 

 

Thanks, 

Brad Filipek



 


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