[Linux-cluster] GFS performance.

[Jeff Sturm]

> -----Original Message-----
> From: linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Vikash 
> Khatuwala
> Sent: Monday, April 20, 2009 11:23 AM
> To: linux-cluster at redhat.com
> Subject: [Linux-cluster] GFS performance.
> 
> OS : CentOS 5.2
> FS : GFS

Can you easily install CentOS 5.3 and GFS2?  GFS2 claims to have some
performance improvements over GFS1.

> Now I need to make a decision to go with GFS or not, clearly 
> at 4 times less performance we cannot afford it, also it 
> doesn't sound right so would like to find out whats wrong.

Be careful with benchmarks, as they often do not give you a good
indication of real-world performance.

Are you more concerned with latency or throughput?  Any single read will
almost certainly take longer to complete over GFS than EXT3.  There's
simply more overhead involved with any cluster filesystem.  However,
that's not to say you're limited as to how many reads you can execute in
parallel.  So the overall number of reads you can perform in a given
time interval may not be 4x at all (are you running a parallel
benchmark?)

Jeff