[Linux-cluster] Write Performance Issues with GFS2

[Adam Drew]

Hello,

There's multiple reasons such things could be happening and though both of you see similar symptoms the underlying causes may be different. I highly suggest opening cases with Red Hat Support if you are Red Hat customers.

As far as what it could be... well, there's a lot to pick from. One thing that comes to mind is:

https://bugzilla.redhat.com/show_bug.cgi?id=683155

But that depends on the size of the file being written vs. rgrp size. Lock contention is also a possibility of course. I'd start with that bug and go from there. Again, Red Hat Support may be able to really assist you in this.

Thanks,
Adam Drew

----- Original Message -----
> On Mer, 11 Maggio 2011 10:34 pm, Ramiro Blanco wrote:
> > Hi,
> >
> > I have a 4 node cluster running gfs2 on top of a EMC SAN for a while
> > now, and since couple of months ago we are randomly experiencing
> > heavy
> > write slowdowns. Write rate goes down from about 30 MB/s to 10 kB/s.
> 
> Hi!
> 
> i've got a similar issue. In may case for example, an SCP copy begin
> with
> 30MB/s but after about 15 minuts it is less then 300Kb/s
> 
> Why?
> 
> 
> --
> Andrea Modesto Rossi
> Fedora Ambassador
> 
> 
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