[Linux-cluster] problems with 8 node production gfs cluster

[Rainer Duffner]

Nemanja Miletic wrote:
> Hello,
>
> I am working for major ISP and we have gfs cluster deployed for our mail
> system. Cluster includes six smtp and two pop3 nodes. Nodes are on blade
> servers, and are accessing FC HP EVA 5000 storage. Whole cluster is on
> the same gigabit subnet. Partition that holds mailboxes is shared. We
> are using gentoo linux distribution with 2.6.16-gentoo-r1 kernel and
> 1.02 linux-cluster.  
>
> We have a problem that in busy hours reading and writing from gfs
> partition gets very slow. This causes many processes that need to use
> the disk to go in D state. This further causes great load (over 200) on
> the machines in the cluster. When we cut the pop3 and smtp access on the
> firewall load slowly decreases. At the moment we have a limit on syn
> connection on 110 port on our load balancers (LVS based) in order to
> control the load.
>
>
>
> Thank You,
>   



Out of personal interest: what MTA/MDA are you running?



cheers,
Rainer