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

[Nemanja Miletic]

Hi,

Does anyone think that turning on journaling on files could help us
speed up the access to gfs partition?

This would be difficult because journaling can be turned on only on
files that are empty. We have a large number of empty files of active
users that download all their mail from pop3 server, so turning on
jurnaling for them should be possible. 

What size should be the journals when file journaling is on?

Thank You


On Mon, 2006-04-17 at 11:29 +0200, 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,
-- 
Nemanja Miletic, System Engineer
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