[Dovecot] Best Cluster Storage

[Henrique Fernandes]

[]'sf.rique


On Fri, Jan 21, 2011 at 2:14 AM, Stan Hoeppner <stan at hardwarefreak.com>wrote:

> Henrique Fernandes put forth on 1/20/2011 11:55 AM:
>
> > Even the storage system is not SUN those ocfs2 servers are connect via
> iSCSI
> > from the storage with ocfs2 in virtual machine
>
> Storage are an EMC CX4 ( don't have all info about it right now )


> Please provide a web link to the iSCSI storage array product you are using,
> and
> tell us how many 1GbE ports you are link aggregating to the switch.
>

Just one, the EMC have one interface and we are exporting iSCSI over it.
Right now is what we can do, we are waiting to be able to buy an SUN to make
everything works.

>
> Also, are you using Oracle OCFS2 or IBM GPFS?  You mentioned both.
>  Considering
> you are experiencing severe performance issues with metadata operations due
> to
> the distributed lock manager...
>
> OCFS2 1.4  Because it is free. Have no money for anything else, we have
considered swith it to NFS.


> Have you considered SGI CXFS?  It's the fastest cluster FS on the planet by
> an
> order of magnitude.  It uses dedicated metadata servers instead of a DLM,
> which
> is why it's so fast.  Directory traversal operations would be orders of
> magnitude faster than what you have now.
>
> http://en.wikipedia.org/wiki/CXSGI CXFSFS<http://en.wikipedia.org/wiki/CXFS>
> http://www.sgi.com/products/storage/software/cxfs.html
>

We don't considerd buying an clustered filesystem.

We are out of ideias to make it faster. We only came up making more ocfs2
cluster with smaller disks. With this we are gettng better performance. We
have now 2 cluster one with 4 TB other with 1 TB and are migrating some os
emails form 4TB to 1TB and already have ready another cluster with 1 TB. So
we have 3 machines and those 3 mount 3 disks each from the storage and mount
3 ocfs2 cluster. So we think the each DLM gets less work.  Are we right?

Thanks!



> --
> Stan
>