[Linux-cluster] Did you use GFS with witch technology?

Andrew A. Neuschwander andrew at ntsg.umt.edu
Tue Jun 30 18:26:14 UTC 2009

The tick divider first showed up in RHEL 5.1. It is a kernel command 
line option. Search for 'divider' in the release notes 

Multicast works fine for me. I have 4 virtual and 1 physical members in 
my gfs cluster. The VMs are split onto two ESX nodes (along with 20+ 
other VMs). The physical/virtual ethernet switching works fine. But I 
did make sure the GFS VMs are using the vmxnet driver, as it has a lower 
latency than the other virtual nic driver. My gfs volumes consist of 
about 14TB of 4Gbps FC SAN LUNS.

Andrew A. Neuschwander, RHCE
Systems/Software Engineer
College of Forestry and Conservation
The University of Montana
andrew at ntsg.umt.edu - 406.243.6310

Tiago Cruz wrote:
> Hello Andrew! Many thanks for your reply!
> It's very good to see an environment like my!
> I'm using RHEL 5.2 with kernel-2.6.18-92.1.22.el5... can you explain a
> little bit around this trick divider?
> I'm usually have 2-3 IBM x3850 (16 cores CPU and 128 GB RAM) with 10-15
> virtual machines running under GFS, with a LUN ~500 GB SAN.
> My problem happens when Multicast:
> 	Switch -> GFS -> Switch = OK
> 	vSwitch (Box_A) -> Switch-> vSwitch (Box_B) = NOK
> Did you have some problem with? If I put all VMs inside the same box
> (vSwitch Box_A -> vSwitch Box_A) I don't have any problem...
> Thanks a lot!

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