[Linux-cluster] clvm problems with multiple clusters in same vlan

[Steffen Plotner]

> -----Original Message-----
> From: linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Ramon 
> van Alteren
> Sent: Thursday, April 26, 2007 6:59 AM
> To: linux clustering
> Cc: System Administration
> Subject: [Linux-cluster] clvm problems with multiple clusters 
> in same vlan
> 
> Hi list,
> 
> We're having problems with running multiple clusters in the same vlan.
> For some reason clvmd refuses to start properly.

I am currently running 2 redhat clusters in the same VLAN using the same
IP range with different netmasks however (i.e. each cluster in its own
subnet, both on the same VLAN). So far, I have not seen any clvmd
issues.

Steffen

> 
> We think (but cannot completely confirm) that clvm is 
> informed by the clvmd on the other cluster about volumegroups 
> which it can't reach because it can't reach the underlying 
> storage / physical volumes.
> 
> The sympotoms are:
> 
> node fails on reboot with hung clvmd daemon no output from 
> clvmd even when started with debug  (clvmd -d)
> 
> versions:
> Cluster LVM daemon version: 2.02.09 (2006-08-17)
> Protocol version:           0.2.1
> 
> cman_tool 1.03.00 (built Oct 19 2006 10:58:21) Copyright (C) 
> Red Hat, Inc.  2004  All rights reserved.
> 
> ccsd 1.03.00 (built Oct 19 2006 10:58:17) Copyright (C) Red 
> Hat, Inc.  2004  All rights reserved.
> 
> The node does join the cman cluster group and the defined fence group.
> If the second cluster is shutdown nodes reboot without problems.
> 
> We're considering to force ccs to use different ports [1] for 
> communication as a workaround, any other options or 
> suggestions would be highly appreciated.
> 
> Best regards,
> 
> Ramon van Alteren
> 
> 
> [1] man ccsd:
> 
>       -P <port identifier>:<port number>
>               You have the option of specifying the port 
> numbers used by ccsd.  The port identifier is  either:
>               b,  c,  or  f.   "b"  is the port which ccsd 
> attempts to 
> communicate with ccsd processes on other
>               machines, via broadcast/multicast, to obtain or 
> validate its config file (cluster.conf).  This is
>               known  as  the  backend  port.  "c" is the base 
> port number of two consecutive ports used by ccsd
>               processes to communicate cluster membership 
> information.  
> This is known as the cluster base port.
>               "f"  is  the  port number that listens for 
> information requests from the CCS library (or programs
>               using it).  This is known as the frontend port.
> 
>               So, to change the frontend port one might 
> specify -P f:60000.
> 
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