[Linux-cluster] RHCS evaluation

Digimer lists at alteeve.ca
Mon Aug 27 16:57:56 UTC 2012

Virtual Machines run really well on KVM; Both Windows (using the virtio
"scsi" bus) and Linux guests. I moved from RHEL 5 to RHEL 6 specifically
for VM performance reasons.

The tutorial I linked does indeed cover VMs. The main thing you would
change is that, instead of using DRBD as the clustered LVM physical
volume, you would instead use the SAN's LUN. Otherwise, it should give
you everything you need.

For what it's worth, I've got a dozen of these kind of clusters in
production in the US and Canada. Some have been running for quite a
while and without issues. So I am confident in saying that it should be
a good replacement for VCS.

If you do try to implement this, and if you run into any trouble, I (and
I am sure others) will be happy to help. If you can get onto IRC, many
of us can be found on freenode.net in the #linux-cluster channel.



On 08/27/2012 12:14 PM, joshi dhaval wrote:
> Thanks, I think by reading this i will be able to clear my concepts for
> requirement  ..
> my goal is to replace VCS with redhat cluster, we have several servers
> running with Oracle, sybase, UDB  and some of the application resources
> .. ..
> first to start with i am planning to configure 2 node cluster with
> shared SAN storage and test failover for mount points ....  below
> document looks to me something related to redhat virtual machines ..
> will i able to acheive what i want by reading this Document ( though
> what i understood is i will able to clear my concepts ).
> --- On *Mon, 8/27/12, Digimer /<lists at alteeve.ca>/* wrote:
>     From: Digimer <lists at alteeve.ca>
>     Subject: Re: [Linux-cluster] RHCS evaluation
>     To: "linux clustering" <linux-cluster at redhat.com>
>     Cc: "joshi dhaval" <d_joshi84 at yahoo.com>
>     Date: Monday, August 27, 2012, 9:31 PM
>     On 08/27/2012 11:47 AM, joshi dhaval wrote:
>     > Hello Experts,
>     >
>     > i am doing evaluation for redhat cluster in our environment, i am
>     > struggling with Installation of packages on RHEL 5.6, Can anyone
>     suggest
>     > me what packages are required for RHEL 5.6 and any good document about
>     > cluster to start with ?
>     >
>     > i am bit confuse with fencing,, is that fencing is mandatory in redhat
>     > cluster ?
>     >
>     > Is this cluster is as reliable as VCS and any i/o or other comparison
>     > matrix available to check the product performance ?
>     >
>     > Regards, Dha
>     Welcome,
>       First up, please upgrade to RHEL 6.3 if you can. It's much more up to
>     date and has a longer life going forward.
>       Yes, fencing is critical. Without it, you cluster will hang (by
>     design) the first time a node fails.
>       It's very stable, I've been running many RHCS clusters in production
>     for three years now.
>       It's hard to make recommendations beyond this without knowing what
>     your goal is. I've got a tutorial on RHEL 6 for Virtual Machines
>     clusters that might help. There is a "concepts" section at the beginning
>     that talks generally about the various parts in the cluster that might
>     be particularly useful.
>     https://alteeve.com/w/2-Node_Red_Hat_KVM_Cluster_Tutorial
>     hth,
>     digimer
>     -- 
>     Digimer
>     Papers and Projects: https://alteeve.ca

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