[ClusterLabs] Antw: Re: principal questions to a two-node cluster

Michael Schwartzkopff ms at sys4.de
Thu Apr 23 04:54:22 EDT 2015

Am Mittwoch, 22. April 2015, 16:17:57 schrieb Lentes, Bernd:
> Hi,
> ok. I've been asked for more precise information. Here they are:
> I'd like to create a two-node cluster with a SAN. I have two nodes (HP
> ProLiant with SLES 11 SP3 64bit) and a HP FC SAN. My ressources are some
> vm's. Also some databases and web applications. Maybe I will install the
> databases and applications also into vm's, I don't know currently exactly.
> I'd like to have availability, no active/active or master/slave.
> Active/passive should be sufficient 
> What I'd like to know:
> - If I will use logical volumes, do I need cLVM ? Or is "normal" LVM
> sufficient ?

If you want your LVMs either on the left or the right node, plain LVM is 
sufficient. If you want part or your LVMs to run on the left node while the 
other parts runs on the right node, you need cLVM. And DLM.

 - snapshots with cLVM now seems to work:
> https://www.suse.com/releasenotes/x86_64/SLE-HA/11-SP3/#id303161 (I will
> use SLES 11 SP3) - I'd like to have snapshots. Freezing systems before
> applying software or changing configuration is fine. How can I achieve it ?

What do you mean with freezing?

> I don't like to use btrfs on production systems. Ext4 snapshots are
> experimental. OCFS2 has file snapshots. But most of you propose not use
> OCFS2. cLVM offers snapshots. Any other idea ? - How is the setup with cLVM
> ? This is my idea:  SAN offers one or more volumes to the nodes ==> disks
> which appears in the nodes from the SAN are used as physical volumes ==>
> physical volume/s are combined to a volume group ==> logical volumes are
> created on top of this vg, one lv for every virtual machine ==> formatted
> with a file system like ext3 (because each virtual machine does not run
> concurrently on both nodes this should work) ==> each virtual machine in a
> raw file, one vm for each lv . Does that work ? Possible to run different
> virtual machines on different nodes concurrently (as a poor load balancing)
> ? 
> Thanks for every hint.
> Bernd
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Mit freundlichen Grüßen,

Michael Schwartzkopff

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