clustering is SO AWESOME

[Madison Kelly]

Jamon Camisso wrote:
> Madison Kelly wrote:
>> The last couple of weeks I've been messing around with clustering here 
>> at the office. I've been banging my head against the wall trying to 
>> get it working (busted CentOS RPMs aside...).
>>
>> Anyway, I've got it working now and oh wow! When it works, it is a 
>> thing of beauty. If I had portable enough hardware I would love to 
>> give a talk on it.
>>
>> For example;
>>
>> I've got a simple 2-node cluster running LVM on DRBD. This acts as a 
>> base for a set of Xen VMs. I use on-board IPMI as my fence devices and 
>> CentOS/Red Hat Cluster suite for the magic.
>>
>> I've been testing failure and recovery. Just now I decided to bite the 
>> bullet and kill both nodes (simulated power event). This was were 
>> things kept falling apart for me up until now. This time though, with 
>> the bugs squashed, it recovered fine.
> 
> Question, are you using a cluster filesystem on top of your volumes? I'm 
> trying to decide between ocfs2 and gfs2 for a san backend shared between 
> 4 machines. Any suggestions?
> 
> Jamon

For my 2-node, I run cluster-aware LVM on top of DRBD. I've been meaning 
to play with OCFS2 and GFS, but haven't yet. Currently I am working on a 
home-brew iSCSI/SAN box though, so I may have an opinion in the 
relatively near future.

Madi
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