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Re: [Cluster-Devel] Submitting two new resource plugins to the project



El lun, 08-06-2009 a las 16:58 +0200, Rafael Micó Miranda escribió:
> Hi,
> 
> I have developed a couple of resources for Linux-Cluster (CMAN
> +rgmanager) which try to fix some needs I see in Linux-Cluster when
> compared with other cluster solution (concretely, Linux-HA a.k.a.
> Heartbeat). I am a Linux-HA user and I think this two functionalities
> could be useful in Linux-Cluster. 
> 
> I would like to give them (both resources) to the community to make them
> be into the project, and maybe after testing/quality testing or so be
> included into the RedHat Enterprise Linux packages of Linux-Cluster, so
> RedHat will give support for them and include them into the
> system-config-cluster tool to have a GUI that can configure this
> resources and handle their information.
> 
> I'll give you some details of both resources:
> 
> 1.- ping-group: tries to bring to Linux-Cluster the Ping Group
> functionality of Linux-HA.
> 
> For those who don't know Ping Group, the idea is the following: its a
> NODE functionality (not a service or a resource) that checks IP
> communications with a list of given client nodes. When failed, Ping
> Group will move all services running in the affected node to other nodes
> that have proved that keep their communications right, so the service is
> provided to the clients even if there is a network problem that affects
> only a node of your cluster but the cluster itself wont realize about
> it.
> 
> I have developed ping-group as a resource to be used into a service of
> your cluster, so in the resource arguments you can specify a list of
> clients that service should take note on. There is one thing that could
> be improved: ping-group will mark the service as failed even if the
> other nodes of the cluster would fail too due to lack of communications
> with the clients (for example, all clients are powered off). In this
> situation the service will go on migrating from one node to another
> according to your service failover policy and finally the service will
> be stopped. Maybe some ideas could be useful to improve this behaviour.
> 
> 
> 2.- lvm-cluster: tries to bring to Linux-Cluster an exclusive shared
> storage option, using features of LVM2. I got accustomed to this kind of
> volumes when working with Linux-Ha + EVMS solution (using Cluster
> Segment Manager plug-in).
> 
> When defining a new LVM2 volume four your cluster, you can set it as
> cluster-disabled (the volume will behave as a local volume even if it is
> on shared storage) or as cluster-enabled (the LVM volume can be
> activated on many different cluster nodes at the same time).
> 
> Of course, if the filesystem placed into the LVM volume is not a
> clustered filesystem (GFS2) a cluster-enabled volume allows a bad
> administrator mount a no-clustered filesystem (EXT3) in more than one
> node of the cluster which may produce filesystem corruption. This is
> because the LVM "open flag" of the filesystem is not propagated through
> all the members of the cluster, so there is no knowledge of the state of
> the filesystem and this situations can happen.
> 
> This can be fixed with some of the options of LVM, specifically the
> "enable exclusively flag". This flag, when used over a cluster-enabled
> volume, will allow the VolumeGroup to be imported by all the nodes of
> the cluster but the LogicalVolumes into the VolumeGroup can only be
> activated by a single node. So, only one node of your cluster will have
> the LogicalVolume device (for example /dev/VolGrp01/LogVol01) and the
> problem explained above cannot happen. This is not about propagating the
> "open flag" through the nodes, this is about making the LogicalVolume be
> in only one node.
> 
> I have developed lvm-cluster as a resource to be used into a service of
> your cluster. In the arguments you an specify the name of the
> VolumeGroup and the LogicalVolume to handle.
> 
> 
> 
> So, I would like to receive the instructions to submit this two
> resources to the project to improve them, test them and find any bugs
> that could still be in the code. I have made some testing but of course
> they need much more to allow them be put into the main project.
> 
> Sincerely yours,

I received not even a simple reply, no one will help me?

Thanks in advance,

-- 
Rafael Micó Miranda


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