Hi, thanks for your answer.
On 20 July 2011 09:06, <[email protected]> wrote: > Hi Marc, > > > though Digimer's RHCS tutorial is an excellent introducion to the > RHCS cluster with a thourough step by step reference to setting > up a Xen cluster, and I'd highly recommend you read it, you > probably also would like to have look at these articles in the > cluster wiki which focus a little more condensed on your > questions. > > Here is described how to set up so called HA-LVM which avoids the > clmvd overhead and is for settings like yours where you only > require active/passive VG activation (i.e. a shared storage VG is > only activated on a single cluster node at any time). > This is achieved by tagging of the affected VGs/LVs. > > https://fedorahosted.org/cluster/wiki/LVMFailover > > Unfortunately, this article lacks mentioning of the required > locking_type setting in lvm.conf. > > But if you have access to RHN this article on HA-LVM does, and it > also outlines both methods, i.e. the so called "preferred clvmd" > method and the so called "original" (or what I'd call "tagging") > method which doesn't require clvmd: > > https://access.redhat.com/kb/docs/DOC-3068 > > > Should you on the other hand require active/active VGs (i.e. > simultaneous activation of the same shared VG on more than one > cluster node), which I consider not a requirement for a KVM > cluster (but I lack any experience in this field) the recommended > procedure is described here: > > https://access.redhat.com/kb/docs/DOC-17651 > Great links, this is what we were looking for. We'll try this before testing GFS2 because we are preferably want to work directly over Logical Volumes. Thanks a lot for your reply, Marc > > > Important aside, after you've edited the lvm.conf you are > required to make a new initial ramdisk (or at least touch the > mtime of the current initrd) or cluster services won't start on > that node (watch entries in messages or whereever syslogd logs > clulog stuff to). > > > > In this article you may find something treating KVM VMs' > migration. > > https://fedorahosted.org/cluster/wiki/KvmMigration > > > Regards > Ralph > (an RHCS newbie himself) > ________________________________ > > From: [email protected] > [mailto:[email protected]] On Behalf Of Marc > Caubet > Sent: Tuesday, July 19, 2011 4:19 PM > To: [email protected] > Subject: [Linux-cluster] Linux Cluster + KVM + LVM2 > > > Hi, > > we are testing RedHat Cluster to build a KVM > virtualization infrastructure. This is the first time we use the > Linux Cluster so we are a little bit lost. Hope someone can help. > > Actually we have 2 hypervisors connected via Fiber > Channel to a shared storage (both servers see the same 15TB > device /dev/mapper/mpathb). > > Our idea is a shared storage to hold KVM virtual machines > by using LVM2. Both server should be able to run Virtual Machines > from the same storage, but we should be able to migrate or start > virtual machines on the other server node on crash. > > So the plan is: > > - Virtual Machine image = Logical Volume > - CLVM2 cluster: only one server node at the same time > will be able to manage the volume group- > - KVM Virtual Machine High Availability. Machines will > run on one server node. If for some reason the server node > crashes, the second will start / migrate the virtual machine. > > Basically we woul like to know: > > - How can we create a cluster for the LVM2 shared storage > (when we create it, it does not work since both server nodes have > the VG as Active) > - How can we create a cluster service for a virtual > machine (we guess it has to be done 1 by 1) > - Since we have 2 server nodes, how to increase the > number of votes for quorum (qdisk over a heartbeat logical volume > partition?) > > Thanks and best regards, > -- > Marc Caubet Serrabou > PIC (Port d'Informació Científica) > Campus UAB, Edificio D > E-08193 Bellaterra, Barcelona > Tel: +34 93 581 33 22 > Fax: +34 93 581 41 10 > http://www.pic.es > Avis - Aviso - Legal Notice: > http://www.ifae.es/legal.html > > > > -- > Linux-cluster mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/linux-cluster > -- Marc Caubet Serrabou PIC (Port d'Informació Científica) Campus UAB, Edificio D E-08193 Bellaterra, Barcelona Tel: +34 93 581 33 22 Fax: +34 93 581 41 10 http://www.pic.es Avis - Aviso - Legal Notice: http://www.ifae.es/legal.html
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