If it's not practical, am I left with building a new cluster from scratch? On Sun, Jan 8, 2012 at 8:38 PM, Digimer <li...@alteeve.com> wrote:
> On 01/08/2012 06:39 PM, Terry wrote: > > Hello, > > > > I am trying to gently migrate a 3-node cluster from centos5 to RHEL6. I > > have already taken one of the three nodes out and rebuilt it. My > > thinking is to build a new cluster from the RHEL node but want to run it > > by everyone here first. The cluster consists of a handful of NFS volumes > > and a PostgreSQL database. I am not concerned about the database. I am > > moving to a new version and will simply migrate that. I am more > > concerned about all of the ext4 clustered LVM volumes. In this process, > > if I shut down the old cluster, what's the process to force the new node > > to read those volumes in to the new single-node cluster? A pvscan on > > the new server shows all of the volumes fine. I am concerned there's > > something else I'll have to do here to begin mounting these volumes in > > the new cluster. > > [root@server ~]# pvdisplay > > Skipping clustered volume group vg_data01b > > > > Thanks! > > Technically yes, practically no. Or rather, not without a lot of > testing first. > > I've never done this, but here are some pointers; > > <cman upgrading="yes" disallowed="1" ...> > > upgrading > Set this if you are performing a rolling upgrade of the cluster > between major releases. > > disallowed > Set this to 1 enable cman's Disallowed mode. This is usually > only needed for backwards compatibility. > > <group groupd_compat="1" /> > > Enable compatibility with cluster2 nodes. groupd(8) > > There may be some other things you need to do as well. Please be sure > to do proper testing and, if you have the budget, hire Red Hat to advise > on this process. Also, please report back your results. It would help me > help others in the same boat later. :) > > -- > Digimer > E-Mail: digi...@alteeve.com > Freenode handle: digimer > Papers and Projects: http://alteeve.com > Node Assassin: http://nodeassassin.org > "omg my singularity battery is dead again. > stupid hawking radiation." - epitron >
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