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Re: [Linux-cluster] Create Cluster using existing LVM on shared storage



Thanks again. I think I have everything I need now.

Ron Cronenwett


On Thu, Jun 12, 2008 at 12:20 PM, Jonathan Brassow <jbrassow redhat com> wrote:
> Snapshot volumes are the only thing that would not work (because there is no
> cluster-aware snapshot implementation yet).
>
> Other than that, all your volumes will convert just fine without having to
> recreate, etc.
>
> Once you've got the cluster infrastructure setup, all you need to do is:
> *> setup cluster infrastructure
> *> install lvm2-cluster
> 1> vgchange -an <volume group> # deactivate volumes
> 2> vgchange -cy <volume group>  # set cluster attribute
> 3> vgchange -ay <volume group> # re-activate the volumes
>
>  brassow
>
> On Jun 11, 2008, at 8:23 AM, Ron Cronenwett wrote:
>
>> Excellent, this answers most of what I was looking for.
>> Just one question, if I were to install CLVM, can the existing volume
>> group and logical volume be converted or would I need to recreate
>> everything and restore the data from a back up copy?
>>
>> Thanks
>>
>> Ron Cronenwett
>>
>>
>> On Wed, Jun 11, 2008 at 8:16 AM, Jonathan Brassow <jbrassow redhat com>
>> wrote:
>>>
>>> Here is a good source of information for those questions:
>>> http://sources.redhat.com/cluster/wiki/LVMFailover
>>>
>>> brassow
>>>
>>> On Jun 10, 2008, at 7:12 PM, Ron Cronenwett wrote:
>>>
>>>> Hi all,
>>>>
>>>> I have been presented a pair of servers (RHEL 5.2) connected to a dual
>>>> port scsi array. The storage has been configured as one large disk
>>>> partitioned into /dev/sdb1 /dev/sdb2,and /dev/sdb3 with dev/sdb3 the
>>>> sole device in a physical volume. Several logical volumes have been
>>>> created on the physical volume. Currently the logical volumes are
>>>> mounted on server A. Server B was added to the mix as a new server.
>>>> Server B sees the external storage with fdisk -l and the volumes with
>>>> pvdisplay.
>>>>
>>>> My questions are, can an existing logical volume be used as a cluster
>>>> resource that is mounted on one node or the other (but not both)?
>>>> Would this work with just the existing LVM or would CLVM be needed? If
>>>> I need CLVM, can the existing logical volumes be used without
>>>> destroying the existing data?  In either case, would all the logical
>>>> volumes need to be mounted on the same server or can just one logical
>>>> volume be mounted on one server while the remaining logical volumes
>>>> are mounted on the other?
>>>>
>>>> The idea is to create an active-passive HA cluster of an existing web
>>>> server.
>>>>
>>>> Any thoughts, ideas, comments, questions would be appreciated.
>>>>
>>>> Thanks
>>>>
>>>> Ron Cronenwett
>>>>
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>>>
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