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



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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