[Linux-cluster] doubts about using clvm

[carlopmart]

Thanks Erling. But I have last question. I will try to combine two 
disks on GFS clients side. If I understand correct, first i need to 
import gnbd devices on both GFS nodes, right??. And second, I need to 
setup lvm from GFS nodes and start clvm service on both nodes too. 
But, I need to create shared lvm disk on both GFS nodes or only on one 
node???


Erling Nygaard wrote:
> On 1/2/06, carlopmart <carlopmart at gmail.com> wrote:
> 
>>Sorry my poor vocabulary :)
> 
> 
> No problem. Common mistake :-)
> 
>>Erling Nygaard wrote:
>>
>>>Some nitpicking first :-)
>>>There is no such thing as a "GFS server" or "GFS client". The nodes that
>>>are mounting a GFS filesystem are usually called "GFS nodes"
>>>However, there are indeed "GNBD servers" and "GNBD clients that exports
>>>and imports blockdevices.
>>>
>>>So I understand your setup to be one node (the Ubuntu node) is acting as
>>>a GNBD server and exports two disk drives.
>>
>>Correct.
>>
>>
>>>And then there are two nodes (the RHEL4 nodes) that acts as GNBD clients
>>>and imports the two disk drives.
>>
>>Correct.
>>  On these disk drives is the GFS filesystem.
>>
>>No, these are raw partiitons as describres in sources.redhat.com
>>(min-gfs.txt).
> 
> 
> Oh. Well, these are the partitions you intend to make GFS on then :-)
> 
> 
>>>I have not used CLVM with GFS yet, but with the old pool-driver (the
>>>volume manager that was shipped with GFS previously) this setup could be
>>>done in 2 different ways:
>>>1. Combine the two disk drives on the GNBD server and export _one_ volume
>>
>>In this case I need to run clvm on ubuntu server, right??
>>
> 
> Yes. In this case clvm daemon runs on the ubuntu server. There is one
> GNBD server exports the one LVM volume.
> 
> In your setup I think this would be the easier way to do the setup.
> Your two disk drives will be combined on the GNBD server, so there is
> only one volume to be exported by the GNBD server.
> So on the GNBD clients you don't have to worry about having to combine
> two GNBD imports.
> 
> With the second method you would have to run CLVM on both GFND clients
> (GFS nodes) to combine the exported disk drives.
> 
> Other than somewhat simpler setup I don't thin there is any good
> reason for one over the other.
> 
> As I said, I have only done this with pool, not CLVM. Other speak up
> if this for some bizarre reason would not work.
> 
> 
> 
>>>2. Export _two_ volumes from the GNBD server and combine the volumes on
>>>the GNBD client / GFS nodes.
>>>
>>>I would assume both ways would work with CLVM.
>>>
>>>
>>>On 1/2/06, *carlopmart* <carlopmart at gmail.com
>>><mailto:carlopmart at gmail.com>> wrote:
>>>
>>>    Hi all,
>>>
>>>      I am testing Cluster/GFS suite under my vmware lab. I have installed
>>>    two RHEL 4 with CS and GFS support. Another machine acts as a GFS
>>>    server (Ubuntu breezy server that has rhcs/gfs included).
>>>
>>>      Ubuntu server has two phisycal disks exported by gnbd daemon and
>>>    RHEL   import these disks as a GFS clients. But I would like to export
>>>    these disks as a unique disk using LVM. Then, I need to start clvm
>>>    process under Ubuntu server or on RHEL clients??? Is it possible to
>>>    accomplish this?.
>>>
>>>    Thanks.
>>>    --
>>>    CL Martinez
>>>    carlopmart {at} gmail {d0t} com
> 
> 
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-- 
CL Martinez
carlopmart {at} gmail {d0t} com