CentOS - Mar 2010 - DRBD,GFS2 and GNBD without all clustered cman stuff

Hi all,

Where i want to arrive:

1) having two storage server replicating partition with DRBD
2) exporting via GNBD from the primary server the drbd with GFS2
3) inporting the GNBD on some nodes and mount it with GFS2

Assuming no logical error are done in the last points logic this is the
situation:

Server 1: LogVol09, DRDB configured as /dev/drbd0 replicated to Server 2.
DRBD seems to work perfect as cat /proc/drbd
Server 2: LogVol09, Secondary for /dev/drbd, cat /proc/drbd is ok

What i thought to do was to export via GNBD the /dev/drbd0 to import it on a
couple of nodes. Using GFS2 as FS for concurrent usage.

I got to format the GFS2 FS on the Server 1 drbd0 device. But was unable to
mount it because gfs_controld wasn't accepting connections, i discovered
that cman manage gfs_controld. In any case i started it manually and
discover that it try to use ccsd daemon which i have not installed.

Ok, i do not need to mount it locally so i started configuring GNBD, started
manualli the server end stated the export command...again the cman/ccsd
problem:

gnbd_clusterd: ERROR cannot join cman

Now, what i'm asking: am i forced to use all the cluster stuff cman,
ccsd...fence...with this configuration? I would like only to use the tools i
need: DRDB, GNBD and GFS2 without cluster facilities.

Thanks
Raffaele
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Hi,

yes, you need to go with the Cluster Stuff...

Regarding your Setup, i got the best experience with drbd + gfs + iscsi
export. GNBD was not as Stable than i expected. Overall Performance was
even worse, too compared with iSCSI.

Greetings

Juergen

On 03/27/2010 05:39 PM, Raffaele Camarda wrote:
> Hi all,
> 
> Where i want to arrive:
> 
> 1) having two storage server replicating partition with DRBD
> 2) exporting via GNBD from the primary server the drbd with GFS2
> 3) inporting the GNBD on some nodes and mount it with GFS2
> 
> Assuming no logical error are done in the last points logic this is the
> situation:
> 
> Server 1: LogVol09, DRDB configured as /dev/drbd0 replicated to Server 2.
> DRBD seems to work perfect as cat /proc/drbd
> Server 2: LogVol09, Secondary for /dev/drbd, cat /proc/drbd is ok
> 
> What i thought to do was to export via GNBD the /dev/drbd0 to import it on
a
> couple of nodes. Using GFS2 as FS for concurrent usage.
> 
> I got to format the GFS2 FS on the Server 1 drbd0 device. But was unable to
> mount it because gfs_controld wasn't accepting connections, i
discovered
> that cman manage gfs_controld. In any case i started it manually and
> discover that it try to use ccsd daemon which i have not installed.
> 
> Ok, i do not need to mount it locally so i started configuring GNBD,
started
> manualli the server end stated the export command...again the cman/ccsd
> problem:
> 
> gnbd_clusterd: ERROR cannot join cman
> 
> Now, what i'm asking: am i forced to use all the cluster stuff cman,
> ccsd...fence...with this configuration? I would like only to use the tools
i
> need: DRDB, GNBD and GFS2 without cluster facilities.
> 
> Thanks
> Raffaele
> 
> 
> 
> 
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