[CentOS] DRBD,GFS2 and GNBD without all clustered cman stuff

Raffaele Camarda raffaele.camarda at gmail.com
Wed Apr 14 17:55:15 UTC 2010


Thanks Juergen for your response. I did not post till now because i've been
fighting with all cluster stuff ! :D

I mean GFS2. DRBD, mysql and heartbeat work fine in an active/passive
configuration.

What really does not fit to my needs is the cluster stuff which i have to
use only to be able to mount the GFS2 FS.

I really do not get why i cannot be left free to choose my configuration. So
to mount a GFS2 FS i had to install the cluster groups, ok i did surrended
to this.

Now when i switch from one to another mysql server it doesn't start the
service because of fencing! Ok i do not need fencing, but ok, i tought
because it needs it i will set up a xen fence, no i can't beacause the dom0
have to be cluster members and i do not need aand want cluster stuff for
dom0...

So i'm escalating problems because i cannot mount a GFS2 FS without all the
cluster stuff. I will need to modifice sbin and to write script by myself to
use fence_ack_manual, ok it is not suggested but i'm assuming the risk for
that.

So if someone have been able to set up a GFS2 mount without Cluster stuff
(cman) i will be happy to listen to!

For now i can tell great DRBD and GFS2: two great peace of software.

Cheers
Raffaele

2010/3/29 Juergen Gotteswinter <jg at internetx.de>

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
> >
> >
> >
> >
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > http://lists.centos.org/mailman/listinfo/centos
>
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