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RE: [Linux-cluster] Severe problems with 64-bit RHCS on RHEL5.1



Oh my dear Alex,

It really goes that way! - I just can't believe - you are one hell of a genious.

I havn't had a clue about it could be something this simple. It really works. I feel stupid.

So, I was really driving grazy with this cluster ver 5 yesterday, but now it seems that both of my problems are solved:

1. unable to bring just one node up in 2-node cluster - hanging in fencing / fence failed

Reason: cman was told (by RH) to be started before qdisk and this is wrong way.
Qdisk have to be started first in this situation, so fence_tool is not wondering why cluster is not quorate ;)

2. restart of cluster daemons not succesfull

Reason: You have to wait "token timeout" before starting again ;)

Great.

Thanks for all you. RH support has been thinking these problems 3 weeks now without success.

-hjp


-----Original Message-----
From: linux-cluster-bounces redhat com on behalf of Alex Kompel
Sent: Fri 4/18/2008 4:10
To: linux clustering
Subject: Re: [Linux-cluster] Severe problems with 64-bit RHCS on RHEL5.1
 
2008/4/17 Harri Päiväniemi <harri paivaniemi tietoenator com>:
>
> The 2nd problem that still exists is:
>
> When node a and b are running and everything is ok. I stop node b's
> cluster daemons. when I start node b again, this situation stays
> forever:
>
> ----------------
> node a - clustat
> Member Status: Quorate
>
>  Member Name                        ID   Status
>  ------ ----                        ---- ------
>  areenasql1                            1 Online, Local, rgmanager
>  areenasql2                            2 Offline
>  /dev/sda                              0 Online, Quorum Disk
>
>  Service Name         Owner (Last)                   State
>  ------- ----         ----- ------                   -----
>  service:areena       areenasql1                     started
>
> -------------------
>
> node b - clustat
>
> Member Status: Quorate
>
>  Member Name                        ID   Status
>  ------ ----                        ---- ------
>  areenasql1                            1 Online, rgmanager
>  areenasql2                            2 Online, Local, rgmanager
>  /dev/sda                              0 Offline, Quorum Disk
>
>  Service Name         Owner (Last)                   State
>  ------- ----         ----- ------                   -----
>  service:areena       areenasql1                     started
>
>
> So node b's quorum disk is offline, log says it's registred ok and
> heuristic is UP... node a sees node b as offline. If I reboot node b, it
> works ok and joins ok...

Now that you have mentioned it - I remember stumbling upon the similar
problem. It happens if you restart the cluster services before the
cluster realizes the node is dead. I guess it is a bug since the node
is in some sort of limbo state at that moment reporting itsefl being
part of the cluster while the cluster does not recognize it as a
member. If you wait 70 seconds ( cluster.conf: <totem token="70000"/>
) before starting the cluster services then it will come up fine. The
reboot works for you because it take longer than 70 sec (correct me if
I am wrong). So try stopping node b cluster services, wait 70 secs and
then start them back up.

-Alex

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