[Linux-cluster] Network failure results cluster environment unstable & fragile

[Deval kulshrestha]

Dear Suvankar

On my setup, I have to run Mail and Web solution with some additional
stuff(Mysql, Anti virus, Anti spam etc...).
I had never tried oracle on this.

Sorry, 
but do you have robust cluster environment. For me it's still looking very
fragile(in network perspective), if network goes-off, or at peak load when
nodes can not communicate to each other. This makes big chaos.

Regards 
Deval K.



-----Original Message-----
From: SUVANKAR MOITRA [mailto:suvankar_moitra at yahoo.com] 
Sent: Friday, February 24, 2006 10:45 AM
To: Deval kulshrestha; linux clustering
Subject: Re: [Linux-cluster] Network failure results cluster environment
unstable & fragile

dear deval,

I am also using the same thing .Did u install oracle
10g on active/passive cluster.If u then pl send me the
doc bcos i was unable to do the installation of oracle
10g on cluster.

regards

Suvankar Moitra
0-9830152623

--- Deval kulshrestha
<deval.kulshrestha at progression.com> wrote:

> Hi 
> 
> I am struggling to get some help on following
> configuration. This setup is
> intended to put live in a data center for 24 x 7
> x365, any issue that makes
> my environment unstable is very critical here.
> 
>  
> 
>  
> 
> My HA Cluster Setup details
> 
>  
> 
> 1.	HP DL 360 G4p Server                       2nos.
> 2.	HP MSA 500 G2 (SAN)                     1nos.
> 3.	RedHat Enterprise Linux 4 ES  
> 4.	Red Hat Cluster Suite 4
> 
>  
> 
> Server does have a HP SCSI HBA. MSA 500G2 is a scsi
> based SAN. Both of these
> server are connected to SAN using SCSI VHDCI cable.
> I used a network switch
> to establish network connectivity for the server.
> created a disk array of
> three HDD on SAN with two logical volumes than  I
> have installed RHEL 4
> Update 1 on both server(Servers are configured with
> RAID 1) than installed
> all HP drivers and management agents. After server
> configuration and OS
> installation I have installed Red Hat Cluster Suite
> v 4 on both the machine.
> 
>  
> 
> Than I have configured Cluster using Cluster
> Configuration Manager. Added
> member hosts, configured fence device and assigned
> to member host(HP iLO is
> certified as an fence device), Configured Failover
> domain with node
> priority, configured resources such as floating IP
> address, File System,
> Script, than configured service which need to be run
> in HA mode.
> 
>  
> 
> After configuring this I have tested with various
> scenario HA is working
> properly, when ever powered off any machine ,
> services fail over on
> available node. 
> 
>  
> 
> Problem:
> 
>  
> 
> If network goes off on node1, and service which were
> not running on node1
> are started by node1 with shared storage mount
> point, which was already
> running on node 2 but both of these nodes are not
> able to communicate to
> each other, node2 anyway already running the same
> service with shared
> storage mount point. Because of Fencing both of
> these nodes try to kill each
> other. Both of they got hanged up at "Stoping
> Cluster manager Services.".In
> /var/log/messages, it shows fencing s1, fence
> successful. 
> 
> If we disable fencing than 
> 
> If network comes back nodes don't synchronize with
> each other. Shared
> storage mount point is available to both the
> servers. If they try to access
> storage at same storage gives IO errors. Hence this
> entire setup become very
> unstable, fragile.
> 
>  
> 
>  
> 
>  
> 
>  
> 
>  
> 
>  
> 
> With Regard
> 
> Deval
> 
> Progression Infonet Pvt. Ltd. 
> 55, Independent Electronic Modules, 
> Sector - 18, Electronic City, 
> Gurgaon - 122015
> 
> India
> Tel          : - 0124 - 2455070, Ext. 215, Fax:
> 91-124-2398647
> Mobile   : - 98186 -82509 
> URL        : - www.progression.com 
> 
>  
> 
>
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===========================================================
Privileged or confidential information may be contained
in this message. If you are not the addressee indicated
in this message (or responsible for delivery of the 
message to such person), please delete this message and
kindly notify the sender by an emailed reply. Opinions,
conclusions and other information in this message that
do not relate to the official business of Progression
and its associate entities shall be understood as neither
given nor endorsed by them.
  

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