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

[SUVANKAR MOITRA]

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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