Hi Friends,
From past two weeks we are facing one strange issue, users are complaining about system performance very slow, when we checked in the system if user is excuting any transaction first time system is taking very very long time and second time its coming faster , we understand that SAP say ignore first run, but this is happening daily in between some hours for example today i run one t code first time its very slow and second run is fine but after some time may be after 6 hour or next day again if i run the t code it will be slow and next time it will come fast.
this isssue was started with few users and spreading and suddenly all the work process came in running stage and user cannot log in to the system, hence we tried to restar the system and we notice that our micro soft cluster is having issue resoucres where not moving to Node2.
Hour network and windows admin find out that there is issue with virtual network between both the nodes please seee there comments
it was found that both your servers where trying to mount the cluster disks to themselves creating a grid lock.
In such an event both nodes assume that their partner nodes are down and the primary node always locks the cluster resources and never allows second node to take the ownership of the resources.
This grid lock occurs when there is an issue with RPC services are not able to synch with net bios services or tcp/ip services or when you have tcp ip errors.
So I had to shut down both the servers un present and present he storage LUNs from both the hosts allowing a re mapping of resources to the nodes.
After doing the above activities the node 2 was brought up with all your cluster resources with Oracle and sap services coming up
Kindly help us to fix this issue and let me know you need any logs
Thanks
Basis