SQL PATCH IN CLUSTER ENVIRONMENT

Dear All,
One of my client is having SAP ECC6.0 , SQL 2005 , windows 2003 64 bit.
They are having SQL 2005 version 9.00.1399 and according to SAP it is no more supported so they want to upgrade it to 9.00.4035.
In DEV and QAS (non cluster environment) they are already having 9.00.4035 .
- Can you guys please guide me about how to apply SQL patch in Cluster environment.
- Shall I apply patch 9.00.4035 directly from 9.00.1399
- Any recommendations before and after applying patched
Kindly guide.
Regards,
Rmoihnitii

Hello my friend
Unfortunately this is not a zero down time solution since Database Services and Analysis Services checkboxes will not be available while patching SP3:
1. Launch SP3 package on the active node;
2. Select authentication mode for the instance you are going to update;
3. Enter credentials of the login you want to run service pack on behalf of;
4. Click all the way next to start installing;
Then you need to update the inactive node it is necessary to execute all the steps except steps 2 and 3. There can be some problems with updating database service in the cluster. Restart of each node of the cluster and restart of the cluster service usually resolves all the problems. After restart try to update database service one more time.
Regards,
Effan

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