For SAP; What is the "job description" for the back-up blade?

Dear all,
We have several cases that the back-up blade didn't pick up the workload from the failed/hang blades ( we are using the Ver 49), and I would like to know why. What are the cases that are not applicable to back up blade? Even if I think that the back-up blade picked up the load, I am not 100% sure if that is the case, is there any log that I can see that the queries were switched to the back up blade, how can I confirm this?
The reason I am asking this is, if I have say indexes for the cube ABC in blade 1 and if it's hang/down, how can the back up blade pick up that data and serve to the customer? At the end, if it's not working properly, I can use it as a normal productive blade
Cheers
Tansu
Edited by: tansuaksu on May 6, 2009 6:02 AM

Hi Tansu
BWA is a so-called distributed TREX system. You can read more here:
http://help.sap.com/saphelp_nw70/helpdata/EN/21/2183402d9ed062e10000000a155106/frameset.htm
A backup blade (host) takes over in case of a failure of the master blade. The cases are described here:
http://help.sap.com/saphelp_nw70/helpdata/EN/a2/818440cbcccf62e10000000a155106/frameset.htm
The actual switch is pretty fast and usually takes less than a minute (first BWA query needs to load the data into memory of course which add some seconds to the first query execution).
Important: An overloaded blade is NOT down. It's up and running and processing queries (clearly indicated by high CPU load)! Therefore TREX is not switching to the backup blade.
Regards,
Marc
SAP NetWeaver RIG
Note: The same can happen in a database where complex SQL statements lead to 100% CPU load. Here as well you have to manually intervene and terminate the query.

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