1. Client / Server Correlation Values
Anthony Berglas

2. Customer Requirement
Need to be able to include client context in server logs
E.g. Which storage device is being processed?
Need to be able to store server context in client logs
So can ask server administrator “What went wrong with request s739c983nf?”
Good logging is essential for security and usability

3. Proposed Solution
Add Client Correlation as a simple string in request header
Add Server Correlation as a simple string in response header
Server should log Client Correlation value
Server should be able to identify log record using Server Correlation value

4. Example Request
<RequestMessage> <RequestHeader> <ProtocolVersion> … <ProtocolVersion> <BatchCount type="Integer" value="1"/> <ClientCorrelation type=“TextString” value=“sid=s348sa3d”/> </RequestHeader> …

5. Example Response <ResponseMessage> <ResponseHeader>
<ProtocolVersion> … </ProtocolVersion>
<TimeStamp type="DateTime"
value=" T08:14:42+00:00"/>
<BatchCount type="Integer" value="1"/>
<ServerCorrelation type=“TextString”
value=“s34:d8a8g7fd900a9d”/>
</ResponseHeader> …

6. Conclusion Very simple additions
Enhance logging and analysis capabilities
Important information for forensic analysis
Very helpful information for diagnosing issues