1. EMTTS UAT Day1 & Day2 Powered by:

2. Topics CoversTopics Remaining Comparison Network Infrastructure Separate EP Hosting Fault Tolerance

3. We were given the task to isolate EP website from pakpost intranet. EP website will be hosted separately from EMTTS application. Data from EMTTS will be replicated on separate EP database.Benefits: In worst scenario if EMTTS Primary and DR sites goes down, user still be able to get track of his article. Pakistan POST web existence/availability will be ensure 99.86% Up time of 99.86% 24/7 availability Backup plan

4. To Facilitate smooth data communications across the network, three fault tolerance schemes are designed

5. Normal Network Flow

6. 12 Local server is down PR Site is down Fault Tolerance Scenarios 3 PR & DR Site is down

7. Local Server is down Scenario 1 Local Server is down

8. Primary Site is down Scenario 2 Primary Site is down

9. Primary and Disaster Recovery Sites are both down Scenario 3

10. DR Site PR DR Comparison SRS Service Resource Maintenance Service Self-Status Check Service Heartbeat Service Redirection Service

11. DR site is the mirror of the PR site database. Database mirroring or real time replication is done by platform provided by Microsoft.

12. Primary ServerDisaster Recovery Server  CPU:- Intel Xeon E3- 1240 V2 @ 3.40 GHz  Ivy Bridge 22nm Technology  RAM:- 32 GB Dual- Channel DDR3@ 665GHz  Storage:- 1 TB SATA SCSI Disk Device (SATA)  225 GB Intel SSDSC2CT24 SCSI Disk Device (SSD)  CPU:- Intel Xeon E3- 1240 V2 @ 3.40 GHz  Ivy Bridge 22nm Technology  RAM:- 32 GB Dual- Channel DDR3@ 665GHz  Storage:- 500 GB SATA SCSI Disk Device (SATA)  225 GB Intel SSDSC2CT24 SCSI Disk Device (SSD)

14. SRS Smart Router service (SRS) is a middle ware that checks statuses of primary and Data Recovery site.. Middle Ware It is centered as a communication medium between sites and the end users. Installation SRS is installed on commercially available ISP which guarantees up time of 99.86% backup plan 24/7 availability. Smart Router Service

15. statuses Checks all resources of primary and DR site and log the statuses easy to move /transfer servers Its easy to move /transfer servers as and when required. ZERO downtime Can also be used to deploy new releases/ enhancements with ZERO downtime for users Notifies Notifies the concerned authorities in case of any issue redirect traffic If Primary server goes down, redirect traffic to DR site independent Allow us to make the application IP and location independent 77 66 55 3 3 2 2 1 1 static IP To ensure security and future needs, static IP will be assigned to each location 88

16. Resource Maintenance Service Self-Status Check Service Heartbeat Service Redirection Service

17. This service will be continuously monitoring the status of the IIS and Database of the PR and DR Site.

19. Sr No.Description 1SRS requests status of IIS at Primary Site 2As IIS is up, a positive response is generated. 3SRS updates the status of IIS in database log. 4SRS requests status of database at Primary Site. 5As database is up, a positive response is generated. 6SRS updates the status of primary site in database. 7SRS requests status of IIS at DR Site 8As IIS is up, a positive response is generated. 9SRS updates the status of IIS in database log. 10SRS requests status of database at DR Site. 11As database is up, a positive response is generated. 12SRS updates the status of primary site in database. DIAGRAM DESCRIPTION

20. This service will run on the PR and DR Site and will requesting their current status from SRS Service.

22. Sr No.Description 1Primary Site generates status inquiry request. 2SRS checks the database status of Primary Site. 3As Primary site is up, a positive response is generated. 4 SRS informs the PR agent about the current status i.e. the site is up. 5DR site sends status inquiry request to SRS. 6 SRS requests database for current status information of DR site. 7As DR is up, a positive response is generated. 8SRS informs the DR agent about the current status. DIAGRAM DESCRIPTION

23. It enable local sites to check status of Primary and DR Site, so that it redirect user accordingly.

24. 1 2 Live user Local User access Scenarios

26. DIAGRAM DESCRIPTION Sr. NoDescription 1Local user requests PR/DR site. 2 The request is analyzed (whether the user is allowed to connect to PR/DR site). 3As local user is not allowed to access, User access is denied. 4Response (Access denied) is generated back to user. 5User Requests Local site. 6Request is analyzed. 7As local user is allowed to connect to local site. 8Positive response (ok) is generated to user.

28. DIAGRAM DESCRIPTION Sr. NoDescription 1Live user requests local site. 2 The request is analyzed (whether the user is allowed to connect to the site). 3As local user is not allowed to access, User access is denied. 4Response (Access denied) is generated back to user. 5User Requests PR/DR site. 6Request is analyzed. 7As local user is allowed to connect to PR/DR site. 8Positive response (ok) is generated to user.

30. DIAGRAM DESCRIPTION Sr. NoDescription 1Local site 1 requests SRS to know status of DR site. 2SRS checks its database log 3As local user is not allowed to access, User access is denied. 4Response (Access denied) is generated back to user. 5User Requests PR/DR site. 6Request is analyzed. 7As local user is allowed to connect to PR/DR site. 8Positive response (ok) is generated to user.

31. This service will redirect the user requests as per availability of the PR or DR site.

32. Redirection Service Whenever dakkhana.com.pk is browsed, redirection service takes the updated database information from SRS and redirects the request accordingly. There are three possible functional states of SRS  Normal Flow  Local Server is down  When Primary site is down  When PR and DR site are both down

33. Normal Network Flow

34. Local Server is down Scenario 1 Local Server is down

35. Primary Site is down Scenario 2 Primary Site is down

36. Primary and Disaster Recovery Sites are both down Scenario 3

37. Thank you