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B9: Success with OpenEdge® Replication David Eddy Senior Solution Consultant What you dont know can hurt you.

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Presentation on theme: "B9: Success with OpenEdge® Replication David Eddy Senior Solution Consultant What you dont know can hurt you."— Presentation transcript:

1 B9: Success with OpenEdge® Replication David Eddy Senior Solution Consultant What you dont know can hurt you

2 © 2008 Progress Software Corporation 2 Obligatory (gratuitious) Quotation An ounce of prevention is worth a pound of cure grams of prevention is worth.45 kilograms of cure

3 © 2008 Progress Software Corporation 3 Success With Replication Understand the architecture Know your requirements Analyze your system Plan, configure, deploy,monitor Succeed

4 © 2008 Progress Software Corporation 4 Agenda Terminology and architecture – Visual Replication performance hotspots Replication availability hotspots Source and target management

5 © 2008 Progress Software Corporation 5 Replication Terminology Primary – original production machine Secondary – original recovery machine Source – production database Target – recovery database Replication server – rpserver (source) Replication agent – rpagent (target) DBService queue – stores IPC messages Network pipe – TCP/IP rpserver -> rpagent

6 © 2008 Progress Software Corporation 6 ! Architecture of Replication – Primary/Source Primary Machine R/Write Clients AI Extents DB Service Q Repl Server AI Extents Source Database Database Brk/Server Processes

7 © 2008 Progress Software Corporation 7 Architecture of Replication – Secondary/Target Secondary Machine Repl Agent Database Brk/Server Processes Target Database R/O Clients

8 © 2008 Progress Software Corporation 8 Architecture of Replication Primary Machine Secondary Machine Repl Agent Database Brk/Server Processes Target Database R/O Clients R/Write Clients AI Extents DB Service Q Repl Server AI Extents Source Database Database Brk/Server Processes

9 © 2008 Progress Software Corporation 9 Agenda Terminology and architecture - Visual Replication performance hotspots Replication availability hotspots Source and target management

10 © 2008 Progress Software Corporation 10 Performance Hotspots Primary Machine Secondary Machine Repl Agent Database Brk/Server Processes Target Database R/O Clients R/Write Clients AI Extents DB Service Q Repl Server AI Extents Source Database Database Brk/Server Processes

11 © 2008 Progress Software Corporation 11 Source DB Performance Considerations Speed/power of machine Replication Plus – offload read only clients to target database AI files – fixed extents AI/BI blocksizes should be the same 16 K is the most efficient Need to truncate ai and bi

12 © 2008 Progress Software Corporation 12 Target DB Performance Considerations System should not be underpowered by comparison to the source system No need for after-imaging Read only clients

13 © 2008 Progress Software Corporation 13 Network Performance WAN vs. LAN The bigger the pipe the better Determine size of pipe Whitepaper available on PDSN

14 © 2008 Progress Software Corporation 14 Sample Network Bandwidth Calculation Hourly After Image Blocks from 5 production databases = 713mb By calculation: Replication size = 1.5 * AI size –713mb*1.5 = mb Add replication overhead (1.1) –1069.5mb*1.1 = mb Throughput per second: mb/3600=.32679mb/b Change to kilobytes /s:.32679mb/s * 1000 = kb/b needed to sustain transfer

15 © 2008 Progress Software Corporation 15 Replication Performance – DBService Buffer DBService Buffer Queue must be sized appropriately – Solution P Failure to do so may result in source slowdown and target falling behind Analyze AI activity prior to implementing Use PROMON -> R&D -> Status Display (#1)- > DB Service Manager (#16).

16 © 2008 Progress Software Corporation 16 Determining Optimal -Pica The larger the –pica, the further behind the target may get Monitor AI writes during busiest period for one hour -pica = (TAIW/Blockcount) * 1.25 Blockcount depends on version OpenEdge 10 – blockcount is 9.16 Progress ® 9.1x – blockcount is 18.2

17 © 2008 Progress Software Corporation 17 Sample –Pica Calculation Values up to 8192k for 10.1B01 and later TAIW over one hour Formula for OE 10: (34560/9.16) * 1.25 = Why not just use 8192???

18 © 2008 Progress Software Corporation 18 Houston, we have a problem - Promon 03/03/08 Status: Database Service Manager 17:15:02 Communication Area Size : KB Total Message Entries : Free Message Entries : 4 Used Message Entries : Registered Database Service Objects Name Rdy Status Messages Locked by OpenEdge Replication Server Y RUN OpenEdge RDBMS Y REG 0 OpenEdge DB Agent Y RUN 0

19 © 2008 Progress Software Corporation 19 Agenda Terminology and Architecture - visual Replication performance hotspots Replication availability hotspots Source and target management

20 © 2008 Progress Software Corporation 20 Availability Hotspots Primary Machine Secondary Machine Repl Agent Database Brk/Server Processes Target Database R/O Clients R/Write Clients AI Extents DB Service Q Repl Server AI Extents Source Database Database Brk/Server Processes

21 © 2008 Progress Software Corporation 21 Availability Hotspots Secondary Machine Repl Agent Database Brk/Server Processes Target Database R/O Clients R/Write Clients AI Extents DB Service Q Repl Server AI Extents Source Database Database Brk/Server Processes DOWN! Severed Primary Machine Loss of Database TCP or Process Failure Locked

22 © 2008 Progress Software Corporation 22 Availability Hotspots – AI Management Replication DOES NOT manage AI files AI Files must be emptied and backed up 10.1A AI archiver became available. Database crashes when no empty AI extents.

23 © 2008 Progress Software Corporation 23 Availability Hotspots – Locked AI Files AI locked when AI notes not replicated to the target db Common issue – often caused by simple maintenance routines and failure to monitor status of replication Configure the rpserver and rpagent to detect and handle outages All about the *.repl.properties file!! Configure, test well and sleep easier at night

24 © 2008 Progress Software Corporation 24 Availability – Many Locked AI Files Use dsrutil monitor against source and target db. Check for replication shared memory If rpagent is running, restart the replication server on the source If rpagent is not running, restart target database and restart replication server

25 © 2008 Progress Software Corporation 25 Houston, we have a problem – part 2 Extent: 1Extent: 3 Status: BusyStatus: Locked Type: Variable Length Type: Variable Length Path: C:\wrk101c\repl\source.a1 Path: C:\wrk101c\repl\source.a3 Size: 3192 Size: 6264 Used: 3180 Used: 6200 Start: Wed May 14 14:09: Start: Wed May 14 14:08: Seqno: 5Seqno: 3 Extent: 2Extent: 4Status: Locked Type: Variable Length Type: Variable Length Path: C:\wrk101c\repl\source.a2 Path: C:\wrk101c\repl\source.a4 Size: Size: Used: Used: Start: Wed May 14 13:45: Start: Wed May 14 14:08: Seqno: 2Seqno: 4

26 © 2008 Progress Software Corporation 26 Availability – All AI Files Locked Source database activity comes to a halt Can you afford to bring the db down? If not - disablesitereplication If yes – stop database – add new ai files – prostrct reorder – restart.

27 © 2008 Progress Software Corporation 27 Prostrct add sourcedb addai.st Extent: 1Extent: 4 Status: BusyStatus: Locked Type: Variable Length Type: Variable Length Path: C:\wrk101c\repl\source.a1 Path: C:\wrk101c\repl\source.a4 Size: 3192 Size: Used: 3180 Used: Start: Wed May 14 14:09: Start: Wed May 14 14:08: Seqno: 5Seqno: 4 Extent: 2Extent: 5 Status: LockedStatus: Empty Type: Variable Length Path: C:\wrk101c\repl\source.a2 Path: C:\wrk101c\repl\source.a5 Size: Size: 120 Used: Used: 0 Start: Wed May 14 13:45: Start: N/A Seqno: 2Seqno: 0 Extent: 3Extent: 6 Status: LockedStatus: Empty Type: Variable Length Path: C:\wrk101c\repl\source.a3 Path: C:\wrk101c\repl\source.a6 Size: 6264 Size: 120 Used: 6200 Used: 0 Start: Wed May 14 14:08: Start: N/A Seqno: 3Seqno: 0

28 © 2008 Progress Software Corporation 28 Prostrct reorder ai sourcedb Extent: 1Extent: 4 Status: BusyStatus: Locked Type: Variable Length Type: Variable Length Path: C:\wrk101c\repl\source.a1 Path: C:\wrk101c\repl\source.a4 Size: 3192 Size: Used: 3180 Used: Start: Wed May 14 14:09: Start: Wed May 14 13:45: Seqno: 5Seqno: 2 Extent: 2Extent: 5 Status: EmptyStatus: Locked Type: Variable Length Path: C:\wrk101c\repl\source.a2 Path: C:\wrk101c\repl\source.a5 Size: 120 Size: 6264 Used: 0 Used: 6200 Start: N/AStart: Wed May 14 14:08: Seqno: 0Seqno: 3 Extent: 3Extent: 6 Status: EmptyStatus: Locked Type: Variable Length Type: Variable Length Path: C:\wrk101c\repl\source.a3 Path: C:\wrk101c\repl\source.a6 Size: 1 20 Size: Used: 0 Used: Start: N/A Start: Wed May 14 14:08: Seqno: 0Seqno: 4

29 © 2008 Progress Software Corporation 29 Source and Target DBs Wont Synchronize Try restarting a few times. -Ma, -Mn, -n match? Changes to.properties files? If it continues to fail, contact support Source/target db log files AI files pmmgr.properties file –arguments=-logging 2

30 © 2008 Progress Software Corporation 30 Agenda Terminology and architecture - visual Replication performance hotspots Replication availability hotspots Source and target management

31 © 2008 Progress Software Corporation 31 Managing Replication – DSRUTIL Monitor and Status Not immediately obvious when a failure occurs Proactively verify replication performance and status

32 © 2008 Progress Software Corporation 32 DSRUtil Monitor DSRUTIL source/target –C monitor Attaches to replication shared memory. –Cannot connect to replication shared memory. Status = -1 Checks status of Server and Agent –Server status –Agent status

33 © 2008 Progress Software Corporation 33 DSRUtil source –C monitor OpenEdge Replication Monitor Page 1 Database: C:\wrk101c\repl\source Database is enabled as OpenEdge Replication: Source Server is: In Normal Processing Number of configured agents: 1 Delay Interval (current / min / max): 5 / 5 / 500 Recovery information: State: No recovery being performed Agents needing recovery: 0 Agents connected: 0 Agents in synchronization: 0 Transition information: Type: Manual

34 © 2008 Progress Software Corporation 34 DSRUtil target –C monitor (page 1) Database: C:\wrk101c\repl\target Database is enabled as OpenEdge Replication: Target Agent: Name: agent1 ID: 1 Host name: State: Normal Processing Ready: Yes Critical: No Method: Asynchronous Agent is waiting for: Nothing Maximum bytes in TCP/IP message: 8500 Server/Agent connection time: Wed May 14 13:48: Delay Interval (current / min / max): 5 / 5 / 500 Transition information: Type: Manual The last block received at: Wed May 14 13:51: Activity information: Blocks received: 2084 Blocks processed: 2084

35 © 2008 Progress Software Corporation 35 DSRUtil target –C monitor (page 2) Blocks acknowledged: 0 Notes processed: Transactions started: Transactions ended: Synchronization points: 33 AI Block Information: Source RDBMS Block (Seq / Block): 2 / 2516 Last Processed Block (Seq / Block): 2 / 2494 Latency Information: Repl Server behind Source DB by: 1 second(s) Current Source Database Transaction: Last Transaction Applied to Target: Target Current as of (Target, Source): Wed May 14 13:51: , Wed May 14 13:51: with delta of 000:00:00

36 © 2008 Progress Software Corporation 36 DSRUTIL Status DSRUTIL source/target –C status Return code indicates current state of replication server or agent. Good for automated scripts Grep for return code Replication User Guide provides details

37 © 2008 Progress Software Corporation 37 Managing Replication – OE Management OpenEdge Management 10.1B02/3.1B02+ remotely monitor log files 10.1B02 AdminServer running on the remote system Attach OE_DB_Replication Log File Ruleset to the log file monitor Alert/ thrown when message violating rule set appears.

38 © 2008 Progress Software Corporation 38 OE Management – Replication Log File Rule Set

39 © 2008 Progress Software Corporation 39 Summary Terminology and Architecture Replication performance hotspots Replication availability hotspots Source and target management

40 © 2008 Progress Software Corporation 40 Success With Replication Understand the architecture Know your requirements Analyze your system Plan, Configure, Monitor Succeed

41 © 2008 Progress Software Corporation 41 For More Information, go to… PSDN Knowledge Centrum ( esupport.progress.com) esupport.progress.com 3.1B01/10.1B01 upgrade: P122926, P123418, P123420, P123424, P123426, P123427, P sizing –pica: P Documentation OpenEdge Replication 10.1C docs (www.psdn.com)www.psdn.com OpenEdge Management 3.1C docs (www.psdn.com)www.psdn.com

42 © 2008 Progress Software Corporation 42 Questions ?

43 © 2008 Progress Software Corporation 43 Thank You

44 © 2008 Progress Software Corporation 44


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