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Lotus Notes Traveler provides two-way, over-the-air synchronization between Lotus Domino servers and Microsoft Windows Mobile, Nokia S60, and Apple (iPhone and iPod Touch devices). Lotus Notes Traveler synchronizes email, calendar, to-do, address book, and journal data in real time. The Lotus Notes Traveler server runs as a Lotus Domino server task and is installed on a server running Lotus Domino. The Lotus Notes Traveler server task uses the Lotus Domino directory to automatically look up and find Lotus Notes users. You can get more information about Lotus Notes Traveler.
For this study, two Lotus Domino servers were used. One server hosted the Lotus Notes Traveler server task, and the other server hosted the user mail database.
Figure 1 shows the testing configuration.
Figure 1. Testing configuration
The test strategy is to simulate a typical enterprise custom messaging load and then add mobile devices to that environment. The NotesBench workload generators simulate Lotus Notes client activity by sending mail to random users in the test set and causing other activity on the Lotus Domino mail server. The mobile devices are added into this mix using the device simulators, which keep the changes generated by NotesBench synchronized with the client and simulate user actions on the mobile device.
Lotus Notes Traveler 8.5.1 performance
The performances of the Lotus Notes Traveler server and the Lotus Domino mail server were measured using the Lotus Notes Traveler and N8Mail workloads on the Microsoft Windows 2003 64-bit server operating system. The Lotus Notes Traveler server was on a separate server from the Lotus Domino mail server, and it was exercised by test systems that simulated mobile devices. The driver systems ran scripts that simulated remote devices reading and sending mail messages.
Here are the details the Lotus Notes Traveler client script:
There are 64 iterations of this loop with a 15-minute wait between iterations. Each user starts on a random iteration count (first, fifth, and so on), and each user runs for the entire 64 iterations.
- OPEN/READ five Inbox mails (every iteration)
- Reply to the first mail (every second iteration)
- SEND one 10-byte mail to one person (every eighth iteration)
- SEND another 10-byte mail to three people (every eighth iteration)
- MOVE one mail from the Inbox to the NotesBench folder (every iteration)
- DELETE two mails (every iteration)
In addition to the user scripts, the Lotus Notes Traveler clients listen for auto-synchronized messages from the Lotus Notes Traveler server. If email or calendar data changed on the server as a result of the NotesBench load drivers, then the Lotus Notes Traveler client automatically synchronized the server changes to the device.
All tests for Lotus Notes Traveler 8.5.1 were done for Windows Mobile 5 (WM5) and Windows Mobile 6 (WM6) and for Apple devices. Nokia devices use the same protocol (SyncML) as the Windows Mobile devices and have similar performance characterstics. Apple devices use a different synchronization protocol (Active Sync) and have different performance characteristics than the Windows Mobile and Nokia devices.
For tests for Lotus Notes Traveler 8.5.1, WM5 and WM6 devices were simulated with 40 percent mail formatted as plain text (WM5) and 60 percent mail formatted as rich text (WM6).
We also ran 100 percent Apple device simulation and mixed load with 50 percent Windows Mobile device and 50 percent Apple device load.
Lotus Domino 8.5.1 server workload
The N8Mail workload that was run on the Lotus Domino 8.5.1 mail server simulated users sending mail using a Lotus Notes 8.5.1 client. This workload is part of a NotesBench workload suite that is part of the tools NotesBench and Server.Load (included as an installation option in the administrator client). For more information about the details of the N8Mail workload, see the developerWorks® Lotus article, “IBM Lotus Notes V8 workloads: Taking performance to a new level.”
For these measurements, the N8Mail workload simulated 4000 Lotus Notes clients sending mail to as many as 6000 mail users (4000 plus the number of mobile device users). The additional 2000 mail users (or as otherwise noted) were the Lotus Notes Traveler registered mail users. These measurements simulate a customer environment in which mail users use either a Lotus Notes client or a Lotus Notes Traveler device but not both at the same time.
All our tests are lab measurements; therefore, the results might differ from those of the real customer environments. For assistance with capacity planning, consult with the IBM TechLine team, which does capacity planning for new hardware.
IBM Lotus Notes Traveler 64-bit server configuration and results
Lotus Notes Traveler 8.5.1 server (64-bit) was set up as a single Lotus Domino partition server on an IBM eServer™ xSeries® 3550 running Windows 2003 64-bit Enterprise Server with four dual-core processors and 8 GB of physical memory. Network access was through a single 1 GBit Ethernet adapter running in full-duplex mode.
Tables 1 and 2 show the hardware and software configurations for the Lotus Notes Traveler 64-bit server.
Table 1. Hardware configuration for Lotus Notes Traveler 64-bit server
|Processors for test / speed||4 Xeon (dual core) at 3.2 GHz|
|Installed memory||8 GB|
|Active physical drives||2 disks, 73 GB each, 10000 RPM, 320 MB|
|Active logical volumes||N/A|
|Operating system||Microsoft Windows 2003 Server Enterprise (64-bit)|
Table 2. Software configuration for Lotus Notes Traveler 64-bit server
|Notes.ini settings||To increase the Lotus Notes Traveler initial size of javaheap|
|Used for all tests||NTS_Java_Parms=-Xms625M -Xmx625M|
|Persistent connections timeout||310 seconds|
|Output timeout||310 seconds|
|TSS_SYNC_THREADS||1.2 times number of devices|
|WORKER_THREADS ACTIVE_THREADS||2 times SYNC threads|
1.2 times number of devices
The Lotus Notes Traveler server must be tuned for the number of active users that it supports. The settings changed for this test are indicated in table 2. See the performance tuning section of the Lotus Notes Traveler 8.5.1 Information Center for more information.
In addition to these tuning parameters, to accommodate more devices on the same server, the following Windows TCP/IP stack changes were needed in the local registry:
- [HKEY_LOCAL_MACHINE \System \CurrentControlSet \Services \Tcpip
MaxUserPort = 15000
This value was increased from 5000 to 15000 for our test.
- [HKEY_LOCAL_MACHINE \System \CurrentControlSet \Services \Tcpip
MaxFreeTcbs = 10000
This value was increased from 2000 to 10000 for our test.
- [HKEY_LOCAL_MACHINE \System \CurrentControlSet \services \Tcpip
MaxHashTableSize = 512
This value was increased from 512 to 2650 for our test.
- [HKEY_LOCAL_MACHINE \SYSTEM \CurrentControlSet \Services \Tcpip
EnableConnectionRateLimiting = 0
Figure 2 shows the processor resource utilization for the Lotus Notes Traveler 8.5.1 64-bit server on 64-bit Windows 2003 at Windows Mobile and Nokia simulated user loads. Figure 3 shows the processor resource utilization for Apple devices and a mixed device workload.
Figure 2. Lotus Notes Traveler 8.5.1 64-bit configuration: Percent processor busy
Figure 3. Lotus Notes Traveler 8.5.1 64-bit configuration: Percent processor busy
Table 3 shows the memory usage for different types of loads.
Table 3. Memory usage for different types of loads
|Type of test||Memory usage in MB||Comments|
|2000 Windows Mobile devices||1600||WM5 and WM6 devices|
|2000 mixed devices||1550||50 percent WM and 50 percent Apple devices|
|1500 Apple devices||1500||N/A|
Table 4 shows the mix of WM5 and WM6 users for the tests shown in figure 2.
Table 4. Mix of users for each of the Lotus Notes Traveler user loads
|Total number of users||Number of WM5 users||Number of WM6 users|
For the measurements done to obtain the results in figures 2 and 3, the Lotus Domino mail server ran at a steady state of 4000 N8Mail users, and the number of Lotus Notes Traveler users was incremented as shown in the figure. The Lotus Domino mail server was configured for 6000 mail users, out of which 4000 mail users simulated Lotus Notes client traffic using the N8Mail workload. The number of Lotus Notes Traveler users simulating device traffic was then increased from 1000 users to 2000 users. For a mixed load of 2000 users, we used 1000 WM and 1000 Apple users.
Table 5 shows several key resource utilization metrics on the Lotus Notes Traveler server at a load of 2000 active Lotus Notes Traveler Windows Mobile users and 4000 active Lotus Domino N8Mail users.
Table 6 shows similar metrics on the Lotus Notes Traveler server at a load of 1500 active Lotus Notes Traveler Apple device users and 4000 Lotus Domino N8Mail users.
Table 5. Resource usage at 2000 active Lotus Notes Traveler Windows Mobile users and 4000 Lotus Domino N8Mail users
|Processor percent busy||46|
|Total disk reads/second||0.15|
|Total disk writes/second||393|
|Lotus Notes Traveler server virtual memory (Mbytes)||1603|
|Network bytes / second||1766|
Table 6. Resource usage at 1500 active Lotus Notes Traveler Apple device users and 4000 Lotus Domino N8Mail users
|Processor percent busy||51.21|
|Total disk reads/second||0.05|
|Total disk writes/second||275|
|Lotus Notes Traveler server virtual memory (Mbytes)||1498|
|Network bytes / second||3102|
Comparison between Lotus Notes Traveler 8.5.1 and Lotus Notes Traveler 8.5
Comparing Lotus Notes Traveler 8.5 and 8.5.1 can be done only based on the Windows Mobile device load. Lotus Notes Traveler 8.5 did not support Apple devices.
Figure 4 shows the processor resource utilization of the Lotus Notes Traveler 8.5.1 64-bit server compared to the same load on Lotus Notes Traveler 8.5 64-bit server on 64-bit Windows 2003.
Figure 4. Processor usage of Lotus Notes Traveler 8.5 and 8.5.1
Figure 5 compares the memory usage of Lotus Notes Traveler 8.5 and 8.5.1 for 1000 and 2000 Windows Mobile devices.
Figure 5. Memory usage of Lotus Notes Traveler 8.5 and Lotus Notes Traveler 8.5.1 for 1000 and 2000 Windows Mobile devices
Lotus Domino mail server configuration and results
Tables 7 and 8 show the hardware and software configurations for the Lotus Domino mail server.
Table 7. Hardware configuration
|Processors for test / speed||4 Xeon (dual core) at 3.0 GHz|
|Installed memory||12 GB|
|Active physical drives||42 disks|
|Active logical volumes||6 arrays of RAID 0|
|Operating system||Windows 2003 Server Enterprise 64-bit|
Table 8. Software configuration
|Used for all tests||server_pool_tasks=80|
The mail server runs Lotus Domino 8.5.1 32-bit server set up as a single Lotus Domino partition server on an eServer xSeries 3850 running Windows 2003 64-bit Standard Server, with four dual-core processors and 12 GB of physical memory. The storage configuration was an IBM DS4000® series (FAStT) hardware array with 42 disk drives. The Lotus Domino executable files were installed on one RAID 0 logical volume of 200 GB. The mail databases were spread across three RAID 0 logical volumes, each 800 GB. Mail journaling was set up on a separate logical volume. Network access was through a single 1 GBit Ethernet adapter running in full-duplex mode.
Figure 6 shows the processor resource utilization on the Lotus Domino mail server at various Lotus Notes Traveler Windows Mobile user loads and 4000 N8Mail users. This utilization was measured with the 64-bit Windows 2003 server configuration for Lotus Notes Traveler Server 8.5 64-bit server.
Figure 6. Processor utilization on the Lotus Domino 8.5.1 mail server
When increasing the number of Lotus Notes Traveler Windows Mobile users from 1000 to 2000, we measured a 4 percent relative processor usage increase on the Lotus Domino mail server that directly correlated with the load we had on the Lotus Notes Traveler server. The processor overhead of enabling Lotus Notes Traveler users on the Lotus Domino mail server is moderate because of the efficient use of polling for Lotus Domino mail by the Lotus Notes Traveler server.
The performance measurements of the Lotus Notes Traveler 8.5.1 server and the Lotus Domino 8.5.1 mail server in a remote configuration show that a Lotus Notes Traveler 8.5.1 64-bit server was able to support 2000 Windows Mobile users or 1500 Apple device users, or as many as 2000 mixed users for the workloads presented in this report.
The Lotus Notes Traveler 64-bit server, with four dual-core processors and 8 GB memory, was at approximately 46 percent processor utilization and at 1.6 GB memory usage for 2000 Windows Mobile devices active users. For 1500 Apple devices active users, the processor utilization was about 51 percent and 1.5 GB memory usage.
With the Lotus Domino 8.5.1 mail server at steady state of 4000 N8Mail users and 2000 (64-bit) Lotus Notes Traveler Windows Mobile active users, processor utilization on the Lotus Domino mail server increased moderately.
To support more than 2000 active Lotus Notes Traveler users, customers need to deploy more than one Lotus Notes Traveler 8.5.1 64-bit server. The processor utilization on the Lotus Domino mail server can be monitored to ensure that the Lotus Domino mail server can handle the added activity from the Lotus Notes Traveler users at peak load.
Note that the Lotus Notes Traveler server is a memory-intensive application. Deploy Lotus Domino 64-bit servers to support large numbers of mobile device users.
Appendix 1. Notes.ini settings
Table 1. Hardware configuration for Lotus Notes Traveler 64-bit server
|Notes.Ini parameter name||Explanation|
|Create_R8_Databases||Applies to Lotus Domino 8 servers. Set it to 1 to create ODS48 databases on Lotus Domino 8 servers.|
|NSF_Buffer_Pool_Size_MB||Specifies the maximum size in bytes of the NSF buffer pool, a section of memory dedicated to buffering I/O transfers between Lotus Domino and disk storage.|
|NSF_Dbcache_Maxentries||Specifies the number of databases that a server can hold in its database cache at one time.|
|RouterDbCacheSize||Specifies the size of the router database cache used to cache mail databases in the router process.|
|SCHEDULE_NO_VALIDATE||Enables or disables whether SchedMgr validates its busytime
database entry on a daily basis, as follows: |
0 (default) - Enables validation
1 - Disables validation
|Server_MAX_CONCURRENT_TRANS||Sets the limit for the number of concurrently scheduled transactions on a server.|
|Server_Pool_Tasks||Specifies the total number of physical threads in the Lotus Domino server (DbServer) threadpool.|
|Server_Show_Performance||Specifies whether server performance events are displayed on the console. Set this variable to 1 to display server performance events on the console.|
- Participate in the discussion forum.
- Read the developerWorks article, “IBM Lotus Domino 8.5 performance for IBM Lotus Notes users.”
- Read the developerWorks article, “IBM Lotus Domino 8.5 performance for iNotes users.”
- Read the developerWorks article, “IBM Lotus Notes V8 workloads: Taking performance to a new level.”
- Learn more about Lotus Notes Traveler.
- Contribute to the IBM Lotus Domino wiki.
- See the developerWorks IBM Lotus Notes and Domino product page.
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