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@Left pg foot@<:R1,1,3,8460,><:P19999,0,3 - >  Deployment Guide	Lotus Confidential

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@Right pg foot@<:R1,1,3,8486,>Lotus Confidential	Deployment Guide <:P19999,0,3 - >

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@Chapter title@<:#300,8486>Chapter 3: Planning a Notes System

<:#400,8486>Planning a Notes system includes designating servers for various Notes tasks and connecting the servers logically to achieve the most efficient communication between servers.

@Ahead@<:s><:#240,8486>About dedicating servers by task

<:s><:#800,8486>As you consider your hardware needs and think about a Notes topology, you should be thinking about how you will use your Notes servers. Although you install and configure all Notes servers in the same way, to simplify administration, most organizations dedi
cate servers to certain tasks. The following are some types of dedicated servers you might set up for your system:

@Chead@<:s><:#200,8486><:f180,BArial,0,0,0><+!>Mail servers<:f200,BArial,0,0,0> <-!><:X8,-32768;Index "Servers" # "mail">

<:s><:#400,8486><:f,BArial,>Mail servers s<:f,,>tore<:f><:f,,> user<:f><:f,,> mail databases and route mail across the network. Set up a dedicated mail server when you want to:

@Bullet@<:s><:#200,8486>Keep all mail databases on one server for easier administration

@Bullet@<:s><:#400,8486>Minimize server processor load (only a few databases, such as the Name & Address Book, Server Log,  are replicated).

@Bullet@<:#400,8486>Reduce network traffic, since mail sent between users whose mail files are on the same server is not will not be routed across the LAN

@Bullet@<:s><:#200,8486>Provide a model for predicting server performance and for grouping users (by department, etc.)

@Bullet@<:s><:#200,8486>Allow users access to other databases even when their mail server is down

@Chead@<:s><:#200,8486><:f180,BArial,0,0,0><+!>Database servers <-!><:X8,-32768;Index "Servers" # "database">

<:#400,8486><:f,,>Use a database server to store<:f><:f,,> application databases, such as discussion, tracking, news, and on-line<:f><:f,,> documentation databases<:f><:f,,>. Database servers are useful when you want to:

@Bullet@<:#200,8486>Keep all non</m>mail databases on one server for easier administration

@Bullet@<:s><:#200,8486>Group applications by their usage, replication needs, or security need for easier administration

@Bullet@<:#400,8486>Optimize server performance and response time by fine</m>tuning replication without regard to mail usage

@Bullet@<:s><:#200,8486>Ease expansion by adding new database servers as usage and storage needs increase

@hd:D@<:#200,8486><:f180,BArial,0,0,0><+!>Dial</m>in servers<:f200, Helvetica,0,0,0> 
<-!><:X8,-32768;Index "Servers" # "dial-up"><:f>

@hd:D@<:s><:#600,8486><:f,,>Dedicating a server for dial-in service allows users in remote location to access Notes via a modem. This type of server saves you the expense and administrative effort of installing and maintaining 
<:f><:f,,>servers in remote <:f><:f,,>locations. This server can be set up with mail and application databases on one server. 

@Bullet@<:#600,8486>Dedicated mail and database servers can also be dial</m>in server. A dial</m>in database server provides a single, secure point of entry for external users, such as when a company wants to give external clients using Notes access to their databases. 

@Bullet@<:#400,8486>When  a user dials in to a server, they have access only the databases on  that server, and not the databases on other servers on the network. 

@Bullet@<:s><:#200,8486><+!><[>xref to Dial-up Notes]<-!>

@Chead@<+@><:I0,0,0,0><:#200,8486><:f180,BArial,0,0,0><+!>Passthrough<-!><:f><+!><:f180,BArial,0,0,0> severs 
<-!>

<+@><:I0,0,0,0><:#400,8486>A passthrough server is a server<:f180,BArial,0,0,0> that allo<:f><:f180,BArial,0,0,0>ws users to connect to a desired server without knowing all of the routing steps required to make the connection. 
<:f>

@Bullet@<+@><:I0,0,0,0><:#400,8486><:f180,BArial,0,0,0>By dialing into a passthrough<:f><:f180,BArial,0,0,0> server, a user can connect to multiple servers with a single phone connection. 

@Bullet@<+@><:I0,0,0,0><:#400,8486><:f180,BArial,0,0,0>P<:f><:f180,BArial,0,0,0>assthru servers allow clients on a LAN to connect to servers running network protocols different from their own.<:f>

@Chead@<:s><:#200,8486><+!><:f180,BArial,0,0,0>Gateway servers <-!><:X8,-32768;Index "Servers" # "gateway">

<:#400,8486><:f180,BArial,>Use a gateway server to connect<:f><:f,,> Notes and non-Notes 
<:f><:f,,>mail systems, for example, Soft<:f,,>Switch<:f,,><-&>, MHS, and SMTP. Some gateway servers convert Notes documents to another format, such as fax.

@Chead@<:s><:#200,8486><:f180,BArial,0,0,0><+!>Hub servers <-!><:X8,-32768;Index "Servers" # "hub">

<:s><:#400,8486><:f,,>Use a hub server to route mail and replicate <:f><:f,,>databases among other hub or spoke servers. Users 
<:f><:f,,>generally have no<:f><:f,,> access to hub servers.<:f>

@Chead@<:s><:#200,8486><:f180,BArial,0,0,0><+!>Null modems and bridge servers <-!><:X8,-32768;Index "Servers" # "null modem and bridge">

<:#400,8486><:f180,BArial,>Use null modems and bridge routers to<:f><:f,,> connect incompatible LAN protocols so that Notes has a path between the two LANs.

@Chead@<:s><:#200,8486><:f180,BArial,0,0,0><+!>Backup servers <-!><:X8,-32768;Index "Servers" # "backup">

<:#400,8486><:f180,BArial,>Use a backup server to store<:f><:f180,BArial,> copies of 
<:f><:f180,BArial,>databases you deem critical to users. <:f><:f,,>If 
<:f><:f,,>a<:f><:f,,> server is down, you can put a backup server<:f><:f,,> into operation until you correct the problem with the inoperative server.<:f>

@Ahead@<:s><:#240,8486>About connecting Notes servers

<:s><:#800,8486>An important part of planning a Notes deployment is deciding how to arrange servers and workstations to achieve the most effective use of Notes in your organization.  Server topology refers both to the physical connections linking servers and workstations a
nd to the logical way your Notes servers are connected by documents in the Public Name & Address book.<+!>  <[>xref to connection docs]<-!>

<:#800,8486>Server topology is a key part of routing mail and exchanging updates between copies of databases, a process called replication. The goal when connecting servers logically is to pass information from an originating point to its destination with the fewest nu
mber of "hops" through intermediary servers. Replication and routing usually share a common path to cut down on administrative work.

@Bhead@<:s><:#220,8486>Types of server topologies

<:s><:#1000,8486>Notes servers can be set up to replicate and route in a variety of ways, depending on the number of servers, their locations, and how often the servers need to be updated. One goal is to minimize the number of hops, and thus the amount of time and the amoun
t of network usage, required to replicate or deliver mail. Another is to simplify maintenance of the Name & Address Book by having fewer server connection documents.

<:s><:#200,8486>The most common replication topologies are: 

@Bullet@<:s><:#200,8486>Hub and spoke 

@1st lev para@<:s><:#400,8486>A central server, the hub, replicates with spoke servers in turn. This topology is common in large sites and is the most easily scaled.

@Bullet@<:s><:#200,8486>Binary tree 

@1st lev para@<:s><:#600,8486>One server replicates with two servers at a lower level, and those two replicate with two servers each, and so on, until replication is complete. Tree topology is an advantage in international organizations where distances between locations and local countr
y issues are a consideration.

@Bullet@<:s><:#200,8486>Peer to peer 

@1st lev para@Each server replicates with every other server. This topology is best reserved for small organizations that have only a few servers. It is the most limited in terms of scalability.<:p<* >>

@Bhead title@<:s><:#220,8486>About hub-and-spoke topology

<:s><:#200,8486><:X8,-32768;Index "Hub and Spoke topology" #><:X8,-32768;Index "Topology" # "hub and spoke"><:f,,><+!><[>need SSPG figure 4-1 here]<-!>

<:s><:#800,8486><:f,,>Hub-and-spoke topology refers to one or more servers, designated as hubs, that<:f><:f,,> replicate with spoke servers. The hub server calls each spoke server in turn according to schedule you create, and performs replication. In the above diagram, rep
lication of hub A takes place with the spokes first, in this order: B, C, D, E, F, G, and finally when A has finished replicating with its spokes, with hub X.

<:s><:#200,8486><:f,,><+!><[>xref to how to set in AG]<-!><:f>

@Chead@<:s><:#200,8486><:X8,-32768;Index "Hub servers" # "advantages"><:f,,>Advantages of hub-and-spoke topology<:f><:f,,>:

@Bullet@<:s><:#200,8486>Connects many Notes servers together in an efficient manner

@Bullet@<:#600,8486>Allows centralized Public Name & Address Book administration, because the Access Control List of the PNAB lists the hub as manager and the spokes as readers, requiring only a one</m>way connection, that is, the hub calls the spokes.

@Bullet@<:#400,8486>Facilitates mail routing and database replication across multiple LANs and over WANs <[>Reviewers: why is this true?]

@Bullet@<:#600,8486>Most intra</m>domain transactions on the LAN are a maximum of two hops away, for example, server to hub to server. Mail routing is peer to peer in the same domain, and all mail servers in this configuration are only one hop away.

@Bullet@<:s><:#400,8486>A hub can be used to bridge two networks running different protocols if the hub server runs both protocols

@Bullet@<:#400,8486>Can be designated as mail hubs or replication hubs. Mail</m>only hubs can be used to route mail to gateway servers while replication hubs can perform scheduled replications.

@hd:D@<:s><:#200,8486><:f200, Helvetica,0,0,0><+!>About hub servers in various environments 
<-!><:f>

@art:cap@<:s><:#200,8486><+!><[>Need SSPG fig 4-2 here]<-!>

@Chead@<:s><:#200,8486>Hub server in single LAN environment

<:s><:#400,8486>In a single LAN environment, the hub server connects directly to spoke servers or other hubs on the network. The spoke servers provide replication and mail routing services to user workstations.

@art:art@<:s><:#200,8486><+!><[>Need SSPG fig 4-3 here]<-!>

@Chead@<:s><:#200,8486>Hub server in dual-protocol environment

@hd:D@<:s><:#200,8486>

@Chead@<:s><:#200,8486><:f180,BArial,0,0,0><+!>Hub servers in remote environments <-!><:f>

<:s><:#800,8486><:X8,-32768;Index "Network" # "multiple"><:X8,-32768;Index "Hub servers" # "remote environments"><:f,,>Hub servers 
<:f><:f,,>often <:f><:f,,>connect Notes servers on different network operating systems or topologies (e.g., a wide area network). Mail is routed and databases are replicated between one network server to the hub, then from the hub to a server on the other n
etwork. The hub server contains both sets of protocols, and replica copies of every common database between the different networks.

@art:art@<:s><:#200,8486><+!><[>Need SSPG fig 4-4]<-!>

@Chead@<:s><:#200,8486>Hub Server in Remote Environment

The hub server connects field office LANs and a remote hub server via dial</m>up lines.<:p<* >>

@Bhead title@<:s><:#220,8486>About binary tree topology

<:s><:#200,8486><[>Need SSPG fig 4-5 here]

<:s><:#1000,8486><:X8,-32768;Index "Topology" # "binary tree"><:X8,-32768;Index "Binary tree" # "topology"><:f,,>Binary tree topology arranges servers in a pyramid<:f><:f,,> configuration where one server replicates<:f><:f,,> with two servers on the next level down, and tho
se two replicate with two more, and so on. Servers at the top of the pyramid 
<:f><:f,,>replicate with each other after they have finished replicating with the servers beneath them<:f><:f,,>. Because of the time required for information to travel from the top of the pyramid to the bottom, this topology is generally less efficient tha
n hub and spoke.

<:#400,8486>Binary tree topology works well in international organizations where distances between locations and local country issues are a consideration.

@Bhead title@<:#220,8486>About Peer</m>to</m>Peer Topology

@art:art@<:s><:#200,8486><[>Need SSPG fig 4-7 here]

<:#800,8486><:f,,>In a peer-to-peer arrangement, connection documents on each server schedule replication with every other server in a domain.<:f><:X8,-32768;Index "Topology" # "peer to peer"><:f,,> The peer-to-peer topology works best for small sites with just a few s
ervers. <:f>Using a peer-to-peer topology with a larger number of servers requires the uses of many connection documents and is a highly inefficient way to pass information around.

@Ahead@<:#240,8486><:f,,>About fitting Notes into an existing network

<:#200,8486><:f180,BArial,255,0,0><+!><+"><[>Need a topic here<-!><-"><:f><+!><+"><:f180,BArial,255,0,0>]<-"><-!><:f>

@Ahead@<:s><:#240,8486>About server capacity and scalability

<:#200,8486><:f180,BArial,255,0,0><+"><+!>The server capacity info is not yet available and is changing dramatically. More on this later.<:f><-"><-!>

<:s><:#200,8486><+!><+"><:f180,BArial,255,0,0>Reviewers: what are some other points to make about planning for scalability?<-!><-"><:f>

<:#1000,8486>The scalability, that is, the expansion, of your Notes system depends on how well you plan for growth. For example, if you initially deploy your system with just a few servers and decide on a peer-to-peer topology for server-to-server communication, you mig
ht need to rethink your topology as you add servers. Additionally, you might need to upgrade your network and computing infrastructure as you add servers and users.

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