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If you are familiar with NLB in Windows 2000, then you already know that past versions of NLB spread requests across a cluster according to the IP address and port address range on a whole-cluster basis Although technically this made administration of the cluster easier, it also limited a cluster to a very specific range of websites In particular:
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CHAPTER 8 Planning Server Availability and Performance
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Each member of the cluster was limited to supporting the set of traffic defined by the cluster All members of the cluster had to support traffic for all the websites or applications they hosted, even if you didn t want all websites to be load balanced You had to block all applications on a cluster member, not just specific applications
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To address these problems, Windows Server 2003 includes a new feature called Virtual Clusters Virtual Clusters take into account the preceding problems and provide a number of solutions:
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Cluster IP addresses can be configured with different port address ranges, allowing one cluster IP address to redirect to a particular application being hosted on a specific port on each member For example, IP address 192168120 could refer to port 80 hosted websites on the cluster members, whereas 192168121 refers to port 8080 sites Traffic for a website or application can be filtered out on a cluster member basis, allowing upgrades on a single member with the cluster to take place without shutting down all other applications on that member
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Cluster member level affinity allows you to assign different hosts within the same cluster to handle specific web sites or applications For example, AppOne could be hosted by members one, two, and four, while AppTwo is handled by members two, three, and five
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Planning Your NLB Cluster
When planning an NLB cluster, you first identify the reason for wanting an NLB cluster What is it that you need to accomplish NLB clusters provide two different types of functionality: fail-over support, by automatically redirecting requests to an available server, and system load balancing, by spreading requests over two or more machines When looking primarily at fail-over support, you can use Table 84 to determine whether NLB is suitable
MCSE Planning a Windows Server 2003 Network Infrastructure
TABLE 84 Failure Point
Fail-Over Support Provided by NLB
NLB Suitable
Alternative Solution
Network hub
Power outage Server connection Disk failure Other hardware failure Server software failure IIS failures/interruptions Web application failure WAN links
No Yes Yes Yes No Yes Yes No
Redundant networks (may be achievable if using multiple network adapters and multiple NLB layers that is, two NLB networks that are themselves protected by a secondary NLB that provides the public interface UPS/Generator Second network interface Hardware/software RAID Hot swap components Cluster Service
Redundant links
For determining whether NLB is appropriate for traffic loading, we have to look deeper at the specific application and how NLB can be used to spread the load NLB can distribute TCP and UDP requests, and its primary use is in distributing the following protocols:
HTTP HTTPS FTP TFTP SMTP RDP
Web services handled by IIS, typically on port 80 Secure web services, port 443 For BOOTP and similar services, port 69 For email transfer, port 25 For Terminal Services, port 3389 Ports 20/21 and 1024 65535
How you use NLB depends on the exact application and requirements There are, however, three main aspects to the successful configuration of an NLB cluster: the execution model, capacity planning, and optimization
Execution Model
NLB clusters support four execution models, based on the number of network adapters and the operating mode for the cluster:
CHAPTER 8 Planning Server Availability and Performance
Single network adapter per server in unicast mode (SU) This model is suitable for clusters where direct communication between nodes is not required and where there is limited traffic to specific member nodes outside of cluster traffic that is, the server is wholly dedicated to servicing the cluster Multiple network adapters per server in unicast mode (MU) This model is suitable when communication with other members is required You can also use this model when you want to separate inter-member and client/cluster communication Single network adapter per server in multicast mode (SM) This model is suitable when inter-member communication is required but where there is limited cluster-related traffic handled by each server This is ideal for individual servers that have a higher usage in an individual capacity, but where clustering is used for a specific low-use fail-over application Multiple network adapters per server in multicast mode (MM) This model is suitable when inter-member communication is required and where there is a high level of cluster-related traffic
We can actually resolve this down further by looking at specific examples, shown in Table 85 I ve used the two-letter abbreviations from the preceding list as column headers In the table, Yes means the model is ideal, No means the model is unsuitable, and Possibly means that it may suitable, but is not ideal
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