asp net c# barcode generator Exchange s Search for High Availability in C#

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You might arrive at a situation where you want to change the location of the FSW. Perhaps the server is unavailable for some reason or it is more productive to relocate the FSW to another server. In this case, you can use the Set-DatabaseAvailabilityGroup cmdlet to update the properties for the FSW. This example command moves the FSW to a server called ExServer22 (which cannot be a member of the DAG) and specifies a directory on that server to host the resource:
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8 Exchange s Search for High Availability
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mailbox servers that have to handle a substantial replication load can be configured with multiple replication networks. You can also use the Get-DatabaseAvailabilityGroupNetwork cmdlet to view the network information for a DAG. For example:
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Get-DatabaseAvailabilityGroupNetwork Identity DAG-Dublin | Format-List
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Name Description Subnets Interfaces MapiAccessEnabled IgnoreNetwork Identity IsValid
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: DAGNetwork01 : : {{192.165.65.0/24,Up}} : {{ExServer1,Up,192.165.65.50}, {EXSERVER2,Up,192.165.65.60}} : True : False : DAG-Dublin\DAGNetwork01 : True
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ReplicationEnabled : True
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Figure 8-15 Viewing the network used by a simple DAG.
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When you use two NICs, the MAPI network is assigned to one network and the replication network is assigned to the other NIC. As you add more NICs, you increase the network capability for the replication network. When a server is configured with more than one replication network, Exchange attempts to direct traffic across the least used network to maximize available network resources. Microsoft recommends that you use Gigabit Ethernet NICs in production Exchange 2010 mailbox servers. If you elect to use multiple networks, the same configuration must be used for every server in the DAG. Using multiple NICs provides better resilience against failure: If the replication
Day-to-day DAG management and operations
network becomes unavailable for some reason, Exchange will automatically revert to using the MAPI network for both sets of network traffic and you won t have to deal with a server outage. Once the replication network is restored to health, Exchange will automatically start to use it again. However, the server won t be able to function as a member of the DAG if the MAPI network fails and, in this case, Exchange will failover the active databases from the server to other members of the DAG. As previously discussed, when we created the DAG with the New-DatabaseAvailabilityGroup cmdlet, we specified an IP address to use to identify the Windows cluster resource that underpins the DAG (we could also have leased an address using DHCP). This IP address is registered in DNS and is the one used by the MAPI network. Assigning a single IP address to the DAG is sufficient as long as all the mailbox servers within the DAG share the same subnet. However, if the DAG spans several IP subnets, you must specify an IP address in each subnet for the cluster resource to allow servers in that subnet to participate in the DAG. Apart from MAPI communications, the IP address is needed to allow the cluster group to move between the servers within the DAG. This cannot happen if the cluster doesn t know about all of the IP subnets used by DAG members.
INSIDE OUT
A note about latency
The existence of multiple subnets implies different geographic locations and the sole requirement is that the round-trip network latency between member servers in the DAG must be less than 250 milliseconds . This isn t a difficult requirement in that your DAG will immediately fail once latency exceeds the limit . Instead, if your latency exceeds 250 milliseconds, you can expect that queues of transaction logs will accumulate during peak production hours and that any network outage or other operation that generates a lot of network activity will result in even larger queues that Exchange has to clear to bring database copies up to date . In some instances, large queues can build up even when latency is less than 250 milliseconds and you might need to increase network capacity so that logs are replicated quickly .
Multiple subnets are also required if you deploy a DAG across multiple Active Directory sites. This is not an issue providing that the network requirements are met and that Active Directory replication is functioning normally. After you create the DAG, make sure that its object has been replicated to the domain controllers in the remote site before you attempt to add subnets or servers in that site. A default gateway must exist for all networks if you specify an IP address for the DAG. In addition, if you use Microsoft Internet Security and Acceleration Server (ISA) or a similar
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