asp.net scan barcode NOTE This is by no means an endorsement for performing such rolling upgrades during peak in Software

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hours It is mentioned here to illustrate considerations for such maintenance for Exchange Server 2007 cluster nodes running CCR
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Although this may be acceptable in a cluster with additional nodes to fail over to, CCR has the limitation of being a two-node implementation The passive node isn t really passive, as in previous versions and SCC clusters It is actually busy replicating logs from the active node, inspecting them, and committing or replaying them to the replica database An extended outage of the passive node leaves the CMS without the ability to fail over to another node Additionally, an extended outage of a passive node results in accumulation of transaction logs on the active node, which cannot be truncated until they are replicated and replayed by the passive node Further, if a node is lost during maintenance and needs to be rebuilt and added again to the cluster, the seeding of database(s) will be required Seeding large databases may tax the storage subsystem and degrade performance on the active node Therefore, it is advisable to plan any maintenance to be performed on CCR nodes, test any updates or patches in a lab before applying them to production nodes, and strive to schedule such changes to occur during planned maintenance windows
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C AUTION In earlier versions of Exchange, the Cluster Administrator console or clusterexe utility
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is used to move an EVS to a passive node In Exchange Server 2007, you can move a CMS using either the cluster tools (Cluster Administrator or clusterexe utility) or the Exchange management tools (the Exchange shell and post-SP1 EMC) It is recommended that you use the Exchange management tools in a CCR environment, because these perform the necessary checks related to replication health and status that the cluster tools do not, and they block the move if they find that one or more databases may not mount due to replication issues Once these checks are done, the Exchange tools use Cluster API to move the CMS
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A CMS can be moved from an active node to a passive node using the Exchange shell in Exchange Server 2007 RTM SP1 brings this functionality to the console as well
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NOTE Using the Exchange tools to move a CMS does not move the cluster group Before
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performing maintenance on a node, make sure both the CMS and the cluster group have been moved to another node
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E-mail Continuity
To move a CMS to a passive node using the Exchange shell, use the following command:
Move-ClusteredMailboxServer CMSName TargetMachine NODE2 MoveComment "Testing Failover to NODE2"
NOTE Neither the Exchange shell nor the console allow you to move a CMS without adding a
comment This allows an organization to maintain a record of why a CMS was moved to another node
To move a CMS to a passive node using the Exchange console, use the following procedure: 1 Expand the Server Configuration node and select Mailbox 2 In the Action pane on the right, click Manage Clustered Mailbox Server This starts the Manage Clustered Mailbox Server Wizard 3 On the Introduction page, select Move the Clustered Mailbox Server to another node Click Next 4 On the Move Clustered Mailbox Server page, enter the following settings: Select target node Click Browse to select the target passive node to which the CMS should be moved Move comment Enter a brief comment indicating the reason for the move 5 On the Progress page, make sure the correct passive node is selected Click Move 6 On the Completion page, ensure the move was successful Click Finish to close the wizard
NOTE When a CMS is moved from the active node to the passive node, CCR is automatically
reconfigured to reverse the direction of replication of storage group(s) on the cluster A node functioning as a replication target when it is passive starts functioning as the replication source when it becomes active after a move No admin intervention is necessary to make this change Figure 19-13 provides more details about such a move
Configuring the Transport Dumpster
As mentioned earlier in this chapter, the Transport Dumpster is a cache of recent messages that are routed by a Hub Transport server These are delivered to a CMS after a failover, which delivers any missing messages to mailboxes The Transport Dumpster is enabled by default It retains messages for seven days, or until it reaches the default maximum size per storage group of 18MB In SP1, both these properties can be configured from the EMC by selecting Organization Configuration | Hub Transport | Global Settings tab | Transport Settings | Properties Here s how to configure these properties using the Exchange shell:
Set-TransportConfig MaxDumpsterSizePerStorageGroup 20Mb MaxDumpsterTime 800:00:00
19:
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