Brocade Communications Systems StorageWorks 4400 - Enterprise Virtual Array Uživatelský manuál Strana 18

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In the test environment, WFEs on Site B are configured as SharePoint search query servers. A copy of
the search index is replicated to each WFE, including WFEs on Site B, and they are able to provide
some search capability for the site. However, until the Index server is restored, and the content is
recrawled, the search data does not include new content. Note that the WFEs on Site B are paused in
NLB until site failover. In this configuration, WFEs on Site B do not service the SharePoint front end
when SharePoint is operating from Site A. This can be similarly implemented using a hardware load-
balancing solution or by using virtual WFE servers.
ISL link failure
When an ISL failure occurs, the behavior depends on the DR group Suspend on links down property.
For application high availability, in most cases it is best to set the Suspend on links down property to
disabled, which allows the SharePoint application to stay online in Site A in the event of an ISL
failure. If the Suspend on links down option is enabled the SQL back end, and SharePoint, is
suspended until replication can be resumed.
If Suspend on links down is disabled, the data replication group goes into logging state, because
there is no replication communication between the two arrays. All subsequent I/Os are copied to the
data replication group write history log until the log becomes full, or until the replication link between
the arrays is restored before the log becomes full. If the write history log becomes full, the data
replication group is marked to do a full copy from Site A to Site B when connectivity is restored. If the
link is restored before the data replication group is marked for full copy and resynchronizes, a delta
(merge) resynchronization occurs rather than a full copy.
The Suspend on links down property is accessed selecting the DR group properties using Command
View EVA, as shown in Figure 10.
Figure 10. Suspend on links down DR group property
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