Hp ProLiant DL980 G7 Server User Manual download pdf (Page 38)

availability. More importantly, the Availability Group feature includes support of active secondary

replicas, which dramatically improves resource utilization. Active secondary replicas perform log

backups and copy-only backups of a full database, file, or filegroup.

If a database is a member of an Availability Group, additional parameters will be displayed,

including Availability Group Name, Synchronization Status, and Replica Role. Figure 33 (page 38)

shows a sample portion of the Database page screen displaying information about Availability

Group parameters. The Replica Role is indicated within parenthesis next to the Availability Group

Name. For example, in Figure 33 (page 38), the Availability Group Agroup_SP1 is a primary

replica. Table 2 (page 38) and Table 3 (page 38) list possible synchronization states and replica

roles, respectively. Possible database status and read-only values are listed in the next subsection

in Table 4 (page 39) and Table 5 (page 39), respectively.

Figure 33 Database in Availability Group

Table 2 Possible synchronization status values

DescriptionValue

The synchronization state is Not Synchronizing.NotSynchronizing

The synchronization state is Synchronizing.Synchronizing

The database replica is synchronized with the primary.Synchronized

The database replica is reverting after a failover.Reverting

The principal database is initiating a failover.Initializing

Table 3 Possible replica roles

DescriptionRole

The Role is Resolving.Resolving

The Role is Primary.Primary

The Role is Secondary.Secondary

The Role is Unknown.Unknown

Mirrored database

Database mirroring is used for protecting application databases from planned and unplanned

downtime. Combined with log shipping and failover clustering, database mirroring effectively

meets high availability requirements of mission critical applications. A mirror database is a copy

of the primary database and typically is fully-synchronized with it. When the transaction log buffer

for the principal database is written to disk, transactions are sent directly from the principal database

and server to its mirror database and server.

If a database is configured for mirroring, Mirror Status information will be displayed, as shown in

Figure 34 (page 39). Possible values for are listed in Table 6 (page 39). Table 4 (page 39) and

Table 5 (page 39) list possible values for Database Status and Read-Only, respectively.

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Hp ProLiant DL980 G7 Server User Manual Page 38