Cisco Cisco UCS B420 M4 Blade Server Libro blanco
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Figure 4. Microsoft SQL Server Single-Host Deployment Model
Microsoft SQL Failover Cluster Deployment Model
The Microsoft SQL cluster deployment model allows one Microsoft SQL Server to take over the tasks and
responsibilities of another Microsoft SQL Server that has failed. This model helps ensure that users running
mission-critical applications experience little or no downtime when such a failure occurs. Downtime can be very
expensive, and the database administrator can help reduce it as much as possible. Microsoft SQL Server
clustering is a high-availability technology for Microsoft SQL Server instances. It involves the sharing of server
resources between one or more nodes (or servers), which have one or more shared disks grouped into logical
units called resource groups. A resource group that contains at least one IP address, network name, and disk
resource is called a virtual server. The cluster service arbitrates ownership of the resource groups. A single node
can own a resource group and its associated resources at any given time.
The Microsoft SQL cluster deployment model allows one Microsoft SQL Server to take over the tasks and
responsibilities of another Microsoft SQL Server that has failed. This model helps ensure that users running
mission-critical applications experience little or no downtime when such a failure occurs. Downtime can be very
expensive, and the database administrator can help reduce it as much as possible. Microsoft SQL Server
clustering is a high-availability technology for Microsoft SQL Server instances. It involves the sharing of server
resources between one or more nodes (or servers), which have one or more shared disks grouped into logical
units called resource groups. A resource group that contains at least one IP address, network name, and disk
resource is called a virtual server. The cluster service arbitrates ownership of the resource groups. A single node
can own a resource group and its associated resources at any given time.
The Microsoft SQL Server cluster deployment model is shown in Figure 5. Two nodes that are members of the
Microsoft Windows 2008 R2 failover cluster service are deployed on VMware ESX virtual machines on two
separate Cisco UCS blades. Both VMware ESX and the guest virtual machine (Microsoft Windows 2008 R2) are
booted from a logical unit number (LUN) hosted on a NetApp FAS3270 with access through the iSCSI protocol.
Microsoft Windows 2008 R2 failover cluster service are deployed on VMware ESX virtual machines on two
separate Cisco UCS blades. Both VMware ESX and the guest virtual machine (Microsoft Windows 2008 R2) are
booted from a logical unit number (LUN) hosted on a NetApp FAS3270 with access through the iSCSI protocol.