barcode generator project source code in vb.net SQL Server 7 Backup & Recovery in Software

Print QR-Code in Software SQL Server 7 Backup & Recovery

SQL Server 7 Backup & Recovery
QR Code Recognizer In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Quick Response Code Encoder In None
Using Barcode generation for Software Control to generate, create QR Code ISO/IEC18004 image in Software applications.
By now, you should be familiar with some of the issues related to planning for clustering. Of course, you ll be able to determine specifically how this technology will help you meet business goals only after you evaluate your own environment. With these ideas in mind, let s move on to examine the technical details of how clustering technologies work.
Reading Quick Response Code In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Encoding QR Code JIS X 0510 In Visual C#
Using Barcode encoder for .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
Clustering Technology
Generate QR Code JIS X 0510 In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
Paint QR Code JIS X 0510 In VS .NET
Using Barcode maker for .NET framework Control to generate, create QR-Code image in Visual Studio .NET applications.
Clustering offers high availability (greater uptime) through fault tolerance and load balancing (spreading the resource access load across multiple machines). Although the goal to make multiple servers act as one logical server is quite simple, the actual process can be quite complex. There are also numerous ways to cluster. With that in mind, let s look at some typical clustering technologies and how they work within a backup and recovery scenario.
Making QR-Code In VB.NET
Using Barcode generation for .NET Control to generate, create QR Code image in Visual Studio .NET applications.
Paint Barcode In None
Using Barcode creator for Software Control to generate, create barcode image in Software applications.
Network Load Balancing
Barcode Maker In None
Using Barcode creator for Software Control to generate, create barcode image in Software applications.
Make GTIN - 13 In None
Using Barcode printer for Software Control to generate, create EAN13 image in Software applications.
One type of clustering setup involves balancing the load between multiple machines at the network level. For example, many large companies employ dynamic routing devices or software to share the load between several web servers. This router automatically ensures that servers are available, before sending clients to them, and also makes decisions based on the workload of each machine. In this case, the servers themselves are unaware that any type of clustering is occurring. Similarly, clients see the cluster as a single machine. This arrangement provides for increased uptime and performance without the reconfiguration of applications. Figure 8-23 shows a sample load-balancing configuration.
Printing DataMatrix In None
Using Barcode creator for Software Control to generate, create Data Matrix 2d barcode image in Software applications.
USS Code 128 Maker In None
Using Barcode encoder for Software Control to generate, create Code 128 Code Set B image in Software applications.
Figure 8-23.
2/5 Standard Drawer In None
Using Barcode printer for Software Control to generate, create Industrial 2 of 5 image in Software applications.
Barcode Recognizer In .NET Framework
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET applications.
A load-balanced router connected to a web server array
GTIN - 12 Creator In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create UPC-A Supplement 2 image in .NET framework applications.
Code39 Maker In Java
Using Barcode creator for Java Control to generate, create Code 3/9 image in Java applications.
8:
EAN13 Creation In .NET
Using Barcode printer for ASP.NET Control to generate, create European Article Number 13 image in ASP.NET applications.
Printing Matrix 2D Barcode In Visual C#
Using Barcode encoder for Visual Studio .NET Control to generate, create Matrix Barcode image in .NET framework applications.
Advanced Data Protection Tactics
Generate Code 128 In Java
Using Barcode encoder for BIRT reports Control to generate, create Code 128C image in Eclipse BIRT applications.
Barcode Printer In Objective-C
Using Barcode printer for iPad Control to generate, create bar code image in iPad applications.
Active/Passive vs. Active/Active Nodes
Nodes in a cluster can be arranged in either of two main ways. In the active/passive configuration, cluster nodes are configured in such a way that one server is active and the other is passive. If the active server fails, the passive server automatically reconfigures itself to assume the workload of the failed server. Figure 8-24 shows you what typically occurs in an active/passive fail-over cluster. Originally, Server 1 is active and is providing services to the clients. Meanwhile, Server 2 contains a copy of all data in a shared disk configuration. When Server 1 fails, Server 2 becomes active and immediately assumes the function of Server 1. The clients continue to operate normally. A major difference between using clustering and using standby servers is that this changeover occurs without affecting any end users or requiring client reconfiguration. The problem with the active/passive fail-over scenario is that one of the machines in the cluster is effectively useless until a failure occurs. This is the problem with redundancy potential resources cannot be used to increase performance. But, what if clients could access both machines at the same time This would prevent wasting server resources and would still allow clients to connect if one of the machines fails (although performance would be decreased by approximately 50 percent). This type of configuration is known as an active/active cluster, because both machines are available for general use, but they act as one. Clients may not even be aware that two servers are participating in the cluster, and they may refer to each server by using the same logical name. Figure 8-25 provides an example of an active/active clustering configuration. Notice that the two active nodes are not providing the same resources to clients: Server 1 provides access to Databases 1, 2, and 3 while Server 2 offers access to Databases 3, 4, and 5. Regardless of whether the configuration of servers is active/passive or active/active, the network will probably need to fail-back when the primary server comes back online. Alternatively, you could have the backup server perform all the necessary functions. However, some organizations choose to reduce costs by lowering the hardware options on the fail-over server.
Figure 8-24.
Copyright © OnBarcode.com . All rights reserved.