Highly Available Data Management in Visual Studio .NET

Encoding Denso QR Bar Code in Visual Studio .NET Highly Available Data Management
Highly Available Data Management
Recognizing Denso QR Bar Code In VS .NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in .NET applications.
Database and Application File System (or Raw Disk) Software RAID and Volume Mgmt Hardware RAID Storage Area Network Physical Disks Figure 7.2 The data management layers.
Printing QR In .NET Framework
Using Barcode generator for Visual Studio .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
We have illustrated this layered model to demonstrate the independence between each of the layers. The choice to use, for example, a SAN should not in any way impact the choice of one application over another. Hardware RAID does not necessarily eliminate the need for Software RAID, and vice versa.
Recognize QR Code ISO/IEC18004 In .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
Disk Hardware and Connectivity Terminology
Barcode Creation In VS .NET
Using Barcode encoder for .NET framework Control to generate, create barcode image in Visual Studio .NET applications.
In this section we introduce some disk hardware terminology.
Barcode Decoder In VS .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
SCSI
QR Code ISO/IEC18004 Creation In C#.NET
Using Barcode maker for .NET Control to generate, create QR Code 2d barcode image in Visual Studio .NET applications.
Small Computer Systems Interfaces, or SCSIs, come in many varieties: Narrow SCSI, Wide SCSI, and UltraSCSI, each of which refers to the amount of data that can be sent across the bus (data cable or transport) in parallel. Narrow is 8 bits, Wide is 16 bits, and Ultra is 32 bits; the wider the bus, the faster the data can get across it. Theoretical maximum speed for Narrow is 10MB/second, for Wide is 20MB/second, and for Ultra Wide is 40MB/second; in reality, top speeds will usually run 10 to 15 percent slower because of the overhead of the SCSI data transport protocol. In addition, there are differential and singleended SCSI varieties, and Ultra, Fast, Fast/Narrow, and Fast/Wide SCSI varieties. There are speed enhancements being made all the time, with transfer rates usually doubling with each enhancement. We have attempted to create an exhaustive list of SCSI varieties, but we may have missed one or two: SCSI-1. This is the original SCSI technology, developed in the early 1980s. It only supports 3 to 5MB/second transfer rates, and only allows one disk and one system on a bus. You d be hard-pressed to find SCSI-1 hardware on production systems today.
Encoding QR Code 2d Barcode In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
7
Print QR Code 2d Barcode In Visual Basic .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create QR Code 2d barcode image in .NET framework applications.
SCSI-2. Work started on this update in 1986. It is faster and more reliable than SCSI-1, comes in several varieties, typically has an 8-bit-wide data path, and uses a 50-pin connector. The theoretical maximum throughput of SCSI-2 is 10MB/second. Single-ended SCSI-2. This is the regular version of SCSI (so identified to separate it from Differential SCSI). Because of line noise, transfer speeds rarely exceed 5MB/second. Differential SCSI-2. Differential SCSI uses a much more complex method of transmitting signals, which results in longer supported cabling distances (up to 25 meters), easier termination, and faster transmission speeds (up to 10MB/second) because differential SCSI puts less noise on its data cables. Not all SCSI devices are compatible with differential SCSI. Fast/Narrow SCSI-2 (also called, simply, Fast SCSI-2). Cable lengths are limited to 6 meters. A 10MB/second throughput is possible. Fast/Wide SCSI-2. Fast/Wide SCSI-2 doubles the 8-bit width to 16 bits, doubling throughput to 20MB/second at the same time. Fast/Wide can come in either differential or single-ended varieties. Because 16-bit Fast/Wide uses a 68-pin connector (instead of the 57 pin that its predecessors used), it is easy to recognize. SCSI-3. At 8 bits wide, SCSI-3 (also called UltraSCSI) can transmit data at 20MB/second. Once again, SCSI-3 is available in differential or singleended varieties. Wide UltraSCSI. This takes the 8-bit SCSI-3 bus and doubles its width to 16 bits, giving it 40MB/second throughput. Ultra-2 SCSI. Ultra-2 offers 40MB/second at 8-bit widths, and 40MB/ second at 16-bit widths. It no longer comes in a single-ended variety. Wide Ultra-2 SCSI. The wider data bus allows more data, increasing throughput to 80MB/second. Ultra-3 or Ultra160. This once again doubles throughput, potentially to 160MB/second. From this point forward, all SCSI is of the wide (16-bit) variety. Ultra320. This doubles the throughput again to 320MB/second. Ultra640. This doubles it yet again, to 640MB/second. For more detailed information on these varieties of SCSI, as well as any future innovations, and other technical information, visit www.scsita.org. A SCSI bus is an electrical circuit that requires a terminator on both ends. A system generally acts as the terminator on one end. If there is only one system
Draw Barcode In .NET Framework
Using Barcode creation for .NET framework Control to generate, create bar code image in Visual Studio .NET applications.
Bar Code Encoder In .NET Framework
Using Barcode creator for .NET framework Control to generate, create barcode image in Visual Studio .NET applications.
Encode RM4SCC In .NET
Using Barcode maker for .NET Control to generate, create British Royal Mail 4-State Customer Code image in VS .NET applications.
Drawing EAN-13 Supplement 5 In C#.NET
Using Barcode creator for .NET framework Control to generate, create European Article Number 13 image in VS .NET applications.
Encoding Data Matrix ECC200 In Visual Basic .NET
Using Barcode creator for .NET Control to generate, create Data Matrix 2d barcode image in .NET applications.
Generating UPC-A Supplement 5 In Java
Using Barcode drawer for Java Control to generate, create Universal Product Code version A image in Java applications.
Code-39 Scanner In .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.