II II in Visual Studio .NET

Draw QR in Visual Studio .NET II II
II II
QR-Code Scanner In .NET Framework
Using Barcode Control SDK for Visual Studio .NET Control to generate, create, read, scan barcode image in .NET framework applications.
Purchase a second server. Install the logical volume manager (LVM) software and filesystem on the new server. Install the clustering software on both nodes. Implement a pair of heartbeat networks between the nodes. Configure the option in the clustering software to enable automatic switchover to a standby network card. This option will protect them from the failure of a NIC by moving the IP addresses associated with that NIC to dedicated standby NIC in the same node, without requiring a system-to-system failover. The hardware requirements for these additional networks is four NICs, two per node.
Making QR Code In VS .NET
Using Barcode printer for .NET Control to generate, create QR-Code image in Visual Studio .NET applications.
II II II
Denso QR Bar Code Recognizer In VS .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
For more detailed information about clustering and failover, please see 15, Local Clustering and Failover. Estimated costs of implementation:
Making Barcode In VS .NET
Using Barcode creator for .NET Control to generate, create bar code image in .NET framework applications.
II II II
Decoding Bar Code In VS .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications.
Second server: $42,000 Two licenses and media for clustering software: $12,100 Extra NICs and cables: $4,500
Denso QR Bar Code Printer In Visual C#.NET
Using Barcode encoder for .NET Control to generate, create QR Code image in .NET framework applications.
The Value of Availability
Quick Response Code Generator In VS .NET
Using Barcode generator for ASP.NET Control to generate, create QR image in ASP.NET applications.
5 years of vendor support for the clustering software: ($3,132 per year): $15,660 Clustering software training for two students: $6,000 Clustering software implementation services: $12,000 LVM and filesystem software for the second node: $6,000 5 years of LVM and filesystem software support for the second node ($1,380 per year): $6,900
Print QR Code In Visual Basic .NET
Using Barcode encoder for VS .NET Control to generate, create Denso QR Bar Code image in .NET applications.
I I I I I I I I
EAN13 Printer In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create EAN / UCC - 13 image in .NET applications.
The total cost of implementation is $105,160. Note that these costs are for the first cluster. Additional clusters will cost less because implementation costs will drop. Once their system administrators have been trained, there will not be any need to send them to training every time they implement a cluster. Plus, after a few installs, it will probably not be necessary to employ implementation services for every cluster. Per-server costs also decline as cluster sizes increase. Because we are considering implementing clustering software, we must examine all the outages that it will affect. Table 3.2 lists the outages we will consider, along with their durations and likelihoods before the clustering software is implemented. Given all the statistics in Table 3.2, we get: RB = $75 9,360 = $702,000 The 99.644 percent availability in the last box in Table 3.2 is the level of availability that your system would attain if it had all of these outages and no others over the five-year life span of the systems. It is the best possible level of availability, given these outages. Additional outages would cause that level to drop even further. In Table 3.3, we examine the same values after the clustering software has been installed. We make the conservative assumption that we will recover from any outage in 5 minutes with a reliable failover. In reality, failover times will vary depending on your application. Some failovers will be longer than 5 minutes, whereas others will be shorter. The duration of the failover will depend mostly on the time it takes to restart the application on a different host. File service, shown in this example, is particularly adept at failing over quickly. We assume that likelihood and impact values have not changed and that only the duration of the outage is affected by the presence of clustering software.
Bar Code Maker In Visual Studio .NET
Using Barcode generator for .NET Control to generate, create barcode image in Visual Studio .NET applications.
Table 3.2 Effects of Outages before Clustering Software Is Installed BEFORE DURATION (D) 60 minutes* 100% 75% EB2 = 900 EB3 = 900 EB4 = 2,880 EB5 = 480 EB6 = 1,200 EB7 = 2,400 EB8= 0 9,360 minutes (99.644 percent availability over 5 years) 50% 100% 100% 100% 50% 0 EB1 = 600 (during the day) 120 minutes 30 minutes 24 hours (1,440 minutes)# 2 2 20 20 0 4 hours (240 minutes)** 60 minutes 4 hours (240 minutes) 0 60| | 10 10 BEFORE LIKELIHOOD (L) BEFORE IMPACT (I) BEFORE EFFECT (D L I)
Code 128C Generator In Visual Studio .NET
Using Barcode generation for Visual Studio .NET Control to generate, create Code 128 image in .NET framework applications.
OUTAGE TYPE
Create Royal Mail Barcode In .NET Framework
Using Barcode generator for .NET framework Control to generate, create British Royal Mail 4-State Customer Code image in .NET framework applications.
3
EAN128 Creator In C#.NET
Using Barcode printer for .NET framework Control to generate, create GS1-128 image in Visual Studio .NET applications.
Crash and reboot
Print Code 39 In Visual C#
Using Barcode drawer for .NET Control to generate, create Code39 image in Visual Studio .NET applications.
Crash and reboot (off-hours)
Data Matrix 2d Barcode Printer In Visual C#
Using Barcode drawer for Visual Studio .NET Control to generate, create DataMatrix image in VS .NET applications.
Scheduled reboot
Create Barcode In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Motherboard or other major hardware failure
UPC-A Reader In .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
Network card failure
Drawing Code-39 In .NET
Using Barcode creation for ASP.NET Control to generate, create Code 3/9 image in ASP.NET applications.
Application failure
Bar Code Scanner In .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET framework applications.
Scheduled maintenance
Generate Barcode In VS .NET
Using Barcode generation for ASP.NET Control to generate, create bar code image in ASP.NET applications.
Failover testing
Total effect of outages:
Assumes manual reboot, allowing time for the administrator to reach the system, reboot it, and deal with other hazards along the way. Twice a year for 5 years. The 60 minutes beyond the during the day case is to allow time for the administrator to get from home to the office, where the system is. Since the incident occurs off-hours, we assume that the impact is less than it would be during the workday. || Once a month for 5 years: a prudent rebooting schedule. # We assume that this will require opening a service call with your hardware support provider, waiting for an engineer to arrive, and an additional delay while waiting for parts to be shipped. Your mileage may vary. ** We assume that the replacement of a NIC card can be done by a good system administrator, without having to wait for an engineer or parts to be shipped. If the case is not so, then the duration will be longer than 4 hours. We are assuming that this occurs once per quarter over 5 years. This will vary on the basis of many factors, including the nature, complexity, and reliability of your application. The duration of the scheduled maintenance depends on many factors. 4 hours is a reasonable estimate. Because no failover mechanism is in place, no failover testing is required in the before case.
Table 3.3 Effects of Outages after Clustering Software Is Installed AFTER DURATION (D) 5 minutes 10 10 60 2 2 20 20 20 50% 50% 100% 100% then 50% 100% 50% EA3 = 150 EA4 = 10 EA5 = 9 EA6 = 60 EA7 = 50 EA8 = 50 416.5 minutes (99.984 percent availability over 5 years) 75% EA2 = 37.5 100% 5 minutes 5 minutes 5 minutes 2 minutes, then 5 minutes 3 minutes 5 minutes 5 minutes|| AFTER LIKELIHOOD (L) * AFTER IMPACT (I) * AFTER EFFECT (D L I) EA1 = 50 (during the day)