Infrastructure and deployment notes

Web farm
A Web farm is a cluster composed of multiple Web servers. These servers run the same code and achieve Load Balancing through the Load balancer.
Advantages:

1. Easy Load Balancing
2. Servers with abnormal functions can be easily cleared.
3. The guiding load is transferred from the server with No Response
4. Transfer a slow web server in the Web Field
5. To avoid spof

Disadvantages:

1. The Web Cluster session needs to be centrally managed (database or session server ).
2. Not all requests from users are sent to the same web server for processing.
3. Managing web application logs distributed on Web servers is troublesome.

Deploy cheap web farm

1. High-speed hard disks (SCSI) are used for Web and database servers, and low-cost SATA hard disks are used for storage servers and report servers.
2. Put the MDF and LDF files on two different physical disks. It is best to put the MDF and LDF files under two different disk controllers.

13 production disasters at any time

Hard drive crashes, fever.
The hard disk speed may be more important than the CPU frequency. Hard Disk I/O will always be the performance bottleneck of the database server.
For database servers, SCSI is much better than Sata.

Controller fault.
Before receiving a server, make sure that you have a quality assurance certificate to show that all hardware on this server has been fully tested.
You can use the burnintest to run the peak test for 8 hours. pay close attention to the CPU and hard disk temperature tables to see if they will be overheated.

RAID fault.
Many raid faults are caused by data loss on the hard disk.
When purchasing a server, make sure that it uses a hardware RAID Controller.
Raid1 is suitable for web servers and RAID5 is suitable for database servers.

CPU is hot and burned out.
Tools must be used to test the CPU usage for 8 hours at 100% to ensure they can withstand the test.
In case of overheating, the monitoring system must be able to immediately turn off the server to protect other hardware devices of the system, so as not to burn out the CPU. This test should be performed each time the host supplier is changed.

Firewall error.
Firewall must be enabled. On an external Nic, you must disable file sharing with the printer.

Remote Desktop stops working after patches are installed.
In addition to remote desktop, make sure that your host supplier has KVM support to prevent Remote Desktop from being unavailable.

Remote Desktop cross-connection restriction and logon failure.
When Remote Desktop is not used, make sure that the Remote Desktop is logged out correctly (logout from the Start Menu ).

Copying files across networks results in database corruption.
Copying large files across networks is insecure, and data may be damaged at any time. Use WinRAR to compress large files in normal mode and then copy the rarfile over the network.

The production database is accidentally deleted.
Different passwords should be used for each server, and the machine name should be used as part of the password.
Do not ignore the confirmation dialog box of Remote Desktop.
Do not use the Administrator account to complete your daily work. The lower the account permissions, the safer the operation.

Windows is damaged until it is re-installed.
Microsoft's security patches are really important; otherwise, attacks will constantly torture you.
You may have to reinstall the incredible problem.
"Automatic update and installation" cannot be enabled on the product server ".

DNS error.
Make sure that the primary and backup DNS servers of the DNS service provider use different IP addresses and different IP addresses belong to different physical IP addresses.
Use dnsstuff to evaluate your DNS service provider.

Internet backbone network errors in different regions of the world
Ensure that the bandwidth service provider is connected to multiple backbone networks at the same time, and does not share the bandwidth with telecom companies, and no game servers are set up.
Use tracert to evaluate the network access of your host provider and publisher.

Select the correct host provider
When selecting a host provider, make sure that it has experts in Windows2003, iis6.0, and SQL server2005.
Ensure that the network of the host provider is in good condition.
Technical experts call 24 hours a day for 7 days.
Customizes the capabilities of the dedicated server you want.
Can provide you with a variety of software needs.
15000 rpm SCSI drive and San are available.
When selecting a host provider, you must perform a comprehensive evaluation.
Sign the service quality agreement (SLA). All services are handled in accordance with the contract.

Select a Web Site Monitoring Tool
Use tools to monitor the status of web sites and servers in real time. Hyperspin

Use various performance counters to monitor server performance