There are two servers, how to do a dual machine hot backup

The specific steps are as follows:

1. First of all, you can use the tool shown in the figure to perform a hot backup, as shown in the figure below, and then go to the next step.

2. Secondly, it can also be obtained from the location shown in the figure. As shown in the image below, then proceed to the next step.

3. Then, install and authenticate after obtaining it, as shown in the figure below, and then move on to the next step.

4. Finally, after completing the backup rule, you can start the hot backup, as shown in the figure below. In this way, the problem is solved.

1. Dual-machine hot standby refers to the hot standby (or high availability) of two servers based on the high-availability system.

2. Take the common SQL service as an example: install the server system on two servers first.

3. Then set up one or more disk arrays to save the SQL data on the two servers on the disk array.

4. Then install a cluster software, such as: Microsoft MSCS, Symantec VCS, Atang Cluster, etc.

5. Then set up the primary and secondary servers separately on the software. For example, install Advanced Server or DataCenter Server on the MSCS. Then add the same administrator account and password on both servers.

That is, the account must have administrator permissions on each node. All nodes must be member servers, or all nodes must be domain controllers in the same domain. In a cluster, a portion of domain members and a portion of domain controllers are not allowed.

6. Then install the cluster management software, turn on the disk array, set up the shared disk on the two computers, and verify the shared disk country.

7, then shut down the first server, configure the second node, after the configuration is complete, shut down the second server, turn on the first server, configure the first node.

8. Finally, turn on the two servers and the disk array.

Dual-machine hot standby refers to the hot standby (or high availability) of two servers based on the high availability system, because the two high availability machines are used more in China, so it is named dual machine hot standby, and the dual-machine high availability is divided into active-standby mode (active-standby mode) and dual-host mode (active-active mode), and the active-standby mode refers to a server in an active state (i.e., active state) of a certain business destruction. The other server is in the standby state (that is, standby state) of the service. On the other hand, the dual-host side-search mode refers to two different services in the active-standby and standby-active states (i.e., active-standby and standby-active) on two servers respectively.

The so-called dual-node hot standby is to install the central server as two servers that back up each other, and only one server is running at the same time. When one of the running servers fails and cannot be started, the other backup service, Orange Macro, will quickly and automatically start and run. Let's take a look at the implementation process under win2000 server edition.

1. Overview of hardware preparation and basic installation.

Web servers two.

Network service network card four.

Server hard disks: Two pieces.

SCSI Disk Array a.

SCSI hard disks 3 pieces.

The first is to configure both servers as dual network cards and install win2000 advance server (advanced server version) separately. Then configure the network environment to make it smooth: join the two servers to the domain, become domain members, and set administrator privileges on each server.

In addition, it should be noted that all disks must be set up as basic disks and split into NTFS format partitions, and the disk array partitions must be larger than 2. Finally, the three SCSI hard disks are made into a disk array, and the author recommends RAID 5 (when configuring the array, it must be noted that a partition of at least 1G is separated to store the detection points and log files of the configuration database).

Second, the specific installation points.

Configure the server network environment points.

1. In the previous step, we installed dual network cards on both servers, one for connecting to the public network (Internet) and the other for connecting to the internal LAN.

Establish point-to-point communication and cluster status signals for the network card connected to the internal LAN, and then connect the cluster to the public network with the public network adapter of each terminal, where the customer resides.

2. After win2000 advanced server version is installed, start to configure the network parameters of each server. In the network connection, change the public network to "Extranet", and the LAN to "Intranet", and then specify the IP addresses of the respective network cards of the two servers as:

Server B: The public IP address is: , the private IP address is: , and the subnet mask is: The gateway is:

Installation Service Software Essentials.

Configure Server A

1. Turn off all devices before turning on the disk array.

2. Start Server A and log in to the domain with the pre-set administrator account; Then add the "Cluster Service" component to the Add Removal Program option, and note that this component is set as the first node of the cluster during the installation process, and then create the cluster name (whichever is acceptable, for example.

myserver）。

3. Since we only have a shared disk array, we should configure all the partitions in this array as cluster disks.

4. Start configuring the cluster network. Extranet.

The configuration of the two servers can be different.

Dual-machine hot standby is the smallest cluster segment cover. The mutual hot standby you mentioned should be a load balancer on the basis of two machines, both servers work, both run the same application grinding noise, to process a data, so that the pressure on the server is relatively small, the life is long, and the other works normally in the case of one down.

This is load balancing. The virtual IP is virtualized through dual-machine software, and the external connection is connected through a switch. For example, the server is now at least dual gigabit network cards, if two do dual machines, a total of 4 gigabit network ports, then two of these four network ports will be used to connect the heartbeat, in fact, it is a network cable, used to send test data to each other.

The remaining two network ports will be connected to the switch, and then virtualized into an IP through the software and the switch.

A server, also known as a server, is a device that provides computing services. Since the server needs to respond to and process service requests, generally speaking, the server should have the ability to undertake and guarantee services.

The composition of the server includes processors, hard disks, memory, system buses, etc., which is similar to the general computer architecture, but due to the need to provide highly reliable services, it has high requirements in terms of processing power, stability, reliability, security, scalability, and manageability.

3. After acquisition.

Install and certify.

4. After completion, set the backup rule to start the hot backup.

Notes:Disk mirroring is a method in which information written to a physical drive is also written to a second physical drive, also known as a hot spare. It is different from a scheduled copy between hard disks, and the mirroring is done automatically by an intelligent controller and some software.

That's right, the server runs the same applications, and if it's different, it won't take over. But you need software support for the latter two items, such as Rose dual-machine software. The software is used to virtualize one IP for two servers, and the standby server is automatically switched when one server fails.

1. The operating system of the two servers required to be the same as the installed application software.

2. There are two ways of hot standby (third-party software): data mirroring (two servers as dual machines) and shared disk type (two servers as two servers with storage as two machines).

Data mirroring type (two servers as two servers): two servers each have exactly the same data (the same data under the data partition on the two servers), one server servos, and the other server immediately takes over all applications.

Shared disk type (two servers are connected to storage as two machines): two servers have access to one piece of data (data is stored on storage), one server servos, and the other server immediately takes over all applications.

3. The virtual IP is set on the dual-machine hot standby software, no matter which server servo will not affect the client's normal access to the application, and the IP address of the client connection is always guaranteed.

What is this server used for? If it's Oracle, you can take advantage of Oracle RAC. If you want to use other Windows applications, you can create a Windows cluster. Linux clusters can also be created.

The key is what you are doing with this? If it is a VMware virtualization environment, you can get an enterprise enhanced version and go to FT.

Consult the special dual-machine hot standby, the dual-machine hot standby is that one server goes down and the other server automatically takes over, the software needs to be supported by the operating system, and the operating system cannot be installed on the array. The array is only a stack of hard disks, which is connected to the server and can be equivalent to the server's local hard disks. However, server-to-array data backups can be done.

It's better to find a professional solution, knowledge is only enough for reference and learning.

For server administrators, server failure may be the most serious problem, because there are many reasons for server failure, it may be equipment failure, it may be operating system failure, and it may be software failure. Dual-machine hot standby refers to the hot standby (or high availability) of two servers in the high-availability system, because the high-availability of the two machines is used more in China, so it is named dual-machine hot standby, and the high-availability of the dual-machine is divided into active-standby mode and dual-host mode (active-active mode) according to the switching mode in the work: active-standby mode and dual-host mode (active-active mode), and the active-standby mode refers to a server in the active state of a certain business (i.e., active state). The other server is in the standby state (that is, standby state) of the service.

In dual-host mode, two different services are in the active-standby and standby-active states (i.e., active-standby and standby-active) on two servers. For some important systems, it is difficult for users to tolerate such a long service interruption. Therefore, it is necessary to use dual-machine hot standby to avoid long-term service interruption and ensure long-term and reliable service of the system.

The correct way to decide whether to use hot standby is to analyze the importance of the system and the tolerance of service interruption to decide whether to use hot standby. That is, how long your users can tolerate to resume service, and how much impact it will be if it can't. When considering dual-machine hot standby, it should be noted that in general, there will be a switching process for dual-machine hot standby, which may take about a minute.

During the switchover process, the service may be interrupted for a short period of time. However, when the switchover is complete, the service will resume normally. Therefore, hot standby is not seamless and uninterrupted, but it can ensure that normal services can be restored quickly in the event of a system failure, and services will not be affected.

However, if there is no hot standby, once a server fails, the service may be interrupted for several hours, and the impact on the business may be serious. Another point to emphasize is that the failure of a server is different from the failure of a switch or storage device, and its concept is much higher. The reason is that a server is a much more complex device than a switch or storage device, and it is also a complex system that includes hardware, operating systems, and application software systems.

Not only can a faulty device cause a service outage, but issues with the software can also cause the server to not function properly. It should also be noted that although other protection measures such as disk array (RAID) and data backup of the current server can protect user data to a large extent, they cannot replace the role of dual-machine hot standby.