XLinux high availability server cluster solution LATCHHA

XLinux high availability server cluster solution LATCHHA-Linux Enterprise Application-Linux server application information. The following is a detailed description. Latch ha is an XLinux Latch series high-reliability server cluster system solution. Today, the smooth operation of various industries depends on computer systems. The ordering, distribution, customer service, financial settlement, insurance, and reservation of commodities all require highly reliable information service systems. This naturally requires the shorter the computer downtime, the better. Latch ha can automatically detect system faults. At the same time, if a computer is found to be faulty, latch ha will transfer all processes on the computer to the backup computer to provide uninterrupted services to the customer. Once the computer goes down, latch ha can reduce the downtime to minutes or even seconds. In addition, the system can be restored to the previous state, thus ensuring the stable operation of the computer.

Under the Protection of latch ha, computer systems no longer need to be interrupted due to hardware faults or routine maintenance. Latch ha uses these methods to provide optimal service reliability and minimize computer downtime. You know, a one-minute downtime may cause immeasurable losses to the operation of banks, railways, aviation and other industries. It also has an intelligent detection and processing system for system crashes. She uses various techniques to detect faults in hardware, storage devices, networks, and system software. At the same time, if a computer is found to be faulty, latch ha will transfer all processes on the computer to the backup computer to provide uninterrupted services to the customer.

Another key to achieving high availability is the redundancy policy. Simply put, multiple backups of hosts, network devices, and backup devices (not just simple backup machines, of course ): latch ha has multiple redundancy modes, including dual-host online standby mode, dual-host ready mode, and three-host mode. All modes support various backup resources, such as file systems, databases, network IP addresses, system processes, SCSI devices, and NFS. In addition, the implementation of high availability also requires a wide range of application support: latch ha can be applied in a variety of centralized, client-server mode or OLTP systems. At the same time, it is compatible with various mainstream database systems on the market and OLTP Software, such as Oracle, SYBASE, Informix and Tuxedo. Latch ha also provides various application interfaces. Therefore, the customer can integrate various functions in their private software to ensure the high reliability of the system, which also protects the customer's investment.

System Structure of the latch ha solution: two hosts, A and B, share A disk array, A, and B, respectively. They are connected by a heartbeat line, known as "Heartbeat detection", mainly through a RS232 detection link. Latch ha also uses network ping detection to verify the accuracy of system downtime detection. The HA software installed on the host monitors the running status of the other Party in real time through the heartbeat line, once the active host A suffers A system fault due to various hardware faults, such as power failure, failure of the main component, or failure of the boot disk, host B is immediately put into work. Latch ha implements the "high-reliability shared storage" architecture. The architecture consists of two or three Redundant servers, one shared redundant disk array, one optional DBMS, and latch ha system software. Under the Protection of latch ha, enterprise computer systems can provide uninterrupted information services to avoid downtime caused by hardware faults or routine maintenance, therefore, we can first achieve optimal reliability and minimize downtime.

Detection of shared storage device faults latch ha can identify shared storage device faults caused by the following reasons: failure of SCSI adapter, failure of SCSI connection, or failure of RAID Controller. Shared storage device faults can also lead to misoperations or even system downtime of software accessing these devices. Network failure detection latch ha can identify network connection faults caused by the following reasons:

1. The network adapter is invalid or the network connection is invalid. These faults will make all network-dependent operations impossible. Process Termination check latch ha can detect whether the software process Exits normally. This means that different actions can be taken as a process ends. Adjustable detection timeout settings the system downtime detection and network detection timeout settings can be adjusted. Shorter timeout settings mean faster Fault Detection and server switching. However, this may lead to a reduction in the reliability of detection.

2. The server switching mode is automatic or manual. Generally, latch ha automatically detects system faults and transfers the service from an Invalid server to a backup server. Of course, the administrator can also manually switch to the backup server for some routine maintenance work. Once the failed server is restored, you can switch the service to the original computer. This feature can also be automatically completed.