dsi fault

Some CIOs know that fault-tolerant systems have higher reliability than clusters, but what ccios are embarrassed about is how to convince CEOs: A Fault-Tolerant server costs about more than 0.2 million yuan, and a cluster server costs about 20 thousand yuan, however, it is not easy to convince the CEO that the two servers cost more than 40 thousand yuan. From the perspective of ROI), the

Methods to Improve fault locating accuracy of optical fiber lines The continuous development of the economy is driving the constant upgrading of the information age. The transmission rate and capacity of copper cables cannot meet people's needs. Therefore, the optical cable market has ushered in unprecedented development. Nowadays, with the support of national policies, optical fiber cable lines are laid and used in large quantities, and technologies

Contents of this issue: Executor's Wal Message Replay Data security perspective to consider the entire spark streaming:1, Spark streaming will receive data sequentially and constantly generate jobs, continuous submission job to the cluster operation, the most important issue to receive data security2. Since spark streaming is based on Spark core, which means that there are errors or failures during the operation, spark streaming can also useThe ability to

One, Spark streaming data security considerations: Spark Streaming constantly receive data, and constantly generate jobs, and constantly submit jobs to the cluster to run. So this involves a very important problem with data security. Spark Streaming is based on the spark core, if you can ensure that the data is safe, when the spark streaming generated the job is based on the RDD, even if the problem occurs when running, then spark streaming can also use spark The core's

phenomena:(1) run the ping command on computer A2 (IP Address: 10.20.12.12/24) to ping the computers B1 and B2 in department B's network respectively. Then, it is found that B1 has a normal response, and the response rate of B2 is between 20% and 24 ~ In computer A3 (IP: 10.20.12.13/24), ping the computer B1 and B2 by using the ping command. The response shows that the connection is normal and the packet loss rate is 0.(2) Change the IP address of computer A3 to 10.20.12.12/24 before testing. T

This article is a summary of the Flink fault tolerance . Although there are some details that are not covered, the basic implementation points have been mentioned in this series.Reviewing this series, each article involves at least one point of knowledge. Let's sum it up in a minute.Recovery mechanism implementationThe objects in Flink that normally require state recovery are operator as well function . They are able to achieve state snapshots and sta

How to conduct MySQL database table fault detection you may encounter various unexpected damages to the database table when using MySQL, and the data is often the latest data, it is generally not possible to find the data in the backup. This chapter describes how to detect MySQL database table faults. The general process of fault detection and correction in the table is as follows: ◆ Check tables with erro

long_query_time is set to 3 seconds, while a simple query takes dozens of seconds, which is obviously problematic. Write the script and kill the related sessions. if it doesn't help you, there are still a lot of connections. In this case, use top to view the Server Status. the memory and CPU usage of mysqld processes remain high. Number of slow queries during a fault, Average CPU usage, Then, use show full processlist to check the complete status a

[MySQL fault] ERROR1045 (28000): Accessdeniedforuser bitsCN.com [MySQL fault] ERROR 1045 (28000): Access denied for user 'Mmm _ agent' @ 'exxx -tx.com '(using password: YES) 1 error login error [Python] [Uxxx @ exxx-0702 ~] $ Mysql -hexxx-tx.com -- user = 'Mmm _ agent' -- password = '# tx $' ERROR 1045 (28000): Access denied for user 'Mmm _ agent' @ 'exxx -tx.com '(using password: YES) 2. remove the-h p

View the oracle database table lock example mdash; fault locating 1. Open a session session1 (actually, establish a connection with the database, you can use third-party software View the oracle database table lock example mdash; fault locating 1. Open a session session1 (actually, establish a connection with the database, you can use third-party software View Oracle Database Table lock example-

Windows cache write failure Data cannot be saved for this file. This may be due to your network connection error or computer hardware. Please save the data separately. After it is closed, a dialog box similar to the files under system32 will pop up, as if many files are *. log files, the system cannot be started, but the fault disappears after the memory is replugged. Fault Analysis Windows uses a special s

. Generally, viruses are detected. Of course, another possibility is that when you access the Internet, someone maliciously intrude into your computer and place Trojans. In this way, the other party can remotely control all activities on your computer, including restarting your computer. It is not easy to clear some Trojans. It is best to reinstall the operating system. 2. System File Corruption When system files are damaged, such as KERNEL32.DLL under Win2K, font under Win98 FONTS, and other ba

Determine NFS Problems Like other network services, problems may occur when using the Network File System NFS server. Troubleshooting of these problems involves understanding how to track NFS problems, identifying NFS-related error messages, and selecting appropriate solutions. When you track an NFS server problem, isolate the three main fault points to determine which one does not work: the server, client, or network itself. Identify problems with ha

With the development of network technology, we should pay attention to the cracking of wireless network technology. What are the solutions for network cracking? Here is a detailed description. Wireless network technology has become the top priority of our technologies. How can we solve the thorny problems? Here we will summarize common wireless network faults. With the improvement of wireless network performance, more and more enterprises are using wireless networks as an effective supplement an

How to debugvip fault problems and troubleshooting VIP resources cannot start due to lack of gateway problems: ----- view node application resources statistics: u01crsbinsrvctlconfignodeapps-ndbtest2-a-g-s-lVIPexists.: dbtest2-vip10.11.11.198255.255.255.0eri0GSDex How to debug the vip fault and how to solve the problem that the VIP resource cannot be started due to the lack of Gateway: ----- view the node A

ORA-27090 fault case The recent alert Log encountered an error message for the ORA-27090 with the error prompt Unable to reserve kernel resources for asynchronous disk I/O. According to this prompt, It is a kernel parameter problem related to asynchronous I/O. The following describes and solves the problem. 1. Fault error information 2. Fault Analysis # View

Fault AnalysisA typical network loop fault uses protocol analysis tool Sniffer to capture so many data packets. After some analysis, I did not see the problem. Apparently, the first sight of a large number of SYN packets gave us the illusion that it was a SYN Flood attack. Afterwards, we reviewed the network loop troubleshooting process, re-analyzed the captured data packets carefully, and explained the fiv

line to configure the IP addresses of both 550FX servers, and then pinged from 550T! In my heart, the device is broken? As usual, this stack mode should be connected without configuration. This type of fault specification has not been mentioned. After being calmed down, I summarized and analyzed the following possibilities: 1. The six-port matrix stack module fails, resulting in connection failure.2.550T slot is faulty, and the six-port matrix Stacki

MySQL database table fault detection, the table's fault detection and correction process is as follows: ◆ Check tables with errors. If the table check is successful, the task is completed. Otherwise, the database table with errors must be repaired. ◆ Copy the table file before starting the restoration to ensure data security. ◆ Start restoring database tables. ◆ If the restoration fails, recover data from

, difficulty factor:★★★★★Beyond Compare picture comparison, support two different sizes to compare, click the "View" button, select the "Autoscale" tab in the expanded menu, that is, automatically enlarge the comparison of the two sides of the picture in the relatively small picture, matching the larger picture.Next we continue to find fault, from the red label can be very simple to see the picture differences:1, the right picture of the lower left co