mcec outage

http://blog.csdn.net/chychc/article/details/8313458Ecos Interrupt Model (1) ISR and DSREnglish full name Interrupt Service RoutineInterrupt handling is an important part of the real-time operating system. It is important to deal with interrupt sources in a timely manner, but some actions that must be considered atomic operations (which cannot be interrupted) have a very serious effect on timeliness. Because these actions are performed, disable interrupts are required. To minimize this action, en

genie from a group of smog. The genie said, "I usually give each person three wishes, so I will give each person one ." "First! First !" The clerk said, "I'm going to the Bahamas, driving a yacht, and enjoying myself! She disappears. Then, "change me! Change me !" The business representative said, "I am going to lie on the beach with my masseuse in Hawaii, and I still have pina coladas (Phoenix coconut juice) and my love for life ." Success! He disappears. "Now you are ready ." The geni

Today I saw a very good story. I don't know who wrote it. The following is an excerpt: There is a brother who lives on the 80 th floor. One day they went home on a trip and found the building had a power outage! Although they carry large bags of luggage, there seems to be no other choice, so my brother said to his brother, we will climb the stairs! As a result, they carry two bags of luggage and began to climb the stairs. When they climbed to the 20t

heat? No matter what, I came to the stairwell and started to call the landlord to harass the landlord, I finally found out where the insurance was, but I had no fuses to change. I wanted to change it, and I didn't think I could replace any wires (don't blame me, I was moving in too soon ). The heart is arrogant. It's just one night. Let's stay till tomorrow... Back in the room, I found that Master Biti and mm had no response, so I had to rush back to the room, the bed was too hot, so I ran to t

interesting, creating a game character is like creating a character object, to get a weapon is like creating a weapon object, encounter monsters, NPCs and so on are objects.And then with the knowledge of the analysis, we found that the object of data are stored in memory, we should all know that the memory of the data will disappear after the power outage, but our game after the archive, even if you shut down for a few days, and then into the game, r

layer is very special, the data server is stored data, in order to ensure that the server downtime data is not lost,The data Access service is non-disruptive and requires synchronous data replication during data writing, and data is written to multiple servers for redundant data backups.When the data server goes down, the application switches the access to the server that has the backup data.The frequency of site upgrades is generally very high, large sites released once a week, small sites rel

, fortunately it is not really take a knife hard disk cutting into several pieces, partition is the concept of virtual.Suppose we divide the hard disk into half-partitioned, 50% to linux,50% to Windows, then the hard disk case is as follows:In this way, the two operating systems can coexist peacefully. File systemIn each partition, the files are stored and organized in a certain way, which we call the file system.Users can use the file system to save data without having to worry about how

in the Redis configuration file, and you can set the rules at Redis runtime with Redis's config set command, without having to restart Redis.The Redis Rdb file does not break because its write operation is performed in a new process, and when a new Rdb file is generated, the Redis-generated subprocess writes the data to a temporary file and then renames the temporary file to an Rdb file by means of an atomic rename system call. In this way, Redis's RDB files are always available whenever a fail

generation to the Redis outage was lost. In some businesses, this is tolerable.2) aof logThe full name of the AOF log is append only file, which is an append-write log file. Unlike the binlog of a general database, the AoF file is a plain, recognizable text, and its content is a Redis standard command. Only those commands that cause data changes will be appended to the AoF file. Each command that modifies the data generates a log, and the aof file be

Rdb file generation to the Redis outage was lost. In some businesses, this is tolerable.2) aof logThe full name of the AOF log is append only file, which is an append-write log file. Unlike the binlog of a general database, the AoF file is a plain, recognizable text, and its content is a Redis standard command. Only those commands that cause data changes will be appended to the AoF file. Each command that modifies the data generates a log, and the ao

:Telnet 192.168.11.68 11211192.168.11.68 ... 192.168.11.68.Escape character is ' ^] '. 0end0 222end0 3333end0 44444End 0 555555ENDquitconnection closed by foreign host.Stop 52 of the memcached process and get Key1 to Key5 by Magent on 51:Kill ' cat/var/run/memcached/memcached.pid 'Telnet 192.168.11.51 11200192.168.11.51 ... 192.168.11.51.Escape character is ' ^] '. 0end0 222end0 3333end0 44444End 0 555555ENDquitconnection closed by foreign host.Recover 52 of the memcached process, through

customers, which is the most discussed content. Downtime is generally divided into two categories, planned downtime and unplanned downtime. A planned outage is a planned outage of a node or system, typically occurring in the case of Oracle upgrades, system maintenance, or hardware maintenance. 　　Unplanned outages are sudden outages in non-human-planned situations, which typically occur when Oracle bugs, sy

detailed design of the Redis cluster is described in the Redis cluster specification. This tutorial describes the availability and consistency of redis clusters in an easy-to-understand way, at the perspective of the Redis consumer. Note: This tutorial requires a version of Redis3.0 or more. If you plan to deploy a Redis cluster, you can read some detailed design of the cluster, which is not required, of course. Getting started with this tutorial, it's a good idea to start with a Redis cl

system. The second line of Used+free is the total of the first row.Expand reading:ROMRead only memory abbreviation, Chinese name is Read Only .In the case of a power outage, the data is not lost and is typically used to store fixed software and information. For example, the BIOS on the motherboard is ROM.RAMThe abbreviation for random Access memory, the Chinese name is the memory of RAM, short Read and write memory .In the case of a power

1 overviewIn order to guarantee the stable operation of the bastion host-instruction channel, it is necessary to implement the load balance of instruction channel, and study to determine the use of LVS software.LVS is the abbreviation for Linux virtual server, that is, the Linux server, the official site is: www.linuxvirtualserver.org2 LVS ArchitectureLVS set up server cluster to achieve load balancing has three components: the most front-end is the load balancer layer, with load balancer, the m

First, fault descriptionThe server is a Dell 730 series server, storage array is the MD3200 series Storage 5T LUN, the operating system is Linux CentOS 7, the file system type is EXT4, due to accidental power loss, the system does not start normally, after repair, the system can start normally, But the mounted 5T partition does not have normal access, the 5T partition for the fsck repair, the repair is completed after the file system is normal, but lost some files, carefully review the missing p

First, fault descriptionThe server is a Dell 730 series server, storage array is the MD3200 series Storage 5T LUN, the operating system is Linux CentOS 7, the file system type is EXT4, due to accidental power loss, the system does not start normally, after repair, the system can start normally, But the mounted 5T partition does not have normal access, the 5T partition for the fsck repair, the repair is completed after the file system is normal, but lost some files, carefully review the missing p

(hard link), a file can have a different path (soft link). The contents of the file cannot be stored on the same disk.In-memory space is divided into page blocks, which are typically 4K in size (different for different CPUs) Note: Disk occupies space and file actual size　　Ext2 differs from ext3: ext3 is a log file system. The log is the third independent region (data area, metadata area) of the disk partition. The inode is created in the log area, not the metadata area. After creating the Inode

1, RabbitMQ and Ptyhon process queue difference. Process Queue Primary User Python parent-child processes or a unified process with different sub-processes. Rabbit can communicate with each other before different languages, the socket can achieve the same function, but more complex.2, RabbitMQ message rotation. A producer for multiple consumer times. Messages are automatically rotation to different consumers.# Author:xiajinqiimport Pikaconnetction= Pika. Blockingconnection (Pika. Connectionparam

is executing on the CPU, different from saving the scene at the time of the outage, and in the same process context before and after the outage. Just from the user state to the kernel state execution; The process context contains all the information required by the process execution User address space: Includes program code, data, user stack, etc. Control information: Process descript