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has dropped to a relatively low, this time may be to the next bottleneck, look at the Windows performance counters found a large number of blocking requests, so you can do the Web garden or add some webserver server. In this process of adding webserver servers, there are several issues that may occur:The soft load of an Nginx server can no longer afford a huge amount of web traffic, and it is possible to solve F5 or applications logically by using hardware load, and then spread to different sof

Create soft RAID 1 under CentOS6.5What is RAID? RAID, Redundant Array of Independent Disks, formerly known as Redundant Array of Inexpensive Disks, is short for hard disk arrays. The basic idea is to combine multiple relatively inexpensive hard disks into a hard disk array group, so that the performance can reach or even exceed a hard disk with a high price and huge capacity. Depending on the selected versi

dealing with asynchronous events such as asynchronous IO. The use of kernel threads is inexpensive, and the only resource used is the space for storing registers when the kernel stack and context switches. Multithreading-enabled cores are called multithreaded cores (multi-threads kernel). Lightweight process [*] lightweight thread (LWP) is a user thread supported by the kernel. It is a high-level abstraction based on kernel threads, so you can have a

(1) RAID introduction: Redundant Arrays of independent disks (RAID, RedundantArrayofIndependentDisks), formerly known as Redundant Arrays of cheap disks (RAID, RedundantArrayofInexpensiveDisks), or hard disk arrays. The basic idea is to put multiple relative... (1) RAID introduction: Redundant Array of Independent Disks (RAID, Redundant Array of Independent Disks), formerly known as Redundant Array of cheap Disks (RAID, Redundant Array of Inexpensive

and find an architecture design approach, preferably using inexpensive, ordinary small box devices to build a very large network.This approach peaked at the research of several professors represented by Mohammad Al-fares, Department of Computer Science and engineering at the University of California, USA.In their paper "A Scalable, commodity Data Center Network Architecture" published in Sigcomm in 2008, a three-level Fattree network architecture cal

bandwidth and the buffer management which the cloud computing does not have, and finally, because the focus of cloud computing is not on the terminal's usage, it has no breakthrough in terminal security And transparent computing has good consideration in terminal security.Thus, the basic view of Zhang Yao is that cloud computing is a service that provides computing resources through a server-side architecture, and that the user terminal exists only as the receiving end of the service, while tra

DirectoryChapter 1th Introduction1.1 Document Description1.2 Reference documentsThe 2nd chapter the concept and principle of erasure code2.1 Concepts2.2 Principle3rd Chapter Introduction of CEPH Erasure code3.1 Ceph Erasure code use3.2 Ceph Erasure code Library3.3 Ceph Erasure code data storage3.3.1 Encoding block reading and writing3.3.2 interrupted full write3.4 Scope of Use3.4.1 Cold Data3.4.2 inexpensive multi-data center storage4th chapter of Cep

A RAID definitionRAID (Redundant array of independent disk independent Redundant array) technology was proposed by the University of California, Berkeley, in 1987, initially to combine small, inexpensive disks in place of large expensive disks, while hoping that the disk will fail without damaging access to the data Development of a certain level of data protection technology. RAID is a redundant array of inexpens