Network Block Device Protocol

Blackhole is a data replication network block device that also supports mirroring, snapshots, and supports the use of the same data to store multiple LUNs. The file system is unpredictable and has been tested on Ext2/3/4,ntfs,reiserfs and Oracle clustered file systems (OCFS2). It supports encryption, compression, and multiple storage backend. The hash scheme used is user configurable. Programs exported to NBD devices can be installed on Linux and Gnu/hurd. Blackhole 2.1 This version is added to the Telnet interface ...

1. The introduction of the Hadoop Distributed File System (HDFS) is a distributed file system designed to be used on common hardware devices. It has many similarities to existing distributed file systems, but it is quite different from these file systems. HDFS is highly fault-tolerant and is designed to be deployed on inexpensive hardware. HDFS provides high throughput for application data and applies to large dataset applications. HDFs opens up some POSIX-required interfaces that allow streaming access to file system data. HDFS was originally for AP ...

Original: http://hadoop.apache.org/core/docs/current/hdfs_design.html Introduction Hadoop Distributed File System (HDFS) is designed to be suitable for running in general hardware (commodity hardware) on the Distributed File system. It has a lot in common with existing Distributed file systems. At the same time, it is obvious that it differs from other distributed file systems. HDFs is a highly fault tolerant system suitable for deployment in cheap ...

As a new computing model, cloud computing is still in its early stage of development. Many different sizes and types of providers provide their own cloud-based application services. This paper introduces three typical cloud computing implementations, such as Amazon, Google and IBM, to analyze the specific technology behind "cloud computing", to analyze the current cloud computing platform construction method and the application construction way. Chen Zheng People's Republic of Tsinghua University 1:google cloud computing platform and application Google's cloud computing technology is actually for go ...

-----------------------20080827-------------------insight into Hadoop http://www.blogjava.net/killme2008/archive/2008/06 /05/206043.html first, premise and design goal 1, hardware error is the normal, rather than exceptional conditions, HDFs may be composed of hundreds of servers, any one component may have been invalidated, so error detection ...

Refer to Hadoop_hdfs system dual-machine hot standby scheme. PDF, after the test has been added to the two-machine hot backup scheme for Hadoopnamenode 1, foreword currently hadoop-0.20.2 does not provide a backup of name node, just provides a secondary node, although it is somewhat able to guarantee a backup of name node, when the machine where name node resides ...

The switch occupies an important position in the enterprise network, which is usually the core of the whole network. In this era of hacker intrusion and virus-ridden network, as the core of the switch is also taken for granted a part of the responsibility of network security. Therefore, the switch must have the professional security product performance, the security has become the network construction must consider the heavy middle. As a result of security switches, the integration of security certification in the switch, ACLs (Access control list), firewall, intrusion detection and even anti-virus functions, the security of the network really need ...

For small and medium-sized enterprises, there are many free and open source router and firewall solutions, even as a business choice. 　　Many of these products offer LAN services, such as VPN services, hotspot gateways, and the use of mandatory network portals to share wireless networks. Here, the editors find open source and free router projects that are suitable for businesses that include small businesses, midsize, and even the size of Cisco and Juniper.  Gossip Less, we look at these seven open source and free Linux network operating system. &nb ...

With the advent of the HD era, the ancient storage mode has been unable to meet the needs of high-definition, more and more enterprise customers video communications demand for explosive growth, coupled with the strong promotion of equipment manufacturers, video surveillance will be used in the field of cloud storage this topic became hot. 　　The new generation of information technology, represented by cloud computing, Internet of Things and mobile interconnection, has become a strategic emerging industry and will be supported and developed by the State in the 35 period. In the 2010 China International Social Security Products Expo, facing the growing demand for security storage, as the leading domestic ...

The Ip_security Protocol (IPSEC) is a protocol recommended by the Internet Engineering Task Force (IETF) for IP security. VPN can be realized by the corresponding tunneling technology. There are two modes of IPSec: Tunnel mode and transport mode.    &http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; The IPSec protocol group also includes support for the network layer ...