Metadata Storage

1, metadata (Metadata): Maintenance of HDFs file System file and directory information, divided into memory metadata and metadata file two kinds. Namenode maintains the entire metadata. HDFs implementation, the method of periodically exporting metadata is not adopted, but the backup mechanism of metadata mirroring file (fsimage) + day file (edits) is adopted. 2, Block: The contents of the file. Search path Flow: &http://www.aliyun.com/zixun/aggregation/37 ...

The storage system is the core infrastructure of the IT environment in the data center, and it is the final carrier of data access. Storage in cloud computing, virtualization, large data and other related technologies have undergone a huge change, block storage, file storage, object storage support for a variety of data types of reading; Centralized storage is no longer the mainstream storage architecture of data center, storage access of massive data, need extensibility, 　　Highly scalable distributed storage architecture. In the new IT development process, data center construction has entered the era of cloud computing, enterprise IT storage environment can not be simple ...

Research on QoS guarantee mechanism of multilevel metadata in cloud storage Zhiyong Lichunlin in the master-slave architecture of the cloud storage system, all data access needs to go through the metadata server, in the event of a surge in access, the metadata server may become a system bottleneck. Most of the current cloud storage systems employ FIFO scheduling strategies, when the service is congested, the service quality cannot be guaranteed, in order to ensure the quality of service, this paper makes the QoS distinction by the Congestion Admission control and the queue scheduling technology, which is based on the priority, restricts the access request of the low priority to enter the service queue, and avoids ...

Cloud storage is a concept that extends and develops in the concept of cloud computing (Cloud Computing). Its goal is to combine application software with storage devices to transform storage devices into storage services through application software. In short, cloud storage is not storage, it's a service. This service can provide virtual storage on demand on the network, also known as data storage as a service (Storage, DaaS). The customer pays for the storage capacity that is actually required to purchase. Any reference to the amount of fixed capacity added ...

(i): Market Overview China's cloud storage market dynamics China's current corporate cio/cto is sceptical about the public cloud, at present, about 70% of enterprises are unwilling to put the data in the enterprise on the public cloud, mainly from the security point of view, but the data for the enterprise business investment more and more,     Will force enterprises, especially for data security is very high financial industry also gradually towards the public cloud. Domestic ...

In recent years, with the rapid growth of mass video information, traditional security technology is more and more difficult to meet the needs of some industries in transmission, storage and large data calculation and analysis, or it is difficult to meet these needs with lower cost, more flexible extensibility, more robust, more reliable and more secure system architecture. Therefore, the concept of cloud computing in the two years began more and more infiltration into the field of security. The breakthrough application of cloud storage is particularly noticeable. 　　This article will mainly on the application of cloud storage in the field of security analysis. The popularization of network technology makes the network sharing of video resources become ...

In recent years, with the rapid growth of mass video information, traditional security technology is more and more difficult to meet the needs of some industries in transmission, storage and large data calculation and analysis, or it is difficult to meet these needs with lower cost, more flexible extensibility, more robust, more reliable and more secure system architecture. Therefore, the concept of cloud computing in the two years began more and more infiltration into the field of security. The breakthrough application of cloud storage is particularly noticeable. 　　This article will mainly on the application of cloud storage in the field of security analysis. The popularization of network technology makes video resources ...

Storage Domain International Authority SNIa (Storage Network Industry Association) gives the definition of storage virtualization (Storagevirtualization): "By abstracting, hiding, or isolating the internal functions of the storage System/subsystem from applications, compute servers, network resources, Implement storage and data management independent of applications and networks. Storage virtualization technology is to abstract the underlying storage devices unified management, to the server layer to mask the specificity of storage device hardware, but only to retain their unified logic ...

The previous article is about the table storage of Azure Service, this article is mainly aimed at the other kind of special storage-binary in azure, such as unstructured storage, if our Azure services need to save non-traditional or structured data, such as pictures, audio and video media, etc. Then we need to use the BLOB storage. 　　The Windows Azure platform provides a good hosting platform and programming model. Blob storage differs from Azure table storage in terms of concept, before we see table storage being the heaviest ...

The rapid expansion of enterprise data, the challenges of massive storage is becoming more severe. For users in a wide range of industries, explosive growth of massive amounts of data is flooding their storage systems. At the same time, the data security requirements of various industries are increasingly high. 　　In particular, video surveillance, High-performance computing and other industries, not only the storage system capacity, reliability requirements are increasing, but also for the transmission bandwidth has put forward higher requirements. In the face of growing data, traditional storage architectures, due to poor scalability, can only add high-end storage devices when user capacity and performance requirements increase. In the same ...