The so-called NearStore is a concept proposed with the refinement of customers' storage environment. The so-called NearStore has a relatively wide extension and is mainly targeted at customers Online storage and offline storage Application between. It refers to storing data that is not frequently used or has a small amount of data access on a storage device with low performance. But at the same time, the requirements for these devices are fast addressing and high transmission rate. (For example, the archiving of some infrequently used files saved for a long time by customers). Therefore, near line storage has relatively low performance requirements, but requires relatively good access performance. At the same time, in most cases, the infrequent data accounts for a large proportion of the total data, which requires the near line storage device to have a relatively large capacity. Traditionally defined near line storage devices in the industry are mainly DVD-RAM Optical tower and Jukebox Equipment. However, with the continuous development of storage devices, we will also consider low-end disk array (e.g. DS4100) or high-end tape devices (e.g. 3592) as near line storage application devices. There are three main types of near line storage devices: disk, tape, and optical. Disks include 3.5-inch and various removable materials, such as Iomega Zip disk and Syquest disk. There are countless kinds of tapes. There are recordable CDs (CD-R), erasable CDs (CD-RW), and digital universal erasable discs (DVD).
Nearline storage provides cheap, reliable and unlimited data backup and can reduce access to integrated online storage. For individuals and small businesses, if users can tolerate some time delays in storing or retrieving data, it will be an ideal solution. The near line storage media will not be infected by viruses when they are on the shelf, because the media at this time are not physically connected to the network, computer, server and Internet. When the near line storage medium is used to cover the device, it can prevent infection through write protection. If an infected computer is used to write data to and from the near line storage media, the media may be infected. Therefore, it is recommended that you scan the near line storage media with an anti-virus software program before use.
The advantages of online storage are near zero access latency, support for a large number of users to access, and easy centralized management. [1]
Nearline， With its standard storage interface, data transmission can be started within 3 seconds. This makes a huge difference in how quickly data can be restored to online status in disaster recovery, and also makes the recovery of a single file or directory more attractive and interactive.
In addition, Nearline's multi site redundant storage provides Data integrity And disaster protection, and use the same interface as other storage services. Nearline provides a bandwidth speed of 4M/s per terabyte of storage, and the speed will increase with the growth of storage capacity. Although this may become a major concern for small enterprises to choose Nearline, medium-sized and large enterprises have large capacity archives, so they are not so worried about bandwidth. [2]
