What Is Online Digital Storage?

OffStore is used to back up data stored online to prevent possible data disasters, so it is also called backup-level storage. And mainly use optical disks or tape storage. With the development of archive informationization, the digital archive information held by archives at all levels in China has increased dramatically, and it continues to grow rapidly. The problem of security management of massive archives information has become an important issue for archives departments at all levels. As the national e-government progresses further, this problem will become more prominent.

Typical products for offline mass storage are tapes, compact discs (DVD \ BD) or

The massive archive data offline storage system is composed of hardware system and software system, supplemented by a series of operating procedures to achieve scientific and standardized offline hard disk storage of archive data. The system can change the management and application mode of device group opening and group closing in the traditional hard disk storage system, and can realize the on-demand conversion of the hard disk online and hibernation status in the storage system; while ensuring the low-power operation of the hard disk storage system, the archives are realized Data fast retrieval application; it can solve technical problems such as automatic regular detection of offline equipment, regular power-on maintenance, etc., and realize the protection of the hard disk storage system.

The functions of the massive archive data offline storage system mainly include: disk storage registration, check disk presence, check disk parameters, establish file directory structure, directory mount, establish data mirroring, file directory retrieval, hard disk out of the database, data utilization, view original text , Export data, print data, etc. The overall plan processes all functions and plans users into three types of roles:

Disk enclosure administrator. Mainly complete the work of disk storage, disk check, disk check, disk parameter check, and disk storage.

Data administrator. It mainly completes the establishment of file directory structure, directory mounting, and data mirroring.

Archivists. Can perform archive directory search, view original text, export data, print data, etc. ^[2]

The hard disk offline storage cabinet hardware system includes two parts of the cabinet hardware and the cabinet body. The hardware in the cabinet is mainly divided into four parts: hard disk array controller module, SATA bus exchange control module, local master control module and power module.

Each module independently completes specific functions. The modules are connected through control lines and buses to cooperate with each other to complete data transmission, system control and power supply control between hard disks. The hard disk offline storage cabinet mainly implements centralized management of hard disks. The cabinet has functions of dustproof, antimagnetic, waterproof, anti-theft, impact resistance, and resistance to high and low temperature changes. It can work at low voltage and is equipped with backup power supply batteries.

Software functions mainly include: rapid data migration, human-computer interaction, periodic hard disk self-check, status monitoring, regular power-on maintenance of hard disks, offline data management, and fast data utilization.

The achievements of the hardware equipment series are mainly two types of equipment: data migration equipment and hard disk offline storage cabinets. Through two types of equipment, functions such as archival data migration, offline storage and online retrieval of archival data, hard disk detection, and fault alarms can be realized.

(1) Mobile data migration equipment

Data migration equipment is designed to meet the needs of many units for backup of multiple sets of optical disks, hard disks and other carriers. The device can realize one-to-many data migration between hard disks, and can also realize one-to-many data migration from optical disks to hard disks, and can make optical disk images as required. According to the requirements of rapid data collection and backup, mobile data migration equipment and portable data migration equipment are designed.

(2) Offline hard disk storage cabinet

The research group has developed an offline hard disk cabinet with multiple hard disk storages, which solves the storage environment problems of offline hard disk storage and the problem of regular low-voltage charging. According to different application environments and different application requirements, the hard disk offline storage cabinets are designed into four types: office, cabinet, warehouse, and military disaster preparedness. Each hard disk offline storage cabinet has the characteristics of dustproof, anti-theft, anti-magnetic, and good heat dissipation, and is equipped with anti-theft door locks to prevent illegal opening of the cabinet door. Cascades between cabinets and multiple hard disks in a cabinet are realized. A single cabinet can provide hundreds of hard disk slots.

The software system mainly includes a data migration management system, a touch screen query system in the cabinet, and an offline hard disk storage management system. Three software systems support the migration of optical disc data, independent cabinet management, and control terminal management.

The software system can achieve complete control of offline hard disk data to prevent illegal reading, writing, and modification of hard disk data; real-time monitoring and visual display and alarming of the physical status of each hard disk; a complete set of early-warning mechanisms; and multiple hard disks and Cascading and management of multiple cabinets; backup and replication of early warning hard disks ^[3]

In order to standardize the use of offline hard disk storage systems for archival data, the research team formulated a system operating procedure, which specifies the technical requirements, inspection rules, security control, offline storage, online management, and application of offline hard disk storage.

Based on the research results, the research group drafted the archival industry standard "Specifications for Offline Storage Management of Archive Data Hard Disks" (draft), with a view to providing a standardized basis for the archival industry to apply offline hard disks for archival data backup. This standard has been reviewed and approved by the National Archives Standardization Technical Committee and included in the archives industry standard-setting plan ^[2]

The long-term safe preservation of massive archives information has become a common problem faced by archives departments. Archive departments in various places mostly use a combination of online backup, near-line backup and offline backup to store massive archive information. Each storage method has its own technical characteristics. Among them, the online storage method has many advantages such as timely data update and fast information query speed. However, its high purchase cost, high operation and maintenance costs, and massive online storage of all archival data require a large amount of data. Investment. Comprehensively considering the characteristics of archive data with high importance, high security requirements, and relatively low frequency of use, many archives have adopted a combination of online storage and offline storage storage strategies. Generally, high-frequency data will be used for online storage to facilitate quick query and utilization. Infrequent data will be used for near-line or offline storage to achieve long-term preservation goals.

The storage carriers selected by the archives department are mainly hard disks, magnetic tapes, and optical discs, and each storage carrier has its own technical advantages. As one of the main storage carriers, hard disks have been increasingly used in archival information storage and backup work. The hard disk has the advantages of fast data reading speed, rapid technological development, rapid reduction in unit storage cost year by year, and relatively large storage capacity of a single disk medium. The hard disk has a wide and stable application in the online storage of digital information. More and more archives are beginning to use hard disks as offline storage carriers for mass archive information storage. After practice, while the hard disk plays an important role in offline storage of archive information, due to the technical disadvantages of the hard disk itself, as well as improper storage and use, it has caused problems such as hard disk damage and data loss. Great danger.

The problem that affects the reliability of hard disks for offline storage is mainly reflected in the following aspects: Hard disks need to be powered on and started regularly to ensure their normal operation, and some archives store the hard disks offline in the archives directly because of conditions, which cannot be used for a long time. Power on; hard disk storage has higher requirements on environmental conditions such as temperature and humidity. Some archives store hard disks in the back room for a long time and cannot meet the environmental conditions required for hard disk storage; hard disks have weak shock and shock resistance, and hard disks When it is used for offsite backup, it must be moved and transported for many times, which will inevitably cause vibration. The hard disk data can be erased and easily modified. It must be able to prevent malicious modification when it is used to save file information. The capacity of a single hard disk is limited and used for mass files. When data is stored offline, for easy management, the problem of cascading multiple hard disks needs to be solved.

To solve the above problems, we need to carry out targeted research and provide multiple protection, detection, and management mechanisms for offline hard disks through scientific and effective technical means to compensate for the lack of technical characteristics of hard disks when they are used for offline storage and prevent The problem of data loss caused by hard disk damage provides technical support for the application of hard disks in the off-site backup of massive archive information, facilitates the effective management of offline data by archives departments, and enables digital archive information resources to be safely stored for a long time.

Improve the hard disk offline storage mode, develop hard disk offline storage cabinets, provide multiple protection and detection mechanisms for hard disks to change the lack of technical characteristics of hard disks as offline storage media, and support the offline storage of digital archive information. Data is effectively stored offline and managed offline. The research results will be able to provide archival departments with practical solutions for archival information storage. It is applicable to the offline storage of archival information in different regions and environments, and has good social and economic benefits.