Method for Improving Information Storage Reliability in Long-Term Electronic Storage on Optical Disks Arrayed in RAID-6 by Mixing Backup Copy Disks

Authors: Chernyshov A.V. Published: 02.08.2017
Published in issue: #4(115)/2017  
DOI: 10.18698/0236-3933-2017-4-88-97

Category: Informatics, Computer Engineering and Control | Chapter: Computing Systems and their Elements  
Keywords: electronic archiving information storage, long-term storage, optical storage media, information storage reliability, RAID-6 array

The purpose of this study was to propose a method for ensuring high reliability of information storage in long-term electronic storage on optical disks arrayed in RAID-6 by mixing backup copy disks. We built a mathematical model of information storage reliability. The sample calculations for robotic library Panasonic LB-DH8 show that the method makes it possible to minimize the number of information backup copies ensuring the reliability targets specified when designing the information storage. The LB-DH8 library allows for combining in RAID-6 only the discs within one cartridge and we can obtain a spare copy of the cartridge on another cartridge. However, the exchange of individual disks between the cartridges in automatic mode is impossible. Therefore, for practical implementation of the method on the library LB-DH8 operator intervention is required to manually exchange the respective discs between the cartridges. We demonstrated the use of the model for calculating the maximum number of optical disks in RAID-6 to reduce the redundancy of the disks array.


[1] GOST R 54989-2012. Obespechenie dolgovremennoy sokhrannosti elektronnykh dokumentov [State standard R 54989-2012. Long-term preservation of electronic document-based information]. Moscow, Standartinform Publ., 2013. 23 p.

[2] ISO/TR 18492:2005. Long-term preservation of electronic document-based information. Available at: http://www.iso.org/iso/catalogue_detail.htm?csnumber=38716 (accessed 17.05.2016)

[3] Rossiyskie organizatsii nachinayut stroit’ elektronnye arkhivy na opticheskikh diskakh [Russian organizations are beginning to build electronic archives on optical discs]. Assotsiatsiya lektronnykh torgovykh ploshchadok: web-site. Available at: http://www.aetp.ru/market-news/item/400867 (accessed 13.11.2015)

[4] Chernyshov A.V. To the question of the optical discs application for long term digital archive storage of small organizations. Informatsionnye tekhnologii [Information Technologies], 2016, vol. 22, no. 8, pp. 635-640 (in Russ.).

[5] Data archiver LB-DM9 series. Panasonic: company web-site. Available at: http://panasonic.net/avc/archiver/lb-dm9/LB-DM9series-PE.pdf (accessed 27.09.2016)

[6] Data archiver LB-DH8 series. Panasonic: company web-site. Available at: http://panasonic.net/avc/archiver/lb-dh8 (accessed 01.02.2016)

[7] Robot-bibliotekar’ poselilsya v novomkampuse SPbGU "Mikhaylovskaya dacha" [Robot-librarian moved in new "Mikhaylovskaya dacha" campus of SPbU]. SPbGU: university web-site. Available at: http://spbu.ru/smi/o-nas-pishut/24726-robot-bibliotekar-poselilsya-v-novom-kampuse-spbgu-mikhajlovskaya-dacha.html (accessed 13.11.2015)

[8] Optical jukeboxes and libraries. Kintronics: company web-site. Available at: https://kintronics.com/solutions/optical-jukeboxes-and-libraries (accessed 14.05.2016)

[9] New Sony Everspan library system delivers reliable optical disc archiving for data centers. CDRinfo: company web-site. http://www.cdrinfo.com/Sections/News/Details.aspx?NewsId=45763 (accessed 14.05.2016)