Модель надежности хранения информации на современных библиотеках оптических дисков, объединенных в массивы RAID-6

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А.В. Чернышов
74 ISSN 0236-3933. Вестник МГТУ им. Н.Э. Баумана. Сер. Приборостроение. 2017. № 3
Abstract Keywords
The article focuses on the problem of ensuring the reliability
of long-term storage of archival information on robotic
libraries, optical disks when these drives are combined in
RAID-6. The study proposes the following organization of
the disk memory, in particular for Panasonic in its modern
library of optical discs LB-DH8. In the library the infor-
mation is stored on a cartridge, each containing 12 optical
disks that can be configured for RAID-6. We built a mathe-
matical model of reliability of information storage on optical
disks for RAID-6 with a different number of disks. We
propose an acceptability criterion for probability value of loss
of information stored in the library, and the probability of
information loss in the library should not exceed the proba-
bility of failure of one optical disk. For example, calculations
for robotic library Panasonic LB-DH8 show that to ensure
the reliability of long-term storage of information, simple
combination of disks in RAID-6 is not enough. It is neces-
sary to create backup copies of information, their number
being determined by reliability indices specified in design of
information repository
Robotic library of optical discs, long-
term storage, optical storage media,
reliability of information storage,
RAID-6
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