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Big library for big data

According to analysts, approximately 40% of digital content is now stored on a magnetic tape and, although over time this proportion will gradually decrease due to competition from disk storage systems, nevertheless, by 2015 the amount of information stored on the tape will increase more than five times. Despite the reduction in the cost of storing disk systems, the tape remains a much more favorable carrier for long-term storage of electronic archives, so in the coming years we should not expect a rejection of the magnetic tape. Of course, if before the tape was a standard backup solution, now it is most often used for storing electronic archives, so the scalability of tape libraries comes to the fore.


In June, there was a change in the generation of HP StorageWorks Enterprise Storage Library (ESL) enterprise-class tape libraries. The first generation of StorageWorks ESL was released under the Compaq brand at the beginning of the last decade, then in 2004 HP introduced the current HP StorageWorks ESL E-Series model, which is now being replaced by HP StorageWorks ESL G3 (as the reader guessed, G3 means the third generation of libraries). These systems are designed primarily for data centers of large organizations where there is a storage network based on Fiber Channel, for example, in Russia, the HP StorageWorks ESL E-Series library uses a number of leading banks.

Compared to the HP StorageWorks ESL E-Series, the new library has improved scalability — it has a maximum configuration of 5,000 cartridges versus 3546 for its predecessor, and as a result, the HP StorageWorks ESL maximum capacity grew from ten to fifteen petabytes (using the LTO-5 Ultrium tape format 3280 and hardware compression 2: 1), and the maximum number of tape drives has more than doubled to 96. The maximum library performance has improved to 96 terabytes / hour. In addition, the lower price bracket has decreased - if the initial configuration of the HP StorageWorks ESL E-Series had 322 cartridge slots, then HP StorageWorks ESL G3 can be purchased in the initial configuration for 100 slots. Another important difference of the new library is the installation in standard 19-inch server racks instead of special racks for HP StorageWorks ESL E-Series, which simplifies its placement in the data center.

When storing large amounts of data, not only the capacity is important, but also the high reliability of the tape library. Each library rack (there may be 12 in total) can be equipped with a main and backup power source, switching to backup paths is provided in case of a failure in the data transfer path and commands, and early next year it is planned to ensure installation of a second robot in the library to protect against failures the main robot. Thanks to the new Automated Media Pool (AMP) mechanism inside the library, you can not only create logical partitions (virtual libraries), but also redistribute the drives and slots for cartridges between them (there can be up to 16 such sections in just one library).
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With its scalability and reliability, HP StorageWorks ESL G3 delivers cost-effective, long-term storage of large electronic archives.

Source: https://habr.com/ru/post/124374/


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