LTO tape technology continues to evolve with LTO 5

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1 with LTO 5

2 Despite the predictions from industry experts, tape isn t dead yet and it continues to serve as a low-cost option for long-term storage for many organizations. Like all data center technologies tape. And with the latest release of LTO-5, organizations are able to trim storage costs even further. Read this SearchStorage.com E- Guide, as data backup expert, W. Curtis Preston, Discusses LTO-5 tape and its role going forward. Preston outlines how LTO tape differs from other tape media, discusses the various generations of LTO tape, and the pros and cons of LTO. LTO-5 tape is slated to be released later this year, with nearly double the capacity of its predecessor LTO-4. W. Curtis Preston, TechTarget executive editor and independent backup expert, outlines how LTO tape differs from other tape media, discusses the various generations of LTO tape, and the pros and cons of LTO in this Q&A. How does differ from other tape media? When Ultrium LTO tape backup technology first came out, the big difference from other types of tape was the LTO Consortium. So, a group of companies came together and agreed on a standard. That allows them to compete in the marketplace without hurting consumers. So you get the good aspects of competition -- tape gets faster, price gets lower, quality gets better -- without having to worry about problems related to interoperability. So, you can buy an LTO tape from any of the vendors associated with the LTO Consortium and it will work with products from any of the other vendors that are a part of the consortium. That's the biggest difference. LTO tape is linear, so the recording head is stationary and the tape moves very quickly across the head. The stripes of data are written in a line from the beginning of the tape to the end. Page 2 of 8

3 What are the pros and cons of? The biggest benefit is that LTO tape is ubiquitous. It's very common, every company supports it, all the operating systems support it, etc. The price is also a selling point. It's inexpensive and reliable. It outsells every other drive type in the midrange open-systems market by a significant margin. Another benefit for data archiving is the write once, read many (WORM) technology that was introduced in LTO-3. This feature ensures data integrity for longterm data retention. The disadvantages of LTO tape are similar or the same as other linear tape technologies. Because the tape moves at such a fast rate, there are dozens of feet of this tape passing the head per second. The problem with this is known as shoe shining. Shoe shining happens when you send data to the tape at a rate that is significantly slower than the rate that the tape is expecting. Tape has to write at a certain rate to get a good signal-to-noise ratio. If a tape is designed to run at 120 MBps, that's the speed it wants to go. When you send something like 20 MBps, it cannot go that slow. So, it speeds up to 120 MBps, writes the data, and then looks to the buffer which is now empty because you aren't supplying the right amount of data. Then, the drive stops and rewinds dozens of feet of tape across the write head. This back and forth shoe shining motion of the tape across the head wears out the tape while you decrease the throughput of the tape. Your 20 MBps turns into 10 MBps, because the drive isn't writing data when it is shoe shining. However, stepping technology has been introduced, which allows drives to step down in speed to compensate. LTO-3 and LTO-4 tape drives can step down to 25 MBps plus compression. What are the main differences between LTO 3 and LTO 4? Speed and capacity are the main differences between each generation. There is more and more data out there, so customers are looking for more and more capacity. The capacity of LTO-3 is 400 GB and it was increased to 800 GB for LTO-4 and there was a similar increase in speed from 80 MBps Page 3 of 8

4 to 120 MBps. Those were the main differences for any generation of LTO and its predecessor. However, LTO-4 introduced something very different, with drive-level encryption of backup data. Using a chip that works very much like the compression chip, LTO-4 users can encrypt data inline at line speed. LTO-5 is slated to be released later this year. What are the differences between LTO-5 and LTO-4? The main differences are going to be speed and capacity again. There is almost a doubling of capacity from 800 GB in LTO-4 to 1.5 TB native capacity for LTO-5. Interestingly, the data transfer rate only goes from 120 MBps to 140 MBps. Historically tapes have gotten faster as the electronic process for writing to tapes is refined. The tape doesn't get any bigger but more data can be written to the tape because the bits are stored closer to each other. When you store the bits closer together the tape gets faster by default. It's interesting that the capacity almost doubles with LTO-5 but the speed only increases by 10%. I think that's a good signal from the LTO Consortium that they understand that tape users need bigger and bigger tapes, but that they don't need faster and faster tapes. I applaud them for not doubling the speed from LTO-4. The faster the drive gets, the harder it is to stream data to the drive at the appropriate rate. Do you think users need this additional capacity now and will upgrade to LTO-5? It's all about the capacity. It's no secret that the world is more and more interested in disk and less and less interested in tape. However, there is still a huge market for tape for backup as well as for data archiving. Some people haven't been bitten by the data deduplication bug. Some have done the math and found that tape is still cheaper, even after deduplication. We have to deal with encryption, but the tape drives have native encryption now. There are many people that are not enamored with disk backup or they don't need it, so there is still a significant market for tape for backup and especially Page 4 of 8

5 archiving. There is no other medium that offers what tape does for archiving. The only real competition is optical, and the significant difference in price is such that most people don't even consider it. I think that, because users will always want to store more data in the same footprint, you will see users continuing to upgrade their tape infrastructure. Maybe not as many people as there might be if there was no disk backup and data deduplication, but still a significant number. enterprise tape library Spectra Logic Corporation today released the ExaScale T-Finity enterprise tape library; a high capacity storage system the company said is capable of storing more than 3.6 exabytes of data with up to 400,000 tape slots. Spectra also introduced new management software and features that the company said will increase performance and the useful lifespan of tapes. Spectra s ExaScale T-Finity tape library supports LTO and IBM TS1140 tape drives. A new T-Finity complex can scale to eight libraries, with each library holding up to 40 frames. A fully loaded complex with 400,000 slots could hold 1.2 exabytes with LTO-5 drives (2:1 compression) and 3.6 exabytes with TS1140 drives (3:1 compression). Spectra said its new library scales beyond libraries from enterprise tape library market leaders Oracle and IBM. Oracle s StorageTek SL8500 Modular Library System holds 100,000 slots and 1 exabyte with LTO drives, and the IBM TS3500 has 300,000 slots for 2.7 exabytes with TS1140 drives and 900 PB for LTO drives. Spectra also released Version 12 of its BlueScale management software, adding faster barcode scanning, enhanced motion codes, SSL web certificates and an XML Open Library API so customers can develop software apps for improved tape management. The vendor claims the faster Page 5 of 8

6 barcode scanning and motion code enhancements will significantly speed robotic performance for its enterprise and midrange tape libraries. BlueScale 12 is available on all Spectra T-Series tape libraries and is a free upgrade for current customers. Other Spectra enhancements include a Carbide Clean pre-cleaning media process and Bulk TeraPack Access Port (TAP) system for importing and exporting tapes faster. Carbide Clear cleans tapes before they are shipped, which the vendor claims extends the life of the media. According to Molly Rector, Spectra s chief marketing officer, new tapes accumulate debris during the manufacturing process, which can cause excessive wear on drive heads and reduce their life span. By adding the mechanical cleaning process with a carbide blade, Rector said Spectra can double the useful life of a tape from 800 hours to 1,600 hours. When you get hundreds of thousands of tapes, this becomes very important, Rector said. Bulk TAP is an optional feature on Spectra s T950 and T-Finity enterprise tape libraries that allows administrators to import and export up to 140 tapes at a time, or up to 500 TB of data. According to Enterprise Strategy Group senior analyst Mark Peters, Spectra Logic s tape and management enhancements are part of the company s efforts to convince administrators that tape remains relevant and useful for storage. Tape is perceived badly because over the decades that we ve been using it, it s typically been unreliable because it s uncertain that you ll be able to read what s there, Peters said. It s also been very hard to find what s where. He said that rightly or wrongly, disk is perceived to be much more reliable than tape. Page 6 of 8

7 Peters mentioned that he is specifically interested in the BluScale Version 12 update because it includes the XML API, which organizations can use to develop customized searching capabilities. Peters said improved search is a key for the continued use of tape storage. Administrators want more certainty that data stored on tape will be where the system says it is and it will be readable, he said. Page 7 of 8

8 Free resources for technology professionals TechTarget publishes targeted technology media that address your need for information and resources for researching products, developing strategy and making cost-effective purchase decisions. Our network of technology-specific Web sites gives you access to industry experts, independent content and analysis and the Web s largest library of vendor-provided white papers, webcasts, podcasts, videos, virtual trade shows, research reports and more drawing on the rich R&D resources of technology providers to address market trends, challenges and solutions. Our live events and virtual seminars give you access to vendor neutral, expert commentary and advice on the issues and challenges you face daily. Our social community IT Knowledge Exchange allows you to share real world information in real time with peers and experts. What makes TechTarget unique? TechTarget is squarely focused on the enterprise IT space. Our team of editors and network of industry experts provide the richest, most relevant content to IT professionals and management. We leverage the immediacy of the Web, the networking and face-to-face opportunities of events and virtual events, and the ability to interact with peers all to create compelling and actionable information for enterprise IT professionals across all industries and markets. Related TechTarget Websites Page 8 of 8

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