{"id":2042,"date":"2014-07-13T15:54:16","date_gmt":"2014-07-13T14:54:16","guid":{"rendered":"http:\/\/www.data-protector.org\/wordpress\/?p=2042"},"modified":"2015-12-10T19:29:58","modified_gmt":"2015-12-10T18:29:58","slug":"physical-tape-vs-virtual-tape","status":"publish","type":"post","link":"https:\/\/www.data-protector.org\/wordpress\/2014\/07\/physical-tape-vs-virtual-tape\/","title":{"rendered":"Physical Tape vs. Virtual Tape"},"content":{"rendered":"<p>In a modern Backup &#038; Recovery infrastructure backup-to-disk solutions are used very often. But many customers need to look at capex and opex. With the implementation of modern deduplication technologies these expenses can be decreased very easily. However, to save money, you have to follow some rules, otherwise the backup-to-disk solution will not work as efficient as expected. The most important rules and a comparison of virtual and physical tape drives are listed below. More information and best practice tips can be found in &#8220;StoreOnce User Guides&#8221;.<\/p>\n<p><u>Basics:<\/u><\/p>\n<ul>\n<li>Physical and virtual tape principles are very different.<\/li>\n<li>Physical tape receives data that is optimized for a sequential data stream and writes the data in a serial format to a sequential target device.<\/li>\n<li>Virtual tape receives data in a random stream and to achieve top performance writes the data in a random format to a random access target device.<\/li>\n<li>Therefore the methods you must use to optimize these two are very different types of devices and must be very different to achieve best performance. The methods used for physical tape will not work for virtual tape.<\/li>\n<\/ul>\n<p><u>Optimize for physical tape:<\/u><\/p>\n<ul>\n<li>Multiplexing and a high concurrency (amount of clients writing to the same tape at the same time) are the best to increase the data transfer rate to the tape drive.<\/li>\n<li>A high concurrency and a good data transfer rate prevents the tape to start and stop, known as &#8220;Shoe-Shining&#8221;.<\/li>\n<\/ul>\n<p><u>Multiplexing:<\/u><br \/>\n<img src=\"https:\/\/www.data-protector.org\/wordpress\/wp-content\/uploads\/2014\/07\/multiplexing1.png\"\/>\n<\/p>\n<p><u>Optimize for virtual tape:<\/u><\/p>\n<ul>\n<li>For a good deduplication you must not use Multiplexing, so the concurrency must be set to &#8220;1&#8221; for the tape. Using these rules the data stream is optimized to recognize and remove redundancy in data stream (=deduplication).<\/li>\n<li>To increase the performance Multistreaming and as many virtual tape drives as needed must be used. As the tape is virtual you do need to worry about resources.<\/li>\n<\/ul>\n<p><u>Multistreaming:<\/u><br \/>\n<img src=\"https:\/\/www.data-protector.org\/wordpress\/wp-content\/uploads\/2014\/07\/multistreaming1.png\"\/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In a modern Backup &#038; Recovery infrastructure backup-to-disk solutions are used very often. But many customers need to look at capex and opex. With the implementation of modern deduplication technologies these expenses can be decreased very easily. However, to save money, you have to follow some rules, otherwise the backup-to-disk solution will not work as [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"spay_email":""},"categories":[1],"tags":[],"translation":{"provider":"WPGlobus","version":"2.8.8","language":"en","enabled_languages":["en","de"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"de":{"title":false,"content":true,"excerpt":false}}},"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p28cjj-wW","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":2395,"url":"https:\/\/www.data-protector.org\/wordpress\/2015\/09\/future-tape-technology\/","url_meta":{"origin":2042,"position":0},"title":"The future of the Tape Technology","date":"25. September 2015","format":false,"excerpt":"{:en} Many customers continue to rely on tape storage to protect their business critical applications and data. The benefit to continue performing classic backup is obvious: Tape storage is cheap compared with backup-to-disk technolgies. In a TCO consideration lower cost per GB and lower energy costs are speaking for an\u2026","rel":"","context":"In &quot;Common&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":87,"url":"https:\/\/www.data-protector.org\/wordpress\/2010\/12\/was-ist-eigentlich-device-polling\/","url_meta":{"origin":2042,"position":1},"title":"What is device polling","date":"31. December 2010","format":false,"excerpt":"{:de}Bestimmt jeder Data Protector Kunde mit einer Fibre Channel Tape Library hat dieses Problem schon mal wissentlich oder unwissentlich erlebt: ein SCSI Reset w\u00e4hrend einer Sicherung... und das ganze Band ist zerst\u00f6rt. Was war passiert? Das Bandlaufwerk wurde mit\u00a0SCSI Kommandos \u00fcbersch\u00fcttet - das nennt man auch Device Polling. Polling ist\u2026","rel":"","context":"In &quot;Common&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1819,"url":"https:\/\/www.data-protector.org\/wordpress\/2014\/01\/storeonce-success-story-australia\/","url_meta":{"origin":2042,"position":2},"title":"StoreOnce success story from Australia","date":"27. January 2014","format":false,"excerpt":"{:en}Recently I asked you to share your StoreOnce success story. Here is a awesome story and a good example for federated deduplication from a company in Australia. Before using HP StoreOnce, the company used to protect its data in the two datacentres using HP Data Protector. The data (FileSystems, MS\u2026","rel":"","context":"In &quot;SCD&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1328,"url":"https:\/\/www.data-protector.org\/wordpress\/2013\/04\/vmware-backup-nbd-san\/","url_meta":{"origin":2042,"position":3},"title":"VMware backup done over NBD instead of SAN","date":"11. April 2013","format":false,"excerpt":"{:en}Problem: The backup of some virtual machines is done using transport mode NBD instead of SAN, even if it is configured for the virtual machine or a vApp container. There might be other virtual machines on the same SAN disk, which are able to do the backup over SAN. The\u2026","rel":"","context":"In &quot;HowTo&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":549,"url":"https:\/\/www.data-protector.org\/wordpress\/2011\/07\/d2d-and-data-protector\/","url_meta":{"origin":2042,"position":4},"title":"D2D and Data Protector","date":"11. July 2011","format":false,"excerpt":"{:en}For a customer it could be interesting to enhance the backup and recovery strategy and to do the backup (or parts of the backup) to disk first and to copy the data to tape later. The main advantage is the reduced time it will take to recover a single file,\u00a0as\u2026","rel":"","context":"In &quot;HowTo&quot;","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3016,"url":"https:\/\/www.data-protector.org\/wordpress\/2016\/05\/prepare-and-execute-eadr-cell-server-on-windows-2012-r2-data-protector-9-06\/","url_meta":{"origin":2042,"position":5},"title":"Prepare and execute EADR &#8211; Cell Server on Windows 2012 R2 and Data Protector 9.06","date":"13. May 2016","format":false,"excerpt":"{:en} In the past I often informed about the free EADR feature in Data Protector to recover clients and cell server. The last time I wrote an article in 2014 including two small scripts to get things prepared and automated - see https:\/\/www.data-protector.org\/wordpress\/2014\/04\/eadr-cell-server-dp-8-1x-windows-2012-r2\/. However, the batch files got broken due\u2026","rel":"","context":"In &quot;HowTo&quot;","img":{"alt_text":"EADR_23","src":"https:\/\/i0.wp.com\/www.data-protector.org\/wordpress\/wp-content\/uploads\/2016\/05\/EADR_23.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/posts\/2042"}],"collection":[{"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/comments?post=2042"}],"version-history":[{"count":12,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/posts\/2042\/revisions"}],"predecessor-version":[{"id":2806,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/posts\/2042\/revisions\/2806"}],"wp:attachment":[{"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/media?parent=2042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/categories?post=2042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.data-protector.org\/wordpress\/wp-json\/wp\/v2\/tags?post=2042"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}