{"id":1101,"date":"2014-05-31T10:12:03","date_gmt":"2014-05-31T10:12:03","guid":{"rendered":"http:\/\/tomaskalabis.com\/wordpress\/?p=1101"},"modified":"2016-03-09T09:01:05","modified_gmt":"2016-03-09T09:01:05","slug":"sas-nl-sas-sata","status":"publish","type":"post","link":"https:\/\/tomaskalabis.com\/wordpress\/sas-nl-sas-sata\/","title":{"rendered":"Hardware: SAS, NL-SAS a SATA"},"content":{"rendered":"<p>V tomto \u010dl\u00e1nku se zam\u011b\u0159\u00edme na rozd\u00edly ve spolehlivosti a v\u00fdkonu mezi SAS, Near-Line SAS a SATA disk\u016f.<\/p>\n<p>Pokud uva\u017eujete o koupi serveru \u010di storage m\u00e1te na v\u00fdb\u011br mezi t\u0159emi druhy pevn\u00fdch disk\u016f a to: Serial Attached SCSI (SAS), Near-Line SAS (NL-SAS) a Serial ATA (SATA) &#8211; pokud budeme uva\u017eovat o rotuj\u00edc\u00edm za\u0159\u00edzen\u00ed a n\u00e9 flashov\u00e9m jako jsou SSD disky.<\/p>\n<p><a href=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2014\/05\/sas_vs_sata.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1103\" src=\"http:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2014\/05\/sas_vs_sata.jpg\" alt=\"sas_vs_sata\" width=\"454\" height=\"305\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2014\/05\/sas_vs_sata.jpg 454w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2014\/05\/sas_vs_sata-288x193.jpg 288w\" sizes=\"(max-width: 454px) 100vw, 454px\" \/><\/a><\/p>\n<p><strong>Serial Attached SCSI (SAS)<\/strong><\/p>\n<p>SAS disky nahradily star\u0161\u00ed verzi SCSI disk\u016f jejich\u017e po\u010d\u00e1tky panuj\u00ed ji\u017e v 80 letech. Umo\u017e\u0148uj\u00ed zp\u011btnou kompatibilitu s disky typu SATA v.2 a nov\u011bj\u0161\u00ed &#8211; \u00a0disk typu SATA m\u016f\u017eeme p\u0159ipojit k backplane SAS, ov\u0161em naopak &#8211; tedy SAS &gt; SATA to mo\u017en\u00e9 nen\u00ed. Z t\u011bchto t\u0159\u00ed druh\u016f disk\u016f pat\u0159\u00ed SAS mezi ty nejspolehliv\u011bj\u0161\u00ed, udr\u017euj\u00ed si svoji v\u00fdkonnost i ve zt\u00ed\u017een\u00fdch podm\u00ednk\u00e1ch.<\/p>\n<p><strong>NL &#8211; SAS<\/strong><\/p>\n<p>Osobn\u011b Near-Line SAS bych ozna\u010dil jako nov\u00e1\u010dka. Pokud ch\u00e1peme problematiku SAS a SATA nen\u00ed probl\u00e9m pochopit NL-SAS. Laicky lze \u0159\u00edci, \u017ee se jedn\u00e1 o disky SATA s konektorem SAS &#8211; tedy NL-SAS disky jsou SATA disky s rozhran\u00edm SAS, vnit\u0159nosti disku jsou postaveny na t\u0159\u00edd\u011b SATA. Pokud se bav\u00edme o spolehlivosti, nesm\u00edme se nechat zm\u00e1st ozna\u010den\u00edm SAS, proto\u017ee NL-SAS disky se ot\u00e1\u010dej\u00ed rychlost\u00ed 7.2k za minutu jako v\u011bt\u0161ina SATA disk\u016f.<\/p>\n<p><strong>SATA<\/strong><\/p>\n<p>Pokud srovn\u00e1me rozhran\u00ed NL-SAS a SAS se SATA, m\u016f\u017eeme s klidem \u0159\u00edci, \u017ee SATA sice nem\u00e1 takov\u00fd v\u00fdkon jako 2 zb\u00fdvaj\u00edc\u00ed, ale i nad\u00e1le jsou z\u00e1sadn\u00ed sou\u010d\u00e1st\u00ed \u00falo\u017en\u00e9ho syst\u00e9mu jak\u00e9koliv orgranizace, zejm\u00e9na pro b\u011b\u017en\u00e9 low-tier masov\u00e9 pot\u0159eby pro ukl\u00e1d\u00e1n\u00ed dat.<\/p>\n<p><strong>Kapacita (standardy) a rychlosti<\/strong><\/p>\n<ul>\n<li>SAS: 300GB, 600GB, 900GB \u2013 z\u00e1le\u017e\u00ed na v\u00fdrobci<\/li>\n<li>NL \u2013 SAS, SATA \u2013 1TB, 2 TB, 3TB a 4TB \u2013 z\u00e1le\u017e\u00ed na v\u00fdrobci<\/li>\n<li>7200 RPM = 80 IOPS<\/li>\n<li>10k RPM = 130 IOPS<\/li>\n<li>15k RPM = 180 IOPS<\/li>\n<\/ul>\n<p><strong>Rychlost rozhran\u00ed<\/strong><\/p>\n<p>Jak pro technologii SAS, NL \u2013 SAS i SATA m\u016f\u017eeme ozna\u010dit jako standart 3Gbps nebo 6Gbps (3G, 6G), nesm\u00edme zapom\u00ednat na to, \u017ee pokud m\u00e1me z\u00e1kladn\u00ed desku s\u00a0rozhran\u00edm 3G a disk 6G rychlost bude pouze 3G.<\/p>\n<p><strong>Spolehlivost a kvalita<\/strong><\/p>\n<p>Pokud srovn\u00e1me st\u0159edn\u00ed dobu mezi poruchami (MTBF) u technologi\u00ed SATA a NL \u2013 SAS, je hodnota toto\u017en\u00e1 a to 1,2 milionu hodin \u2013 136 let. Zat\u00edm co SAS disky maj\u00ed MTBF 1,6 milionu hodin -182 let. SAS disky se tak\u00e9 vyzna\u010duj\u00ed 10x vy\u0161\u0161\u00ed spolehlivost\u00ed pokud se bav\u00edme o Bit Error Rate \u2013 chyba \u010dten\u00ed, ne\u017e SATA nebo NL-SAS.<\/p>\n<p><strong>Moje doporu\u010den\u00ed:<\/strong><\/p>\n<ul>\n<li>Pokud chci maxim\u00e1ln\u00ed v\u00fdkon stejn\u011b jako kvalitu, nezb\u00fdv\u00e1 nic jin\u00e9ho ne\u017e j\u00edt do SAS na 10k nebo 15k RPM.<\/li>\n<li>Pokud chci dobrou kvalitu a vysokou kapacitu, nab\u00edz\u00ed se \u0159e\u0161en\u00ed NL-SAS s\u00a0rychlost\u00ed 7.2k RPM<\/li>\n<li>Pokud chci levn\u00fd velkokapacitn\u00ed \u00falo\u017en\u00fd prostor, vyberte SATA s\u00a0rychlost\u00ed 7.2k RPM<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>V tomto \u010dl\u00e1nku se zam\u011b\u0159\u00edme na rozd\u00edly ve spolehlivosti a v\u00fdkonu mezi SAS, Near-Line SAS a SATA disk\u016f. Pokud uva\u017eujete o koupi serveru \u010di storage m\u00e1te na v\u00fdb\u011br mezi t\u0159emi &#8230;<\/p>\n","protected":false},"author":2,"featured_media":2091,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[105],"tags":[107,106,108],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hardware: SAS, NL-SAS a SATA<\/title>\n<meta name=\"description\" content=\"Hardware: SAS, NL-SAS a SATA. 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