{"id":105497,"date":"2022-11-07T21:36:54","date_gmt":"2022-11-07T19:36:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predlozhen-mehanizm-blksnap-dlya-sozdaniya-snapshotov-blochnyh-ustrojstv-v-linux"},"modified":"2022-11-07T21:36:54","modified_gmt":"2022-11-07T19:36:54","slug":"predlozhen-mehanizm-blksnap-dlya-sozdaniya-snapshotov-blochnyh-ustrojstv-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/predlozhen-mehanizm-blksnap-dlya-sozdaniya-snapshotov-blochnyh-ustrojstv-v-linux","title":{"rendered":"A fost propus mecanismul blksnap pentru crearea de snapshot-uri ale dispozitivelor de stocare \u00een Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Compania Veeam, care dezvolt\u0103 software pentru backup \u0219i recuperare dup\u0103 dezastre, a propus includerea \u00een kernelul Linux a modulului blksnap, care implementeaz\u0103 un mecanism pentru crearea de snapshot-uri ale dispozitivelor block \u0219i urm\u0103rirea modific\u0103rilor \u00een acestea. Pentru gestionarea snapshot-urilor, a fost preg\u0103tit\u0103 o utilitar de linie de comand\u0103 blksnap \u0219i biblioteca blksnap.so, care permit interac\u021biunea cu modulul kernel din spa\u021biul utilizatorului prin apeluri ioctl. <\/p>\n

Scopul cre\u0103rii modulului este organizarea copiilor de rezerv\u0103 pentru unit\u0103\u021bi \u0219i discuri virtuale f\u0103r\u0103 a opri func\u021bionarea acestora \u2014 modulul permite capturarea st\u0103rii curente a \u00eentregului dispozitiv bloc \u00een snapshot, oferind pentru backup o sec\u021biune izolat\u0103, independent\u0103 de modific\u0103rile care continu\u0103 s\u0103 apar\u0103. O caracteristic\u0103 important\u0103 a blksnap este capacitatea de a crea simultan snapshot-uri pentru mai multe dispozitive bloc, ceea ce permite nu doar asigurarea integrit\u0103\u021bii datelor la nivelul dispozitivelor bloc, ci \u0219i ob\u021binerea coeren\u021bei st\u0103rii diferitelor dispozitive bloc \u00een backup. <\/p>\n

Pentru urm\u0103rirea modific\u0103rilor, \u00een subsistemul de dispozitive block (bdev) a fost ad\u0103ugat\u0103 posibilitatea de ata\u0219are a filtrelor care permit interceptarea cererilor de intrare \/ ie\u0219ire. \u00cen blksnap este implementat un filtru care intercept\u0103 cererile de scriere, cite\u0219te vechea valoare \u0219i o salveaz\u0103 \u00eentr-o list\u0103 separat\u0103 de modific\u0103ri, care define\u0219te starea snapshot-ului. Prin aceast\u0103 abordare, logica de lucru cu dispozitivul block nu se modific\u0103, scrierea \u00een dispozitivul block original se efectueaz\u0103 exact a\u0219a cum este, indiferent de snapshot-uri, ceea ce exclude posibilitatea deterior\u0103rii datelor \u0219i permite evitarea problemelor chiar \u0219i \u00een cazul apari\u021biei unor erori critice imprevizibile \u00een blksnap \u0219i a umplerii spa\u021biului alocat modific\u0103rilor. <\/p>\n

Modulul permite, printre altele, determinarea blocurilor care au fost modificate \u00een intervalul de timp dintre ultima \u0219i orice snapshot anterior, ceea ce poate fi utilizat pentru implementarea unei copii de rezerv\u0103 incrementale. Pentru p\u0103strarea modific\u0103rilor \u00een raport cu starea snapshot-ului, un interval arbitrar de sectoare poate fi alocat pe orice dispozitiv de bloc, permi\u021b\u00e2nd salvarea modific\u0103rilor \u00een fi\u0219iere separate \u00een cadrul FS pe dispozitivele de bloc. Dimensiunea zonei pentru stocarea modific\u0103rilor poate fi m\u0103rit\u0103 \u00een orice moment, chiar \u0219i dup\u0103 crearea snapshot-ului. <\/p>\n

Blksnap se bazeaz\u0103 pe codul modulului veeamsnap, care face parte din produsul Veeam Agent pentru Linux, dar a fost reproiectat av\u00e2nd \u00een vedere specificitatea livr\u0103rii \u00een principalul nucleu Linux. Distan\u021ba conceptului dintre blksnap \u0219i veeamsnap const\u0103 \u00een utilizarea unui sistem de filtre ata\u0219ate la dispozitivul de bloc, \u00een locul unui component separat bdevfilter care intercepta input\/output.
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Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-105497","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47 A fost propus mecanismul blksnap pentru crearea snapshot-urilor pentru dispozitivele de bloc \u00een Linux | ProHoster","description":"Compania Veeam, care dezvolt\u0103 software pentru copierea de rezerv\u0103 \u0219i recuperare dup\u0103 accidente, a propus includerea modulului blksnap \u00een nucleul Linux, cu realizarea mecanismului de creare a snapshot-urilor pentru dispozitivele de bloc.","canonical_url":"https:\/\/prohoster.info\/ro\/blog\/news\/predlozhen-mehanizm-blksnap-dlya-sozdaniya-snapshotov-blochnyh-ustrojstv-v-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"ro_RO","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c blksnap \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0441\u043d\u0430\u043f\u0448\u043e\u0442\u043e\u0432 \u0431\u043b\u043e\u0447\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0432 Linux | ProHoster","og:description":"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Veeam, \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u044e\u0449\u0430\u044f \u041f\u041e \u0434\u043b\u044f \u0440\u0435\u0437\u0435\u0440\u0432\u043d\u043e\u0433\u043e \u043a\u043e\u043f\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u043e\u0441\u043b\u0435 \u0430\u0432\u0430\u0440\u0438\u0439, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b\u0430 \u0434\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux \u043c\u043e\u0434\u0443\u043b\u044c blksnap \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0441\u043d\u0430\u043f\u0448\u043e\u0442\u043e\u0432 \u0431\u043b\u043e\u0447\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0438.","og:url":"https:\/\/prohoster.info\/ro\/blog\/news\/predlozhen-mehanizm-blksnap-dlya-sozdaniya-snapshotov-blochnyh-ustrojstv-v-linux","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2022-11-07T19:36:54+00:00","article:modified_time":"2022-11-07T19:36:54+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/posts\/105497","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/comments?post=105497"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/posts\/105497\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/media?parent=105497"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/categories?post=105497"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/ro\/wp-json\/wp\/v2\/tags?post=105497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}