{"id":87005,"date":"2020-07-02T07:42:17","date_gmt":"2020-07-02T05:42:17","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/podvodnye-kamni-pri-perehode-na-vdi-chto-testirovat-zaranee-chtoby-ne-bylo-muchitelno-bolno"},"modified":"2020-07-02T07:42:17","modified_gmt":"2020-07-02T05:42:17","slug":"podvodnye-kamni-pri-perehode-na-vdi-chto-testirovat-zaranee-chtoby-ne-bylo-muchitelno-bolno","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/podvodnye-kamni-pri-perehode-na-vdi-chto-testirovat-zaranee-chtoby-ne-bylo-muchitelno-bolno","title":{"rendered":"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/ad59bcec7d84c1a5c31682f3cc6f097d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nKas olete kunagi m\u00f5elnud, mida skanner VDI-jaamas teeb? Alguses tundub k\u00f5ik hea: see tuvastatakse nagu tavaline USB-seade ja on \u201el\u00e4bipaistvalt\u201d n\u00e4htav virtuaalmachine'ist. Siis saadab kasutaja k\u00e4su skaneerimiseks, ja k\u00f5ik kukub kokku. Parimal juhul \u2014 skanneri draiver, halvemal juhul \u2014 m\u00f5ne minuti p\u00e4rast skanneri tarkvara, mis v\u00f5ib m\u00f5jutada ka teisi klastrikasutajaid. Miks? Sest viie megabaidi kokku surutud pildi saamiseks tuleb USB 2.0 kaudu edastada kaks-kolm korda rohkem andmeid. Bussi l\u00e4bilaskev\u00f5ime on 480 Mbit\/s. <\/p>\n<p>Seega tuleb testida kolme asja: kasutajakogemust, perifeeriat ja turvalisust \u2014 see on h\u00e4davajalik. Testimise viisid erinevad. \u00dcks v\u00f5imalus on paigaldada agent kohaliku seadme peale igasse virtuaalsesse t\u00f6\u00f6jaama. See on suhteliselt odav, kuid ei n\u00e4ita kanalikoormust ja ei arvuta protsessori koormust t\u00e4pselt. Teine variant on seadistada teises kohas vajalik hulk emulatorroboteid ja hakata neid \u00fchendama reaalse t\u00f6\u00f6jaamaga nagu tegelikud kasutajad. Teise v\u00f5imalusena tuleb juurde koormust ekraanivideosignaali edastamise protokollilt (t\u00e4psemalt, muudetud pikslitelt), v\u00f5rgupakettide anal\u00fc\u00fcsilt ja edastamiselt, mis selgitab kanalikoormust. Kanalit kontrollitakse \u00fcldiselt v\u00e4ga harva. <br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nKasutajakogemus (UX) t\u00e4hendab erinevate toimingute sooritamise kiirusest l\u00f5ppkasutaja poolt. On olemas testipakette, mis koormavad installeerimist sadade kasutajatega ja t\u00e4idavad nendele t\u00fc\u00fcpilisi tegevusi: k\u00e4ivitavad kontoriprogramme, loevad PDF-e, sirvivad, v\u00e4ga harva vaatavad pornot t\u00f6\u00f6ajal ja nii edasi. <\/p>\n<p>Toreda on hea n\u00e4ide sellest, miks sellised testid on enne t\u00e4htsad, oli viimasel paigaldusel. Seal tuhat kasutajat kolib VDI-sse, neil on kontor, brauser ja SAP. Ettev\u00f5tte IT-osakond on arenenud, seega on enne rakendusi testimisstandardi kultuur. Minu kogemuse kohaselt tuleb tavaliselt tellijat selliseks m\u00f5tlema veenda, sest kulud on suured ja kasu pole alati ilmne. On ju arvutusi, kus v\u00f5ib eksida? Tegelikkuses paljastavad sellised testid kohad, mida arvati, kuid ei saanud kontrollida.<\/p>\n<h3>Paigaldamine<\/h3>\n<p>\nKuus serverit, konfiguratsioon on j\u00e4rgmine:<\/p>\n<p><img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/6a38e91b25c01438fb7da56406e66f94.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKliendi SAN-i juurde meil juurdep\u00e4\u00e4su ei olnud; see pakuti juba teenusena. Aga me teame, et seal on all-flash. Milline t\u00e4pselt all-flash, ei tea, kuid sektsioonid on 10 TB. VDI on kliendi valitud VMware, kuna IT-meeskonnale on see juba tuttav ja k\u00f5ik sulandub \u00fcsna orgaaniliselt kokku terviklikuks infrastruktuuriks. VMware t\u00f5eliselt \"harjub\" oma \u00f6kos\u00fcsteemiga, kuid kui eelarvest ostmiseks piisab \u2014 aastaid v\u00f5ib mitte muretseda. Kuid see on sageli v\u00e4ga suur \"kui\". Meil on hea allahindlus ja klient teab sellest. <\/p>\n<p>Alustame teste, kuna IT-meeskond ei lase peaaegu midagi tootmisesse ilma testideta. VDI ei ole asi, mida saab lihtsalt k\u00e4ivitada ja siis aktsepteerida. Kasutajad laaditakse sisse j\u00e4rk-j\u00e4rgult ning probleemidega v\u00f5ib kokku puutuda isegi kuue kuu p\u00e4rast. Mida keegi loomulikult ei soovi. <\/p>\n<p>450 \u201ekasutajat\u201d testis, koormust genereerime kohapeal. Robootikakasutajad teevad erinevaid tegevusi samaaegselt, m\u00f5\u00f5dame iga operatsiooni aega paaritunnise t\u00f6\u00f6 jooksul:<\/p>\n<p><img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/48755255f04ca013a3f33da792fe340b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/8ce25607f36c61ec8b32b51b131e4e78.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/17446420d14a3497a5e00e22dfdd3ed1.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVaatele, kuidas serverid ja andmesalvestuss\u00fcsteem k\u00e4ituvad. Kas VDI suudab luua vajaliku arvu virtuaalseid t\u00f6\u00f6kohti jne. Kuna tellija ei valinud h\u00fcperkonvergeeritud lahendust, vaid valis v\u00e4lkm\u00e4luga andmesalvestuss\u00fcsteemi, tuli kontrollida ka suuruse seadistamise \u00f5igust. <\/p>\n<p><img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/4a2cd1d00d4ee7692fea50f92799563b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/3a7425597117a10d14d0798910d5a601.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/dfc8ee90724b9a2e4dbfd27ba078b5f7.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/5ff0f6d31cafa9b0a004db8fa5039528.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/d5927c20a064b567a68af9fa93f1d0da.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"VDI-le minevarud: mida testida ette, et v\u00e4ltida valusaid \u00fcllatusi\" src=\"\/wp-content\/uploads\/2020\/07\/0657f599af242aeefa1b3b21f3529bbd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKui kuskil on viivitusi - tuleb muuta VDI-farmi seadistusi, eelk\u00f5ige ressursside jaotust erinevate kategooriate kasutajate vahel. <\/p>\n<h3>Perifeeria<\/h3>\n<p>\nPerifeeriaga on tavaliselt kolm olukorda:<\/p>\n<ul>\n<li>Tellija \u00fctleb lihtsalt, et me ei \u00fchenda midagi (v\u00e4lja arvatud k\u00f5rvaklapid, need on tavaliselt \"karbist v\u00e4lja\" n\u00e4htavad). Viimased viis aastat olen v\u00e4ga harva n\u00e4inud k\u00f5rvaklappe, mis ise ei \u00fchenduks ja mida VMware ei haaraks. <\/li>\n<li>Teine l\u00e4henemine on see, et v\u00f5tame ja projektis VDI rakendamise raames muudame periferiat: v\u00f5tame meie ja tellija poolt testitud ja toetatud seadmed. Selline juhtum on arusaadavatel p\u00f5hjustel haruldane. <\/li>\n<li>Kolmas l\u00e4henemine on olemasoleva riistvara \u00fcleviimine. <\/li>\n<\/ul>\n<p>\nTeate juba skanneritega seotud probleeme: tuleb paigaldada vahepealne tarkvara t\u00f6\u00f6jaama (\u00f5huke klient), mis saab USB voogu, tihendab pildi ja saadab selle VDI-sse. Mitme teguri t\u00f5ttu ei ole see alati v\u00f5imalik: kui Win-klientides (koduarvutid ja \u00f5hukesed kliendid) on k\u00f5ik h\u00e4sti, siis *nix-kogumite puhul toetab tavaliselt VDI tarnija m\u00f5nda konkreetset distributsiooni ning hakkavad pihta tantsud nagu Mac-kliendi puhul. Minu m\u00e4lestuste j\u00e4rgi on v\u00e4he inimesi, kes on Linuxi installatsioonidest kohalikku printerit \u00fchendades saavutanud, et need debugimise etapis t\u00f6\u00f6taksid ilma pidevate tugiteenuste k\u00f5nede tegemiseta. Kuid see on juba positiivne, m\u00f5ni aeg tagasi \u2014 isegi lihtsalt selleks, et need t\u00f6\u00f6taksid. <\/p>\n<p>Videokonverents \u2014 k\u00f5ik kliendid tahavad varem v\u00f5i hiljem, et see t\u00f6\u00f6taks ja t\u00f6\u00f6taks h\u00e4sti. Kui serverifarm on \u00f5igesti projekteeritud, siis see t\u00f6\u00f6tab h\u00e4sti; kui vale, saame olukorra, kus helikonverentsi ajal suureneb koormus kanalil, lisaks ilmneb probleem, et pilt kuvatakse halvasti (full HD puudub, n\u00e4gu on 9\u201316 pikslit). Tekib v\u00e4ga suur t\u00e4iendav viivitus, kui ilmneb silmus kliendi, VDI t\u00f6\u00f6jaama, VKSe serveri, sealt teise VDI ja teise kliendi vahel. \u00d5ige on \u00fchenduda otse kliendist VKSe serverisse, mis n\u00f5uab veel \u00fche t\u00e4iendava komponenti paigaldamist. <\/p>\n<p>USB-m\u00e4lupulgad \u2014 nendega ei ole \u00fcldse probleeme, nutikaardid ja sarnased, k\u00f5ik t\u00f6\u00f6tab kohe v\u00e4lja kastist. Raskusi esineb viipemoodulite, etikettide printerite, seadmete (jah, ka selliseid oli) ja kassadega. Kuid k\u00f5ik on lahendatav. N\u00fcanssidega ja mitte ilma \u00fcllatusteta, kuid l\u00f5puks on see ikka v\u00f5imalik. <\/p>\n<p>Kui kasutaja vaatab YouTube'i VDI-teenusest, on see halvim olukord nii koormuse kui ka kanali jaoks. Enamik lahendusi pakub HTML5 video suunamist. Kompressitud fail edastatakse kliendile, kus see kuvatakse. V\u00f5i antakse kliendile link otse\u00fchenduseks brauseri ja videohostingu vahel (see on harvem). <\/p>\n<h3>Ohutus<\/h3>\n<p>\nTurvalisus kriitiliselt puudutab komponentide liitumiskohti ja kliendiseadmeid. \u00dches \u00f6kos\u00fcsteemis peaks k\u00f5ik toimima h\u00e4sti, kuid praktikas juhtub see 90% juhtudest ja midagi tuleb ikkagi t\u00e4iendada. Viimastel aastatel on olnud eriti mugav veel \u00fcks VMware ost - nad on integreerinud MDM-i seadmete haldamiseks ettev\u00f5ttes. VMware-l on hiljuti uudseid v\u00f5rgu tasakaalustajaid (endine Avi Networks), mis v\u00f5imaldavad jagada vooge aasta p\u00e4rast VDI \u00fcleandmist, n\u00e4iteks. Veel \u00fcks puhtalt VMware erip\u00e4ra on head filiaalide optimeerimise v\u00f5imalused, t\u00e4nu nende v\u00e4rskele ostule, kui nad soetasid ettev\u00f5tte VeloCloud, mis pakub SD-WAN-i filiaalv\u00f5rkudele.<\/p>\n<p>L\u00f5ppkasutaja vaatenurgast on arhitektuur ja teenusepakkuja peaaegu n\u00e4htamatud. Globaalne t\u00e4htsus on, et igale seadmele on saadaval klient, millega saab \u00fchendada tahvelarvutist, Mac'ist v\u00f5i Windows \u00f5hukesest kliendist. \u00dcksikute klientide toeks on isegi olnud teleritele, kuid n\u00fc\u00fcdseks on need \u00f5nneks kadunud. <\/p>\n<p>VDI-installatsiooni erip\u00e4ra on see, et l\u00f5ppkasutajal ei ole kodus tavaliselt arvutit. Tihti on ainult n\u00f5rk Android-tahvelarvuti (m\u00f5nikord isegi hiire v\u00f5i klaviatuuriga) v\u00f5i v\u00f5ib-olla on isegi vedanud ja saadud Windows XP s\u00fcsteem. Mis, nagu v\u00f5ite aimata, ei ole juba m\u00f5nda aega uuendatud. Ja see ei hakka kunagi uuenduma. V\u00f5i on olemas v\u00e4ga n\u00f5rgad masinad, kus klienti ei saa paigaldada, rakendused ei t\u00f6\u00f6ta, kasutaja ei saa t\u00f6\u00f6d teha. \u00d5nneks sobivad isegi v\u00e4ga n\u00f5rgad seadmed (kuigi mitte alati mugavalt, kuid siiski sobivad), ja see on VDI suur pluss. Mis puutub aga turvalisusesse, siis tuleb testida kliendi s\u00fcsteemide kompromiteerimist. See toimub piisavalt sageli. <\/p>\n<p>Vastas, et Rospotrebnadzori soovituste valguses ettev\u00f5tete t\u00f6\u00f6 korraldamiseks COVID-19 riski tingimustes on \u00fchendamine oma t\u00f6\u00f6kohtadega kontoris v\u00e4ga oluline. Tundub, et see olukord j\u00e4\u00e4b p\u00fcsima ja jah, kui m\u00f5tlesite VDI-le \u2014 v\u00f5ite alustada testimist. See tuleb kasuks. Soovitused leiad <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rospotrebnadzor.ru\/files\/news\/KORONOVIRUS\/%D0%A0%D0%B0%D0%B1%D0%BE%D1%82%D0%B0%20%D0%BF%D1%80%D0%B5%D0%B4%D0%BF%D1%80%D0%B8%D1%8F%D1%82%D0%B8%D0%B9.pdf\">siit<\/a><\/noindex>, selgitused <noindex><a rel=\"nofollow\" href=\"https:\/\/xn--80aesfpebagmfblc0a.xn--p1ai\/ai\/doc\/241\/attach\/rekomendacii_po_rabote_organizacij.pdf\">siit<\/a><\/noindex>. Oluline on, et VDI kaudu on v\u00f5imalik ka ruume \u00fcmber korraldada n\u00f5uete t\u00e4itmiseks. Regulaator kehtestab teatud distantseerimise normid. N\u00e4iteks ei tohi 50 m\u00b2 kontoris viibida enam kui viiel t\u00f6\u00f6tajal.<\/p>\n<p>Kui teil on VDI kohta k\u00fcsimusi, mis ei vaja kommentaare \u2014 siin on minu e-post: SSkryl@croc.ru.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/croc\/blog\/508750\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0417\u0430\u0434\u0443\u043c\u044b\u0432\u0430\u043b\u0438\u0441\u044c \u043a\u043e\u0433\u0434\u0430-\u043d\u0438\u0431\u0443\u0434\u044c, \u0447\u0442\u043e \u0434\u0435\u043b\u0430\u0435\u0442 \u0441\u043a\u0430\u043d\u0435\u0440 \u0441 VDI-\u0441\u0442\u0430\u043d\u0446\u0438\u0435\u0439? \u0421\u043d\u0430\u0447\u0430\u043b\u0430 \u0432\u0441\u0451 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0445\u043e\u0440\u043e\u0448\u043e: \u043e\u043d \u043f\u0440\u043e\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u043e\u0431\u044b\u0447\u043d\u043e\u0435 USB-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e \u0438 \u00ab\u043f\u0440\u043e\u0437\u0440\u0430\u0447\u043d\u043e\u00bb \u0432\u0438\u0434\u0435\u043d \u0441 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439 \u043c\u0430\u0448\u0438\u043d\u044b. \u0414\u0430\u043b\u044c\u0448\u0435 \u044e\u0437\u0435\u0440 \u0434\u0430\u0451\u0442 \u043a\u043e\u043c\u0430\u043d\u0434\u0443 \u043d\u0430 \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435, \u0438 \u0432\u0441\u0451 \u043a \u0447\u0435\u0440\u0442\u044f\u043c \u043f\u0430\u0434\u0430\u0435\u0442. \u0412 \u043b\u0443\u0447\u0448\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u2014 \u0434\u0440\u0430\u0439\u0432\u0435\u0440 \u0441\u043a\u0430\u043d\u0435\u0440\u0430, \u043f\u043e\u0445\u0443\u0436\u0435 \u2014 \u0447\u0435\u0440\u0435\u0437 \u043f\u0430\u0440\u0443 \u043c\u0438\u043d\u0443\u0442 \u0441\u043e\u0444\u0442 \u0441\u043a\u0430\u043d\u0435\u0440\u0430, \u043f\u043e\u0442\u043e\u043c \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0430\u0444\u0444\u0435\u043a\u0442\u0438\u0442\u044c \u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0430. \u041f\u043e\u0447\u0435\u043c\u0443? \u041f\u043e\u0442\u043e\u043c\u0443 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":87006,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-87005","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0417\u0430\u0434\u0443\u043c\u044b\u0432\u0430\u043b\u0438\u0441\u044c \u043a\u043e\u0433\u0434\u0430-\u043d\u0438\u0431\u0443\u0434\u044c, \u0447\u0442\u043e \u0434\u0435\u043b\u0430\u0435\u0442 \u0441\u043a\u0430\u043d\u0435\u0440 \u0441 VDI-\u0441\u0442\u0430\u043d\u0446\u0438\u0435\u0439? \u0421\u043d\u0430\u0447\u0430\u043b\u0430 \u0432\u0441\u0451 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0445\u043e\u0440\u043e\u0448\u043e: \u043e\u043d \u043f\u0440\u043e\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u043e\u0431\u044b\u0447\u043d\u043e\u0435 USB-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e \u0438 \u00ab\u043f\u0440\u043e\u0437\u0440\u0430\u0447\u043d\u043e\u00bb \u0432\u0438\u0434\u0435\u043d \u0441 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439 \u043c\u0430\u0448\u0438\u043d\u044b. \u0414\u0430\u043b\u044c\u0448\u0435 \u044e\u0437\u0435\u0440 \u0434\u0430\u0451\u0442 \u043a\u043e\u043c\u0430\u043d\u0434\u0443 \u043d\u0430 \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435, \u0438 \u0432\u0441\u0451 \u043a \u0447\u0435\u0440\u0442\u044f\u043c \u043f\u0430\u0434\u0430\u0435\u0442. \u0412 \u043b\u0443\u0447\u0448\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u2014 \u0434\u0440\u0430\u0439\u0432\u0435\u0440 \u0441\u043a\u0430\u043d\u0435\u0440\u0430, \u043f\u043e\u0445\u0443\u0436\u0435 \u2014 \u0447\u0435\u0440\u0435\u0437 \u043f\u0430\u0440\u0443 \u043c\u0438\u043d\u0443\u0442 \u0441\u043e\u0444\u0442 \u0441\u043a\u0430\u043d\u0435\u0440\u0430, \u043f\u043e\u0442\u043e\u043c \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0430\u0444\u0444\u0435\u043a\u0442\u0438\u0442\u044c \u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0430. \u041f\u043e\u0447\u0435\u043c\u0443? 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Algul n\u00e4eb k\u00f5ik hea v\u00e4lja: see t\u00f5ukab tavap\u00e4rast USB-seadet ja on virtuaalmasinast 'l\u00e4bipaistev'. Edasi annab kasutaja skaneerimis k\u00e4su ja k\u00f5ik kukub kokku. Parimal juhul l\u00f5puks skanneri draiver, halvemal juhul \u2014 paar minutit hiljem skanneri programm, mis v\u00f5ib seej\u00e4rel m\u00f5jutada ka teisi klastrikasutajaid. Miks? 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