Tölvumál - 01.01.2007, Blaðsíða 34

Tölvumál - 01.01.2007, Blaðsíða 34
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10101010001101001011010101010101101011010101000101101110010100101011101010100101010101000110100101101010101010110101101010100010110111001010010101110101 01001010101010001101001011010101010101101011010101000101101110010100101011101010100101010101000110100101101010101010110101101010100010110111001010010101 Augljós kostur SAN var fl estum ljós þar sem áður höfðu fl estir neþjónar tengst sínum diskum beint (Direct Attached Storage – DASD) með tilheyrandi óhagræði. T.d. var ekki nokkur leið að deila lausu diskaplássi á einum netþjóni með öðrum þjónum. Þar af leiðandi mynduðust dreifðar eyjur af lausu plássi sem aftur urðu til þess að tölvudeildir þurftu að kaupa miklu meira af diskum en nauðsynlegt var ef samnýting væri möguleg. Hagræðið var því augljóst en þessar lausnir voru tiltölulega dýrar og ekki á færi allra fyrirtækja og stofnana. Þegar SAN lausnir tóku svo að lækka í verði jókst innleiðing þeirra kannski hraðar en umsjónarmenn sáu fyrir eða réðu við og aftur mynduðust einangraðar SAN eyjar þar sam hagræðið sem hafði áunnist með SAN- væðingunni tók að ganga til baka. Einfaldari umsjón með Storage Virtualization Til að einfalda umsjón hafa framleiðendur kynnt til sögunnar lausnir sem Nýjungar Gríðarlegar framfarir hafa átt sér stað í miðlægum gagnageymslulausnum síðastliðin ár og skemmst að minnast þeirra breytinga sem Storage Area Networking (SAN) hafði á gagnageymsluumhverfi fyrirtækja um síðustu aldamót en um er að ræða gagnanet sem gerði miðlægum diskalausnum kleift að tengjast mörgum netþjónum og dreifa plássi og álagi á milli þeirra. gagnageymslulausnum í byggja á sýndargagnageymslumhverfi (Storage Virtualization). Í raun hefur ,,virtualization” í sinni einföldustu mynd verið til staðar í gagnageymslukerfum allt frá áttunda áratugnum, þ.e. í formi RAID (Redundant Array of Independant Disks). RAID sýnir einmitt netþjóninum annað útlit á undirliggjandi gagnasvæði en þá hörða diska sem eru til grundavallar, hver í sínu lagi. Storage Networking Industry Association (SNIA) skilgreinir svo ,,Storage Virtualization” eða ,,Block Aggregation” sem lausn sem slítur í sundur lógískt umhverfi (logical view) og hlutlægt umhverfi (physical view) gagnaumhverfi sins. Þrír megin fl okkar Storage Virtualization Eins og sjá má á myndinni skiptir SNIA Storage Virtualization í þrjá grunnfl okka. Í fyrsta lagi ,,Host-based” þar sem sýndarumhverfi ð er keyrt á netþjóninum sjálfum, t.d. í formi rekils eða ,,Device Driver”, í öðru lagi 2.tbl-31.arg.indd 14.1.2 07, 22:3434

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