Tölvumál - 01.01.2007, Blaðsíða 35

Tölvumál - 01.01.2007, Blaðsíða 35
T Ö LV U M Á L | 3 5 Skv. SNIA má skipta þessum lausnum upp í þá flokka sem sjá má á Mynd 1. Mynd 1-1 SNIA Block Aggregation Model ,,SAN-based” þar sem það getur farið fram í gagnanetinu sjálfu og að lokum ,,Device based” þar sem það fer fram í stýringunni sjálfri. Allar þessar lausnir eiga það sameiginlegt að geta spannað meira en eina stýringu eða einstaka gagnamiðlara og því flokkast stýring sem eingöngu býr til sýndarumhverfi innan einnar stýringar ekki sem ,,Storage Virtualization” skv. skilgreiningu SNIA (Ekki frekar en RAID skv. sömu skilgreiningu). Eitt umsjónarumhverfi Auk þess að leysa vandamál tengd SAN-eyjum eins og lýst hefur verið hér að ofan er meiri ávinningur af SAN lausnum sem vert er að nefna. Í sýndar- gagnaumhverfi líta margir gagnamiðlarar út sem ein auðlind frá bæjardyrum netþjónsins og umsjónarmannsins. Hann þarf ekki að kunna á margs konar umsjónarhugbúnað til að stjórna þessum gagnamiðlurum, heldur er aðeins eitt umsjónarumhverfi sem snýr að sýndarumhverfinu. Einfaldari og hagkvæmari rekstur með sýndar-gagnaumhverfi Í sýndar-gagnaumhverfi er mun auðveldara að eiga við þann ofurvöxt sem flest fyrirtæki eiga við að etja í sínum gagnaumhverfum. Komi að því að tiltekinn gagnamiðlari fyllist, eða taka eigi hann úr þjónustu er afar einfalt mál að flytja öll gagnasvæði af honum, án þess að komi til rekstrarstöðvunar tengdra netþjóna. Að sama skapi er mun auðveldara að tryggja uppitíma Sigurður H. Ólafsson Vörustjóri gagnageymslulausna hjá Nýherja og aðgengi að gögnum. Flestir þeir sem reka einhvers konar SAN tengda gagnamiðlara þekkja það að þurfa að taka þá niður vegna einhverskonar viðhalds eða uppfærslu. Þó aðgerðin sjálf taki stuttan tíma er það veruleg röskun á rekstrarumhverfinu því einnig þarf að taka niður alla netþjóna sem tengjast umhverfinu. Sé gagnamiðlarinn hluti af sýndarumhverfi kemur þetta ekki niður á rekstri því einfalt mál er að flytja gögnin yfir á aðra gagnamiðlara í umhverfinu. Sýndarumhverfið býður einnig upp á sameiginlegan grundvöll fyrir ýmsar aðgerðir (Advanced Copy Functions). Má nefna stöðumyndir (Point in Time Copy/Snapshot) eða speglun á milli staða (Remote Mirroring). Þá fara þessar aðgerðir fram í sýndarlaginu og eru þ.a.l. ekki háðar gerð eða framleiðanda gagnamiðlararns, auk þess sem hægt er að taka t.d. stöðumyndir á milli mismunandi og jafnvel ólíkra gagnamiðlara. Flestir stærstu framleiðendur gagnageymslulausna eru komnir með sýndarlausnir, eða nálægt því að koma með þær á markað í dag og fróðlegt verður að fylgjast með því hverju fram vindur í þessum efnum. Heimildir: http://www.snia.org http://www.ibm.com/servers/storage/software/virtualization File/record subsystem S to ra g e d o m ai n Database (dbms) File System (FS) Block Subsystem Host-based block aggregation SAN-based block aggregation Device-based block aggregation Application Storage devises (disks, ....) Block Aggregation S er vi ce s su b sy st em D is co ve ry , M on ito rin g R es ou rc e m gm t, co nf ig ur at io n S ec ur ity , b ill in g R ed un da nc y m gm t ( ba ck up , . ..) 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