Malingaliro a kampani RAID
Cholinga chachikulu cha RAID ndikupereka mphamvu zosungirako zosungirako zosungirako zosungirako zosungirako zosungirako komanso chitetezo cha data chosafunikira kwa ma seva akuluakulu. M'dongosolo, RAID imawoneka ngati gawo loyenera, koma limapangidwa ndi ma hard disks angapo (osachepera awiri). Zimathandizira kwambiri kutulutsa kwa data pamakina osungirako posungira nthawi imodzi ndikubwezeretsanso deta pama disks angapo. Zosintha zambiri za RAID zimakhala ndi miyeso yokwanira yotsimikizirana / kubwezeretsanso, kuphatikiza kusunga magalasi achindunji. Izi zimakulitsa kwambiri kulolerana kwa zolakwika za machitidwe a RAID ndikuwongolera kukhazikika kwadongosolo ndi kusagwira ntchito, motero mawu akuti "Redundant."
RAID inali chinthu chokhacho chomwe chili mu domain la SCSI, chocheperako ndiukadaulo wake komanso mtengo wake, zomwe zidalepheretsa chitukuko chake pamsika wotsika. Masiku ano, ndikukula kwaukadaulo wa RAID komanso kuyesetsa kosalekeza kwa opanga, mainjiniya osungira amatha kusangalala ndi machitidwe otsika mtengo a IDE-RAID. Ngakhale IDE-RAID ingafanane ndi SCSI-RAID pa kukhazikika ndi kudalirika, ubwino wake pa ma hard drive amodzi ndiwokopa kwambiri kwa ogwiritsa ntchito ambiri. M'malo mwake, pamachitidwe otsika kwambiri tsiku lililonse, IDE-RAID ndiyoposa kuthekera.
Mofanana ndi ma modemu, RAID ikhoza kugawidwa m'magulu onse a mapulogalamu, semi-software/semi-hardware, kapena hardware-based. Pulogalamu ya RAID yathunthu imatanthawuza RAID pomwe ntchito zonse zimayendetsedwa ndi makina opangira (OS) ndi CPU, popanda kuwongolera / kukonza kwa gulu lachitatu (lomwe limatchedwa RAID co-processor) kapena I/O chip. Pachifukwa ichi, ntchito zonse zokhudzana ndi RAID zimachitidwa ndi CPU, zomwe zimapangitsa kuti zikhale zotsika kwambiri pakati pa mitundu ya RAID. Semi-software/semi-hardware RAID kwenikweni ilibe I/O processing chip, kotero CPU ndi madalaivala mapulogalamu ali ndi udindo pa ntchito zimenezi. Kuphatikiza apo, ma RAID control/processing chips omwe amagwiritsidwa ntchito mu semi-software/semi-hardware RAID nthawi zambiri amakhala ndi mphamvu zochepa ndipo sangathe kuthandizira ma RAID apamwamba. RAID ya hardware yathunthu imaphatikizapo kuwongolera / kukonza kwa RAID ndi tchipisi ta I/O, ndipo imaphatikizanso buffer (Array Buffer). Imapereka magwiridwe antchito abwino kwambiri komanso kugwiritsa ntchito CPU pakati pa mitundu itatuyi, komanso imabwera ndi mtengo wapamwamba kwambiri wa zida. Makhadi oyambilira a IDE RAID ndi ma board a amayi omwe amagwiritsa ntchito HighPoint HPT 368, 370, ndi tchipisi cha PROMISE amaonedwa kuti ndi semi-software/semi-hardware RAID, popeza analibe mapurosesa odzipatulira a I/O. Komanso, RAID control/processing chips kuchokera ku makampani awiriwa anali ndi mphamvu zochepa ndipo sankatha kugwira ntchito zovuta zowonongeka, choncho sagwirizana ndi mlingo wa RAID 5. Chitsanzo chodziwika bwino cha hardware RAID ndi khadi la AAA-UDMA RAID lopangidwa ndi Adaptec. Imakhala ndi purosesa yapamwamba kwambiri ya RAID ndi purosesa ya Intel 960 yapadera ya I / O, yothandizira mokwanira mlingo wa RAID 5. Imayimira mankhwala apamwamba kwambiri a IDE-RAID omwe alipo panopa. Table 1 ikufanizira RAID yodziwika bwino ya mapulogalamu ndi hardware RAID mu ntchito zamakampani.
Nthawi yotumiza: Jul-11-2023
