RAID a me ka waihona nui

Manaʻo RAID

ʻO ke kumu nui o RAID ʻo ia ka hāʻawi ʻana i nā mana mālama kiʻekiʻe a me ka palekana data redundant no nā kikowaena nui. I loko o kahi ʻōnaehana, ʻike ʻia ʻo RAID ma ke ʻano he ʻāpana logical, akā ua haku ʻia me nā diski paʻakikī (ma ka liʻiliʻi ʻelua). Hoʻomaikaʻi nui ia i ka throughput ʻikepili o ka ʻōnaehana mālama ma o ka mālama ʻana a me ka hoʻihoʻi ʻana i ka ʻikepili ma nā disks he nui. Nui nā hoʻonohonoho RAID i nā ana piha no ka hōʻoia ʻana a me ka hoʻihoʻi ʻana, me ka hoʻihoʻi ʻana i ke aniani pololei. Hoʻonui nui kēia i ka hoʻomanawanui hewa o nā ʻōnaehana RAID a hoʻomaikaʻi i ka paʻa o ka ʻōnaehana a me ka redundancy, no laila ka huaʻōlelo "Redundant."

ʻO RAID kahi huahana kūʻokoʻa i hoʻohana ʻia ma ka pūnaewele SCSI, kaupalena ʻia e kāna ʻenehana a me ke kumukūʻai, ka mea i kāohi i kona hoʻomohala ʻana i ka mākeke haʻahaʻa. I kēia lā, me ka piʻi nui ʻana o ka ʻenehana RAID a me ka hoʻomau mau ʻana e nā mea hana, hiki i nā ʻenekini mālama ke hauʻoli i nā ʻōnaehana IDE-RAID ʻoi aku ka maikaʻi. ʻOiai ʻaʻole like paha ʻo IDE-RAID me SCSI-RAID ma ke ʻano o ka paʻa a me ka hilinaʻi, ʻo kāna mau hana maikaʻi ma luna o nā pahu paʻakikī hoʻokahi he mea hoʻowalewale i nā mea hoʻohana he nui. ʻOiaʻiʻo, no nā hana haʻahaʻa haʻahaʻa i kēlā me kēia lā, ʻoi aku ka IDE-RAID ma mua o ka hiki.

E like me nā modem, hiki ke hoʻokaʻawale ʻia ʻo RAID ma ke ʻano he polokalamu lako polokalamu, semi-software/semi-hardware, a i ʻole nā ​​​​mea hana paʻa. ʻO RAID lako polokalamu piha e pili ana iā RAID kahi e mālama ʻia ai nā hana a pau e ka ʻōnaehana hana (OS) a me ka CPU, me ka ʻole o ka mana o ka ʻaoʻao ʻekolu (i kapa ʻia ʻo RAID co-processor) a i ʻole chip I/O. I kēia hihia, hana ʻia nā hana a pau e pili ana i ka RAID e ka CPU, e hopena i ka haʻahaʻa haʻahaʻa ma waena o nā ʻano RAID. ʻAʻole nele ka Semi-software/semi-hardware RAID i kāna puʻupuʻu I/O ponoʻī, no laila ke kuleana o ka CPU a me nā polokalamu hoʻokele no kēia mau hana. Eia kekahi, ʻo ka RAID control/processing chips i hoʻohana ʻia i semi-software/semi-hardware RAID maʻamau he mau palena palena a ʻaʻole hiki ke kākoʻo i nā kiʻekiʻe RAID kiʻekiʻe. Hoʻopili ʻo RAID lako paʻa piha i kāna mana RAID ponoʻī / kaʻina hana a me nā ʻāpana hoʻoili I/O, a komo pū kekahi buffer array (Array Buffer). Hāʻawi ia i ka hana holoʻokoʻa maikaʻi loa a me ka hoʻohana ʻana i ka CPU ma waena o kēia mau ʻano ʻekolu, akā hele pū kekahi me ke kumukūʻai kiʻekiʻe loa. ʻO nā kāleka IDE RAID mua a me nā motherboards e hoʻohana ana i ka HighPoint HPT 368, 370, a me PROMISE chips i manaʻo ʻia he semi-software/semi-hardware RAID, no ka mea, nele lākou i nā kaʻina I/O i hoʻolaʻa ʻia. Eia kekahi, ʻaʻole hiki i ka RAID control/processing chips mai kēia mau hui ʻelua ke hiki ke mālama i nā hana hoʻoponopono paʻakikī, no laila ʻaʻole kākoʻo i ka pae RAID 5. ʻO kahi hiʻohiʻona kaulana o RAID lako paʻa piha ʻo ka AAA-UDMA RAID kāleka i hana ʻia e Adaptec. Hōʻike ia i kahi mea hoʻolaʻa kiʻekiʻe RAID co-processor a me Intel 960 kūikawā I/O processor, kākoʻo piha i ka RAID pae 5. Hōʻike ia i ka huahana IDE-RAID kiʻekiʻe loa i loaʻa i kēia manawa. Hoʻohālikelike ka Papa 1 i ka polokalamu RAID maʻamau a me ka RAID lako i nā noi ʻoihana.