SAS-log: los, hauj lwm, kev yam ntxwv ntawm tus ntaus ntawv

Muas ib tug array los yog neeg rau zaub mov rau lub khw ntxiv, peb tso tseg nyob rau hauv pem hauv ntej ntawm ib tug kev xaiv: dab tsi txog cov hard drive ntsia. Cov feem nrov yog cov nram qab no ntawm cov zog drives: SAS, SATA thiab NL-SAS. Cov peb hom yuav mus rau tus ceev tshaj cia tawm, lawv khaws cia feem ntau ntawm cov ntaub ntawv nyob rau hauv lub ntiaj teb no. Peb tsab xov xwm tsom rau tus thawj hom. Peb saib zoo li cas yog SAS-drives, raws li zoo raws li lawv tsis, thiab dab tsi yog qhov txawv ntawm cov theem pib hom ntawm cov pab kiag li lawm.

kev yam ntxwv

SAS-log hloov lub SCSI-hom. Lawv tau ua tus txheej txheem tshiab nyob rau hauv enterprise-class cia ntaub ntawv. Ntawm peb hom SAS-drives yog suav hais tias yog feem ntau txhim khu kev qha, lawv yuav tau ua kom muaj kev ua tau zoo nyob rau hauv ib tug heev yooj yim khiav hauj lwm tej yam kev mob. SAS drives ua zoo npaum li cas hom NL drives los yog SATA. Qhov taw qhia sawv kev ntseeg parameter xws li me ntsis kev ua yuam kev npaum li cas. Nws txiav txim yuav ua li cas tej zaum yuav muaj ib me ntsis kev ua yuam kev tej zaum yuav tshwm sim nyob rau hauv lub xov xwm cov ntaub ntawv. Cov kev ua yuam kev npaum li cas rau lub SAS HDD hom yog feem ntau ib chav tsev ntawm 10 ¹⁶ khoom. Hais tias yog, nws txhais tau tias muaj tseeb los ntawm ib tug kev ua yuam kev tej zaum yuav tshwm sim nyob rau hauv ib tug ntawm kaum quadrillion khoom. Piv txwv li, peb yuav sib piv cov nqi nrog rau ib qho kev ua yuam kev muaj nuj nqis nyob rau hauv lub SATA hard disk hom, qhov twg nws yog ib tug ntawm cov 10 ¹⁵ (los yog ib tug quadrillion). Raws li yuav pom, lub SATA-HDD tiv thaiv no kuj heev, txawm li cas los, thaum muaj ib lo lus nug txog cov kev tiv thaiv ntawm muab cov ntaub ntawv, qhov txawv ntawm ib tug txiav txim yog ib qho tseem ceeb heev.

SAS-log ua los ntawm adhering rau stricter qauv tshaj nyob rau hauv txoj kev loj hlob ntawm lwm yam drives. Yog li, qhov no technology yog yus muaj los ntawm lub sij hawm ntawm failures, ntawm 1.6 lab cov sij hawm thiab SATA-Technology - 1.2 million. Nyob rau hauv tas li ntawd mus rau cov tsis, lub controllers thiab drives ntawm no hom muaj ntau ntau commands uas yog npaj rau cov mob. Tej yam no ua no technology ntau npaum li SATA. Qhov no yog tshwj xeeb yog tshwm nyob rau hauv tus neeg mob ntawm kev quab yuam majeure.

NL-drives

Qhov no technology yog ib tug "tshiab player" nyob rau hauv kev ua lag luam. NL-log yog hybrid: SATA-HDD nrog SAS hom connector. Uas yog, tus ceev thiab cov filling lub taub hau coj los ntawm cov SATA-technology, thiab cov interface yog tau siab tshaj SAS. NL-technology xam tau tias yog ua tsis tau zoo disks nyob rau hauv qhov kev kawm (vim lub kuj tsis tshua muaj muab ceev). Txawm li cas los, nws yog tag nrho raws li lawv nyob rau hauv qhov kev txiav txim ntawm lub pawg, raws li zoo raws li multi-streaming thiab kev pab txhawb nqa ntau yam fwjchim luj kawg nkaus.

Tagirovannaya kev txiav txim ntawm xa commands thiab multi-streaming

Tib mus tswj ntau yam poob lawm ntawm daim ntawv cia, thiab cia maub los kom ntaub ntawv yog kis tau feem ntau nraaj. SAS-technology muab rau ob peb full-ob lub tsev raws ntawm cov ntaub ntawv, uas muab ceev nkag tau mus rau muab cov ntaub ntawv. Ib tug nyuaj tsav SAS-hom yuav tswj tau los ntawm ob peb PCs tsis muaj kev siv ntawm keyboards.

xaus

Nyob rau hauv qhov tseeb, SAS thiab SATA technologies yog tsim rau txawv hom phiaj: ua ntej rau tim kam thiab kev kawm ntawv, thiab lub thib ob - los xyuas kom meej qhov ntim. Li ntawd lawv thiaj tsis muaj mus sib tw nrog txhua lwm yam.