Ib qho RAID array yog ib qho kev daws teeb meem uas sib txuas ntau lub hard drive rau hauv ib chav rau lub hom phiaj ntawm kev khaws cia, thaub qab, thiab muab kev rov ua dua thiab kev nyab xeeb. RAID 5, nrog disk striping thiab parity, yog qhov zoo tagnrho rau siv los ua cov ntaub ntawv khaws cia lossis daim ntawv thov server. Qhov kev xaiv no rau cov neeg siv Mac yuav tsum muaj tsawg kawg ntawm peb lub drives thiab muab kev ua txhaum cai thiab kev ua haujlwm zoo.
Ib qhov tsis txaus ntseeg ntawm cov disks ywj pheej (RAID) tiv thaiv qhov tsis ua haujlwm ntawm ib lub tsav thiab muab kev ua tau zoo dua qub thiab hloov pauv ceev ceev los ntawm kev khaws cov ntaub ntawv hla ntau lub disks.
Cov ntaub ntawv hauv kab lus no siv rau RAID 5 nrog Mac khiav macOS Catalina (10.15) dhau macOS Sierra (10.12).
RAID nta
Muaj ntau qib RAID suav nrog RAID 0, RAID 1, RAID 3, RAID 5, RAID 6, thiab RAID 10. Txhua pawg RAID muaj ib lossis ntau qhov ntawm cov yam ntxwv no:
- Disk striping hais txog kev faib cov ntaub ntawv rau hauv cov blocks thiab sau cov blocks hla ntau cov khoom siv cia.
- Disk mirroring hais txog kev muab cov ntaub ntawv luam tawm ntawm ob lossis ntau dua disks.
- Parity me ntsis suav cov ntaub ntawv hauv ob lub drives thiab khaws cov txiaj ntsig ntawm lub thib peb tsav rau lub hom phiaj ntawm kev ua txhaum cai.
RAID 5 yog qhov kev xaiv zoo tshaj plaws uas muab kev ua tau zoo thiab rov ua dua hauv qhov chaw nyeem ntawv siab.
About RAID 5 thiab Mac
RAID 5 yog qib RAID striping tsim los ua kom nrawm ntawm disk nyeem thiab sau ntawv. Ntau tus neeg siv Mac xaiv rau RAID 5 rau kev khaws ntaub ntawv multimedia. Nws qhov kev nyeem ntawv nrawm nrawm, thiab qhov kev sau ntawv tsuas yog qeeb me ntsis, vim qhov xav tau los suav thiab faib cov parity.
RAID 5 ua tau zoo ntawm kev khaws cov ntaub ntawv loj, qhov twg cov ntaub ntawv tau nyeem ua ntu zus. Cov ntaub ntawv me me, nkag mus rau qhov tsis sib xws muaj qhov ua tau zoo ntawm kev nyeem ntawv, thiab kev sau ntawv tuaj yeem ua haujlwm tsis zoo vim qhov xav tau rov suav dua thiab rov sau cov ntaub ntawv sib luag rau txhua qhov kev sau ntawv.
Txawm hais tias RAID 5 tuaj yeem siv nrog qhov sib xyaw disk qhov ntau thiab tsawg, qhov ntawd tsis suav tias yog txoj hauv kev nyiam vim tias RAID 5 array loj yog txhais los ntawm qhov tsawg tshaj plaws disk hauv cov teeb.
Xaiv RAID 5 Array Loj
RAID 5 arrays siv qhov sib npaug ntawm tus tsav rau khaws cia parity, uas txhais tau hais tias tag nrho cov array loj tuaj yeem suav nrog cov qauv:
S=d(n-1)
The d yog qhov tsawg tshaj plaws disk loj hauv array, thiab yog tus naj npawb ntawm cov disks uas tsim cov array.
How RAID 5 Ua Haujlwm
RAID 5 zoo ib yam li RAID 3 nyob rau hauv uas nws siv qhov sib luag me ntsis los xyuas kom meej cov ntaub ntawv. Txawm li cas los xij, tsis zoo li RAID 3, uas siv lub disk tshwj xeeb los khaws cov parity, RAID 5 faib qhov sib luag rau txhua qhov tsav hauv array.
RAID 5 muab rau kev ua haujlwm tsis ua haujlwm, tso cai rau ib qho kev tsav tsheb hauv array ua tsis tau yam tsis tau poob cov ntaub ntawv hauv array. Thaum tsav tsis tau, RAID 5 array tseem tuaj yeem siv los nyeem lossis sau cov ntaub ntawv. Tom qab hloov tsis tau lub tsav, RAID 5 array nkag mus rau cov ntaub ntawv rov qab hom, nyob rau hauv uas cov ntaub ntawv parity nyob rau hauv lub array yog siv los kho cov ntaub ntawv uas ploj lawm nyob rau hauv lub tshiab ntsia tsav.
Software-Based vs. Hardware-Based Controllers
Vim qhov xav tau los ua qhov sib npaug sib npaug thiab faib cov txiaj ntsig suav, RAID 5 yog qhov zoo tshaj plaws thaum ua haujlwm hauv cov khoom siv kho vajtse-raws li RAID enclosure.
Muaj ob hom RAID array controllers: kho vajtse thiab software. Software-based controllers raug nqi tsawg dua thiab muab cov neeg siv yooj yim thaum teeb tsa cov tsav. Hardware-based controllers raug nqi ntau dua tab sis pom zoo rau cov arrays nyuaj.
Lub Disk Utility app nrog rau Macs tsis txhawb tsim software-raws li RAID 5 arrays. Txawm li cas los xij, SoftRAID, los ntawm tus tsim tawm thib peb SoftRAID, Inc., tuaj yeem siv tau yog tias xav tau kev daws teeb meem software.
