iXsystems, tus tsim tawm ntawm FreeNAS project, txog cov teeb meem loj nrog ZFS kev sib raug zoo nrog qee qhov tshiab WD Red hard drives tso tawm los ntawm Western Digital siv SMR (Shingled Magnetic Recording) thev naus laus zis. Hauv qhov xwm txheej phem tshaj plaws, siv ZFS ntawm cov teeb meem drives tuaj yeem ua rau cov ntaub ntawv poob.
Teeb meem tshwm sim nrog WD Red drives nrog lub peev xwm ntawm 2 txog 6 TB, tsim los ntawm 2018, uas siv cov cuab yeej siv rau kev kaw (Device-Managed Shingled Magnetic Recording) thiab EFAX daim ntawv lo (rau CMR disks EFRX tus cim yog siv). Western Digital hauv nws qhov blog uas WD Red SMR drives yog tsim los siv hauv NAS rau hauv tsev thiab cov lag luam me, uas nruab tsis ntau tshaj 8 drives thiab muaj peev xwm thauj khoom ntawm 180 TB ib xyoos, ib txwm siv rau thaub qab thiab cov ntaub ntawv sib koom. Cov tiam dhau los ntawm WD Red drives thiab WD Red qauv nrog lub peev xwm ntawm 8 TB lossis ntau dua, nrog rau kev tsav tsheb los ntawm WD Red Pro, WD Kub thiab WD Ultrastar kab, txuas ntxiv tsim los ntawm CMR (Cov Ntawv Sib Nqus Sib Nqus) thev naus laus zis. thiab lawv siv tsis ua teeb meem nrog ZFS.
Lub ntsiab lus ntawm SMR thev naus laus zis yog kev siv lub taub hau sib nqus ntawm lub disk, qhov dav ntawm qhov ntau dua qhov dav ntawm kev khiav, uas ua rau cov ntaub ntawv nrog ib nrab sib tshooj ntawm cov kab uas nyob ib sab, i.e. ib qho rov sau cov txiaj ntsig hauv qhov yuav tsum tau rov sau tag nrho pawg ntawm cov lem. Txhawm rau txhim kho kev ua haujlwm nrog cov tsav zoo li no, nws yog siv - qhov chaw khaws cia tau muab faib ua cov cheeb tsam uas tsim cov pab pawg ntawm cov blocks lossis cov haujlwm, uas tsuas yog sib txuas ntxiv ntawm cov ntaub ntawv raug tso cai nrog kev hloov kho tag nrho pawg ntawm cov blocks. Feem ntau, SMR drives muaj lub zog ntau dua, pheej yig dua, thiab qhia cov txiaj ntsig kev ua tau zoo rau cov ntawv sau ua ntu zus, tab sis lag luam thaum ua cov ntawv sau tsis raug, suav nrog kev ua haujlwm xws li rov tsim kho cov chaw khaws cia.
DM-SMR txhais tau hais tias zoning thiab cov ntaub ntawv faib kev khiav hauj lwm yog tswj los ntawm lub disk tswj thiab rau lub system xws li ib tug disk zoo li ib tug classic hard disk uas tsis yuav tsum tau cais manipulations. DM-SMR siv qhov chaw nyob tsis ncaj nraim (LBA, Logical Block Addressing), nco txog qhov chaw nyob hauv SSD drives. Txhua qhov kev sau ntawv random yuav tsum tau ua haujlwm khaws cov khib nyiab tom qab, uas ua rau muaj kev hloov pauv tsis tau zoo. Lub kaw lus yuav sim siv cov kev ua kom zoo rau cov disks, ntseeg tias cov ntaub ntawv yuav raug sau rau hauv ntu ntu, tab sis qhov tseeb cov ntaub ntawv tawm los ntawm tus tswj xyuas tsuas yog txiav txim siab txog cov qauv tsim nyog thiab qhov tseeb, thaum faib cov ntaub ntawv, tus maub los yuav siv nws. tus kheej algorithms uas coj mus rau hauv tus account yav tas los faib cov ntaub ntawv. Yog li ntawd, ua ntej siv DM-SMR disks hauv lub pas dej ZFS, nws raug nquahu kom ua haujlwm kom xoom lawv thiab rov pib dua lawv mus rau lawv lub xeev qub.
Western Digital tau koom nrog hauv kev tshuaj xyuas cov xwm txheej hauv qab cov teeb meem tshwm sim, uas, nrog rau iXsystems, tab tom sim nrhiav kev daws teeb meem thiab npaj cov firmware hloov tshiab. Ua ntej tshaj tawm cov lus xaus txog kev kho cov teeb meem, cov tsav tsheb nrog lub firmware tshiab tau npaj los sim ntawm cov chaw khaws khoom siab nrog FreeNAS 11.3 thiab TrueNAS CORE 12.0. Nws tau hais tias vim muaj kev txhais lus sib txawv ntawm SMR los ntawm cov tuam txhab sib txawv, qee hom SMR drives tsis muaj teeb meem nrog ZFS, tab sis kev sim ua los ntawm iXsystems tsuas yog tsom rau kev kuaj xyuas WD Red drives raws li DM-SMR thev naus laus zis, thiab rau SMR. tsav yuav tsum tau tshawb fawb ntxiv.
Tam sim no, cov teeb meem nrog ZFS tau raug pov thawj thiab rov ua dua hauv kev sim tsawg kawg WD Red 4TB WD40EFAX tsav nrog firmware 82.00A82 thiab hloov mus rau lub xeev tsis ua hauj lwm nyob rau hauv siab sau load, piv txwv li, thaum ua ib tug cia rebuild tom qab ntxiv ib tug tshiab tsav rau lub array (resilvering). Nws ntseeg tau tias qhov teeb meem tshwm sim ntawm lwm yam WD Red qauv nrog tib lub firmware. Thaum muaj teeb meem tshwm sim, lub disk pib rov qab ib qho IDNF (Sector ID Tsis Pom) yuam kev code thiab ua tsis tau, uas yog kho hauv ZFS raws li disk tsis ua haujlwm thiab tuaj yeem ua rau poob ntawm cov ntaub ntawv khaws cia hauv disk. Yog tias ntau lub disks tsis ua haujlwm, cov ntaub ntawv hauv vdev lossis pas dej yuav poob. Nws tau raug sau tseg tias cov lus hais tsis zoo tshwm sim tsis tshua muaj - tawm ntawm ib txhiab FreeNAS Mini tshuab muag uas tau nruab nrog cov teeb meem disks, qhov teeb meem tshwm sim hauv kev ua haujlwm ib zaug xwb.
Tau qhov twg los: opennet.ru