iXsystems, moqapi oa morero oa FreeNAS, mabapi le mathata a tebileng a ho tsamaisana le ZFS le tse ling tsa li-hard drive tse ncha tsa WD Red tse lokollotsoeng ke Western Digital li sebelisa theknoloji ea SMR (Shingled Magnetic Recording). Boemong bo bobe ka ho fetesisa, ho sebelisa ZFS ho li-drive tse nang le mathata ho ka baka tahlehelo ea data.
Mathata a hlaha ka li-drive tsa WD Red tse nang le bokhoni ba ho tloha 2 ho isa ho 6 TB, tse hlahisitsoeng ho tloha 2018, tse sebelisang theknoloji ho rekota. (Sesebediswa-Managed Shingled Magnetic Recording) le Leibole ea EFAX (bakeng sa li-disk tsa CMR ho sebelisoa ID ea EFRX). Western Digital ho blog ea hae hore li-drive tsa WD Red SMR li etselitsoe ho sebelisoa NAS bakeng sa likhoebo tsa lapeng le tse nyane, tse kenyang li-drive tse fetang 8 mme li na le moroalo oa 180 TB ka selemo, e tloaelehileng bakeng sa bekapo le ho arolelana lifaele. Moloko o fetileng oa li-drive tsa WD Red le mefuta ea WD Red e nang le bokhoni ba 8 TB kapa ho feta, hammoho le li-drive tse tsoang mehala ea WD Red Pro, WD Gold le WD Ultrastar, li ntse li tsoela pele ho etsoa ho latela theknoloji ea CMR (Conventional Magnetic Recording) 'me tšebeliso ea bona ha e bake mathata le ZFS.
Ntho ea bohlokoa ea theknoloji ea SMR ke tšebeliso ea hlooho ea khoheli holim'a disk, eo bophara ba eona bo leng boholo ho feta bophara ba pina, e lebisang ho rekota ka karolo e itseng ea pina e haufi, i.e. leha e le efe ho rekota hape ho fella ka tlhokahalo ea ho rekota sehlopha sohle sa lipina. Ho ntlafatsa mosebetsi ka li-drive tse joalo, e sebelisoa - sebaka sa polokelo se arotsoe ka libaka tse etsang lihlopha tsa li-blocks kapa likarolo, tseo ho tsona ho kenyelletsoang ka tatellano ea data ho lumelloang ka ho ntlafatsa sehlopha sohle sa li-blocks. Ka kakaretso, li-drive tsa SMR li sebetsa hantle haholo, li theko e tlase, 'me li bonts'a melemo ea ts'ebetso bakeng sa ho ngola ka tatellano, empa ho lieha ha ho ngola ka mokhoa o sa reroang, ho kenyelletsa le ts'ebetso e joalo ka ho aha likarolo tsa polokelo bocha.
DM-SMR e fana ka maikutlo a hore lits'ebetso tsa ho arola le ho tsamaisa data li laoloa ke molaoli oa disk mme bakeng sa sistimi disk e joalo e shebahala joalo ka hard disk ea khale e sa hlokeng ho qhekelloa ka thoko. DM-SMR e sebelisa aterese e sa tobang ea "logical block addressing" (LBA, Logical Block Addressing), e hopotsang aterese e utloahalang ho li-drive tsa SSD. Mosebetsi o mong le o mong oa ho ngola o sa reroang o hloka ts'ebetso ea ho bokella litšila ka morao, e bakang liphetoho tse sa lebelloang tsa ts'ebetso. Sistimi e kanna ea leka ho sebelisa optimizations ho li-disk tse joalo, e lumela hore data e tla ngolloa lekala le boletsoeng, empa ha e le hantle, tlhaiso-leseling e fanoeng ke molaoli e etsa qeto ea sebopeho se nang le kelello feela, 'me ha e le hantle, ha o aba data, molaoli o tla e sebelisa. li-algorithms tse nkang lintlha tse fanoeng pele. Ka hona, pele u sebelisa li-disk tsa DM-SMR ka letamong la ZFS, ho kgothaletswa ho etsa opereishene ho li thibela le ho li khutlisetsa boemong ba tsona ba pele.
Western Digital e kentse letsoho ho hlahlobisisa maemo ao mathata a hlahang tlas'a ona, ao, hammoho le iXsystems, a lekang ho fumana tharollo le ho lokisetsa ntlafatso ea firmware. Pele o phatlalatsa liqeto mabapi le ho lokisa mathata, li-drive tse nang le firmware e ncha li reriloe ho lekoa ho li-storeges tse ngata tse nang le FreeNAS 11.3 le TrueNAS CORE 12.0. Ho boleloa hore ka lebaka la litlhaloso tse fapaneng tsa SMR ke bahlahisi ba fapaneng, mefuta e meng ea li-drive tsa SMR ha e na mathata le ZFS, empa tlhahlobo e entsoeng ke iXsystems e shebane feela le ho hlahloba li-drive tsa WD Red tse thehiloeng ho theknoloji ea DM-SMR, le bakeng sa SMR. kganna ho hlokahala lipatlisiso tse eketsehileng.
Hajoale, mathata a ZFS a netefalitsoe mme a phetoa litekong tsa bonyane li-drive tsa WD Red 4TB WD40EFAX tse nang le firmware 82.00A82 le phetoho ho boemo ba ho hlōleha tlas'a mojaro o phahameng oa ho ngola, mohlala, ha u etsa polokelo ea ho tsosolosa ka mor'a ho eketsa koloi e ncha ho sehlopha (resilvering). Ho lumeloa hore bothata bo hlaha mefuteng e meng ea WD Red e nang le firmware e tšoanang. Ha bothata bo hlaha, disk e qala ho khutlisa khoutu ea phoso ea IDNF (Sector ID Ha e Fumane) 'me e fetoha e sa sebelisoeng, e tšoaroang ho ZFS e le ho hlōleha ha disk mme e ka lebisa tahlehelong ea data e bolokiloeng ho disk. Haeba li-disk tse ngata li hloleha, data e ho vdev kapa letamo e ka lahleha. Hoa hlokomeloa hore liphoso tse boletsoeng li etsahala ka seoelo - ho tsoa ho litsamaiso tse ka bang sekete tsa FreeNAS Mini tse rekisitsoeng tse nang le li-disk tse nang le mathata, bothata bo hlahile maemong a ts'ebetso hang feela.
Source: opennet.ru