{"id":184270,"date":"2026-11-15T11:45:19","date_gmt":"2026-11-15T09:45:26","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/predstavlen-xraid-s-realizacziej-raid-dlya-xfs"},"modified":"2026-11-15T11:45:30","modified_gmt":"2026-11-15T09:45:30","slug":"xraid-introduced-with-raid-implementation-for-xfs","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/xraid-introduced-with-raid-implementation-for-xfs","title":{"rendered":"Predstavljen je XRAID s implementacijom RAID za XFS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Christoph Hellwig, maintainer of the DMA, KVM, Slab Allocator subsystems and PowerPC architecture in the Linux kernel, introduced the first public release of XRAID, an implementation of declustered RAID with parity control integrated into the XFS file system. The project was created to enable the use of RAID on zoned storage devices, such as SMR (Shingled Magnetic Recording) disks, and to provide a high-performance RAID implementation for maintaining data integrity. In addition to zoned devices, XRAID also supports operation on standard hard drives and SSDs, demonstrating a significant performance gain compared to mdraid (up to 20 times during writing) on the latter.<\/p>\n

XRAID uses a declustered parity control for distributing information across drives, similar to dRAID in OpenZFS, where no dedicated drives are allocated for hot spare; instead, data, parity information, and spare space are evenly distributed across all drives. The reading, writing, and recovery processes in case of failures cover all available drives, which increases throughput, reduces load on individual disks, avoids noticeable performance drops during failures, and significantly speeds up the rebuilding process after adding or replacing drives.<\/p>\n

Declustered RAIDs also simplify the creation of fault-tolerant arrays with a very large number of disks. During recovery after failures, XRAID dynamically determines the order of rebuilding drives, prioritizing areas with greater loss of redundant information and rebuilding data zones before parity information zones.<\/p>\n

XRAID se prvotno razvijao s ciljem omogu\u0107avanja kori\u0161tenja s zoniranim pohranama, \u010diji je prostor za pohranu podijeljen u zone koje \u010dine grupe blokova ili sektora. U takvim ure\u0111ajima dopu\u0161teno je samo sekvencijalno dodavanje podataka uz potpuno a\u017euriranje cijele grupe blokova. Na primjer, zoni\u010dna zapisna metoda se koristi u SMR diskovima (Shingled Magnetic Recording), gdje je \u0161irina staze manja od \u0161irine magnetske glave, a zapis se obavlja s djelomi\u010dnim preklapanjem susjedne staze, tj. bilo kakvo ponovo pisanje zahtijeva ponovno pisanje cijele grupe staza. <\/p>\n

Kako bi se podr\u017eali zonirani ure\u0111aji, U XRAID-u je implementiran dodjeljiva\u010d blokova za zonirane ure\u0111aje (zoned allocator), koji koristi RT-podvolumen (RealTime subvolume) za organizaciju odvojenog pohranjivanja podataka i metapodataka (u zonama s sekvencijalnim pisanjem pohranjuje se samo sadr\u017eaj datoteka, dok su metapodatci datote\u010dnog sustava smje\u0161teni u obi\u010dnim zonama ili na dodatnim SSD ure\u0111ajima). <\/p>\n

U XRAID-u se mehanizmi za kontrolu pariteta RAID primjenjuju isklju\u010divo na sadr\u017eaj datoteka, dok se redundancija za metapodatke ostvaruje putem ve\u0107 postoje\u0107ih drajvera u Linux jezgru, na primjer, putem zrcaljenja uz MD RAID, \u0161to je u\u010dinkovitije za male objekte koji se a\u017euriraju na mjestu. Implementacija RAID-a ugra\u0111uje se u XFS do handlera zoniranog ulazno\/izlaznog operativnog sustava, predstavljaju\u0107i fizi\u010dke zone donjih ure\u0111aja u obliku logi\u010dkih zona, sli\u010dno vi\u0161eslojnom bloku.<\/p>\n

Rad na XRAID-u traje ve\u0107 godinu i pol dana, i iako implementacija jo\u0161 nije spremna za integraciju u glavno jezgro, ve\u0107 je pogodna za testiranje \u0161iroke publike. U predlo\u017eenoj implementaciji podr\u017eava se od 0 do 2 razine parnosti (u razvoju je kod za podr\u0161ku 3 i vi\u0161e razina). Za upravljanje XRAID-om dodana je nova alatka «xraid» u alatniku xfsprogs, a realizirana je i podr\u0161ka za XRAID u mkfs. Osim toga, alatu za inspekciju zoniranih ure\u0111aja Zonar dodane su mogu\u0107nosti za vizualizaciju mapiranja logi\u010dkih zona na fizi\u010dke zone.<\/p>\n

Objavljeni su rezultati testiranja performansi XRAID-a u usporedbi s mdraidom i btrfs-om, provedeni za XRAID niz u konfiguraciji od dva SSD-diska WD DC-SN650 za metapodatke (zrcaljenje na temelju mdraida), \u0161est obi\u010dnih SATA diskova WD DC-HC590 26 TB i 6-21 zona diskova WD DC-HC690 30 TB (SMR).<\/p>\n

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Tako\u0111er su provedena testiranja XRAID-a na obi\u010dnim nezoniranim SSD-ovima u konfiguraciji s jednim 4 TiB Samsung PM9D3a za metapodatke i pet 4 TiB Samsung PM9D3a za RAID (4 + 1).<\/p>\n

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Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u0440\u0438\u0441\u0442\u043e\u0444 \u0425\u0435\u043b\u0432\u0438\u0433 (Christoph Hellwig), \u043c\u044d\u0439\u043d\u0442\u0435\u0439\u043d\u0435\u0440 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c DMA, KVM, Slab Allocator \u0438 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b PowerPC \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b \u043f\u0435\u0440\u0432\u044b\u0439 \u043f\u0443\u0431\u043b\u0438\u0447\u043d\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a XRAID, \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u0435\u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e RAID \u0441 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0435\u043c \u0447\u0451\u0442\u043d\u043e\u0441\u0442\u0438, \u0438\u043d\u0442\u0435\u0433\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0432 \u0444\u0430\u0439\u043b\u043e\u0432\u0443\u044e \u0441\u0438\u0441\u0442\u0435\u043c\u0443 XFS. \u041f\u0440\u043e\u0435\u043a\u0442 \u0441\u043e\u0437\u0434\u0430\u043d \u0441 \u0446\u0435\u043b\u044c\u044e \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f RAID \u043d\u0430 \u0437\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f, \u0442\u0430\u043a\u0438\u0445 \u043a\u0430\u043a \u0434\u0438\u0441\u043a\u0438 SMR (Shingled Magnetic Recording), \u0438 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":10,"featured_media":184272,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-184270","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Predstavljen XRAID s implementacijom RAID-a za XFS | ProHoster","description":"Christoph Hellwig, odr\u017eavatelj DMA podsustava, KVM-a, Slab Allocator-a i PowerPC arhitekture u Linux kernelu, predstavio je prvo javno izdanje XRAID-a, implementacije deklasteriziranog RAID-a s 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\u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c DMA, KVM, Slab Allocator \u0438 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b PowerPC \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b \u043f\u0435\u0440\u0432\u044b\u0439 \u043f\u0443\u0431\u043b\u0438\u0447\u043d\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a XRAID, \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u0435\u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e RAID \u0441 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