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Host Aware, HA-SMR, which is designed to give ZFS insight into the SMR process. Note that ZFS code to use HA-SMR does not appear to exist. Without that code, a HA-SMR drive behaves like a DM-SMR drive where ZFS is concerned. HGST Host-Managed SMR DataCenter drives: https://www.westerndigital.com/products/data-center-drives/ultrastar-dc-hc600-series-hdd |WD data sheet for WD Red, note 256MB cache suggesting DM-SMR: https://documents.westerndigital.co...et-western-digital-wd-red-hdd-2879-800002.pdf
Seagate presents the BarraCuda, an extremely versatile and reliable HDD storage device that provides ample space for all types of files. Ideally, the disk can be used in laptops, mobile storage, external storage systems, all-in-one PCs, or ultra-thin desktop PCs. Especially useful is the multi-tier caching technology used, which allows applications and files to load faster than ever from the HDD. Responsible for this are intelligent NAND flash levels, DRAM and media cache technologies, which optimize the data flow and improve the reading and writing performance. When it comes to data recovery one of the most common problems Seagate ST2000LM015 Hard Disk Drive experience is burnt circuit board(PCB). So if you will need to match a replacement PCB, it is important that you note the “ Board Number” of your current circuit board in addition to the hard drive’s “ Model Number“. WD platter sizes 2.5": https://rml527.blogspot.com/2010/10/hdd-platter-database-western-digital-25.html l) OpenZFS Office Hour discussion on SMR: 2015, SMR, Resilvering, Possible Solutions at around 20, 31 and 46 mins respectively, https://youtu.be/mS4bfbEq46I?t=1220 n) HiSMRFs research file system for SMR: 2014, https://www.researchgate.net/public...rmance_file_system_for_shingled_storage_arrayThe BarraCuda is very economical, compact, quiet and at the same time extremely fast, even in comparison with many HDDs from other manufacturers. WD platter sizes niche products: https://rml527.blogspot.com/2010/10/hdd-platter-database-western-digital-35.html j) BPR is so complex no new features can be added afterwards: 2020, BSD Now podcast, from roughly 22:00, https://www.bsdnow.tv/340 Toshiba's list of DM-SMR drives: https://toshiba.semicon-storage.com/ap-en/company/news/news-topics/2020/04/storage-20200428-1.html q) Toshiba presentation on SMR technology: 2015, https://www.toshiba.co.jp/tech/review/en/01_02/pdf/a08.pdf
a) HA-SMR and HM-SMR in ZFS: 2014, Tim Feldman of Seagate, http://open-zfs.org/w/images/2/2a/Host-Aware_SMR-Tim_Feldman.pdf While the vast majority of the Seagate BarraCuda 2.5" 4 TB HDDs will use a four-platter configuration, some Seagate customers have apparently requested a five-platter configuration. Obviously, being based on 800 GB platters, such drives have lower areal density and, perhaps, different performance and behavior. Seagate is a real industry giant in the hard drive market, where you can barely get past if you want to build a high-memory PC system. The range of models covers all segments - from small (2.5 inches) to large (3.5 inches), from green IT (at lower speeds) to high-speed (at 7,200 rpm), from home users to professional environment.SMR has worse sustained write performance than CMR, which can cause severe issues during resilver or other write-intensive operations, up to and including failure of that resilver. It is often desirable to choose a CMR drive instead. This thread attempts to pull together known SMR drives, and the sources for that information. WD platter sizes: https://rml527.blogspot.com/2010/10/hdd-platter-database-western-digital-35_9883.html Seagate data sheet for DM-SMR Archive drives: https://www.seagate.com/www-content...dd/en-us/docs/archive-hdd-dS1834-3-1411us.pdf p) Manylogs concept, platters would need SMR and CMR sides: 2016, IEEE, https://ieeexplore.ieee.org/document/7897075
Anandtech lists Seagate 2.5" Barracuda as SMR: https://www.anandtech.com/show/1075...5-mobile-hard-drives-with-up-to-5-tb-capacity All 2-6TB external drives - Elements, My Book, Easystore, etc. Precise models vary and are not guaranteed; assume SMR in capacities below 8TB. WD platter sizes 2.5 niche products: https://rml527.blogspot.com/2010/10/hdd-platter-database-western-digital-25_2393.htmlST2000LM015 Seagate 2.5″ hard drive with a storage capacity of 2TB and featuring a SATA interface. ST2000LM015 Seagate BarraCuda Pro 2TB 5400RPM SATA 6Gb/s 128MB Cache 2.5-inch Hard Drive. Seagate has formally introduced a new family of hard drives in the 2.5” form-factor. It is designed for laptops as well as external storage solutions. The new BarraCuda HDDs are based on 1 TB shingled magnetic recording platters and Seagate’s multi-tier caching technology. They enhance the maximum capacity of the company’s 2.5” HDDs to 5 TB - making the BarraCudaST5000LM000 the world’s highest-capacity 2.5” hard drive. Seagate platter sizes 2.5": https://rml527.blogspot.com/2010/09/hdd-platter-database-seagate-25.html SMR allows vendors to offer higher capacity without the need to fundamentally change the underlying recording technology.
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