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June 8, 2020 03:25 pm

Western Digital's SMR Disks Won't Work For ZFS, But They're Okay For Most NASes.

An anonymous reader shares a report: Western Digital has been receiving a storm of bad press -- and even lawsuits -- concerning their attempt to sneak SMR disk technology into their "Red" line of NAS disks. To get a better handle on the situation, ArsTechnica purchased a Western Digital 4TB Red EFAX model SMR drive and put it to the test ourselves. [...] Recently, the well-known tech enthusiast site Servethehome tested one of the SMR-based 4TB Red disks with ZFS and found it sorely lacking. The disk performed adequately -- if underwhelmingly -- in generic performance tests. But when Servethehome used it to replace a disk in a degraded RAIDz1 vdev, it required more than nine days to complete the operation -- when all competing NAS drives performed the same task in around sixteen hours. [...] We want to be very clear: we agree with Seagate's Greg Belloni, who stated on the company's behalf that they "do not recommend SMR for NAS applications." At absolute best, SMR disks underperform significantly in comparison to CMR disks; at their worst, they can fall flat on their face so badly that they may be mistakenly detected as failed hardware. With that said, we can see why Western Digital believed, after what we assume was a considerable amount of laboratory testing, that their disks would be "OK" for typical NAS usage. Although obviously slower than their Ironwolf competitors, they performed adequately both for conventional RAID rebuilds and for typical day-to-day NAS file-sharing workloads. We were genuinely impressed with how well the firmware adapted itself to most workloads -- this is a clear example of RFC 1925 2.(3) in action, but the thrust does appear sufficient to the purpose. Unfortunately, it would appear that Western Digital did not test ZFS, which a substantial minority of their customer base depends upon.

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