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A comment on Western Digital admits 2TB-6TB WD Red NAS drives use shingled magnetic recording.

Re:Western Digital admits 2TB-6TB WD Red NAS drives use shin... by mavhc on Wednesday April 15, 2020 @01:50PM (#22880776)
Resilvering isn't random IO though, it's almost perfect for SMR, one continuous write from sector 0 to the end.

I just put a ST8000DM004 8TB drive into my 12 disk raidz2, on zfs 0.8, it took 8 days (so terribly slow 9MB/sec), but no errors resilvering

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Re:Western Digital admits 2TB-6TB WD Red NAS drives use shin... by dcm360 on Wednesday April 15, 2020 @02:48PM (#22881468)
Resilvering on ZFS in not linear, it is quite some random IO.

A ST8000DM004 is capable of linear reads above 200MB/s, and a normal drive should be able to handle the same speeds with linear writes.

I would not recommend those drives for use with ZFS from my own experience: one of my drives disappeared after 1.5TB of writes while moving a dataset, and only went online again (with a SMART failure) after a power cycle.

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Re:Western Digital admits 2TB-6TB WD Red NAS drives use shin... by mavhc on Saturday April 18, 2020 @04:07AM (#22906122)
Isn't that what sequential resilvering in zfs 0.8 means?
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