July 21, 20187 yr First and foremost, I know SMR drives are known to have poor write speeds, but my understanding was that it was smart enough to know if it's writing multiple whole shingled sections (like y'know, writing the entire disk) it would know to just write through, rather than caching etc. I was getting what you'd expect for read speeds, something like 160MB/s, but now in the write phase, it's 12MB/s. Is this because they're going through the USB controller, or are they really that dumb, or....what? Obviously can't be shucking these for my array if they're *that* slow consistently. The idea was to be that it could handle loading large chunks of data without going through the SMR shuffle.
July 21, 20187 yr Community Expert They work fine with sequencial writes, either the enclosure or most likely the preclear which I believe has performance issues on the latest release.
July 21, 20187 yr MMy preclear times for 8TB Seagate SMR drives were nearly identical between external USB3 and internal SATA connections. Something is wrong with the preclear plugin script, going from recent reports.
July 21, 20187 yr Author Well that's not good -- is there any way to install an old version? I'm sure I could let it run, but probably looking like 10+ days... Are we sure there are such severe issues? Any thread on this?
July 21, 20187 yr Author Found my way! This post is the fix: Seems to be a compounding issue that gets worse over time as it's zeroing.
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