PSA PSA PSA: if you use LVM with USB drives you will get absolutely *abysmal* performance by default (especially on HDDs). You must use `pvcreate --dataalignment 2048s` to fix it. Fix requires re-creating PV and copying all data.
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but what if it's in a (properly aligned) partition?
The partition is properly aligned. The problem is LVM *de* aligns it. I guess if your partition is misaligned in the *other* direction it might work...
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wait what
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