> Neither of these points is relevant in the case posited by the OP. She's
> writing directly to the drive, not to some file. There is no question of
> random versus sequential and there's no filesystem block allocation
> going on.
>
As you may have guessed, I failed to notice that she using dd directly to sdX instead of file.
My mistake.
As for RAW vs ext4/LVM, I completely disagree (I did not mention that MD stripe size LVM block size), but this is more-or-less OT for the subject at hand.
- Gilboa
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