Re: File system performance, hardware performance, ext3, 3ware RAID1, etc.

[John Bradford]

> And the software-visible 512-byte blocking factor just has to be
> _incredibly_ painful on a hardware level, and I'd be surprised if there
> aren't disks out there already where the actual real physical block-size
> is bigger. Which means that I would expect a lot of drives to internally
> do read-modify-write cycles for small writes.
> 
> And especially in a market where density is often more important than pure
> speed, I'd expect hw manufacturers to have a _huge_ bias towards big
> blocks on the platter, in order to avoid having to have lots of
> inter-sector gaps etc.

Since drives don't generally do defect re-allocation on read, only on
write, large blocks at the hardware level cause difficulties with
defect management, so hardware 512 byte sectors are still common :-(.

John.
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