Re: Fedora F41 Hard Disk Performance

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Stephen Morris wrote:
> > > 40 years ago mainframe storage controllers provided functionality to
> > > control what files were loaded into the storage cache and how much of
> > > the file was loaded, I just thought hard disks had advanced enough to
> > > now provide similar functionality.

Tim:
> > I'm wondering how a storage device is going to know which files to
> > treat differently from other files?  That's going to be OS dependent.
> > 

Stephen Morris:
>  The storage device doesn't, you tell it what to do.

Then why did you think that disc drives had advanced to the point where
they could control what's cached or not?  (Your message on 19 Nov.)

Storage control is an OS-controlled thing through device controller on
your motherboard or daughterboard.  Or, much more likely, completely in
software with the hardware just being a simple interface.

The storage device - the disc drive itself - is a pretty dumb device.

To optimise use of a storage device (to that degree) you'd need to make
OS- and file-system-specific decisions.  That's really outside the
scope of a simple storage device that's used on many (very) different
kinds of systems.  Otherwise, you'd need custom disk drives for each
system.  Generic hardware is just one of the reasons PCs were cheaper
than mainframe equipment.

And yes, your (outside the disc drive) controller could possibly send
commands to the drive about caching priority, and maybe the drive could
do different things, but the decisions would be external.  And I
suspect new bottlenecks would arise. 
 
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