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. -- uname -rsvp Linux 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64 Boilerplate: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the mailing list. -- _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
