Subj : Re: Windows vs Linux
To   : boraxman
From : tenser
Date : Mon Apr 25 2022 05:17:45

On 23 Apr 2022 at 10:00p, boraxman pondered and said...
 
 bo>  Sp> That's a pretty old theory thought... IBM had 32bit systems back in t
 bo>  Sp> 80's in which there was no HD space per se the whole thing was just
 bo>  Sp> addressed as linear memory..I can't give you a model off the top of m
 bo>  Sp> head, but I'm sure I can track one or more down if you like :)
 bo> 
 bo> Was that a memory mapped hard disk?  BTRFS does what lvm does, combine
 bo> disks. With btrfs you can simply make the filesystem span multiple disks
 bo> without having any layer underneath to abstract the partitions/disks.

No.  That sounds like the AS/400, which was (and kind of still
is) a single-level store system, much like Multics.  "Files"
are accessed via memory mapping, but it's very different than
memory-mapped disks.  Think of it as being more analogous to
doing all file access via mmap(), except transparent to you.

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