[clue] generations of file systems

[Chris Fedde]

JFS, XFS are in "Gen 4" by this nomenclature.
UFS2 and FFS/LFS start approaching Gen5 but don't fully integrate volume
management like BTRFS and ZFS do.

It does get kind of fuzzy if you include LVM as part of the "disk
management system" as the contemporary systems do.
While it's not strictly part of the 'file system' it is well part of the
overall stack useful for dealing with storage.

Advanced disk controllers can blur the lines even further.    One of the
hardest things I've see junior and even some senior admins (aka devops
engineers) work through is all the layering that goes into a modern server
technology stack and that's before we get into distributed disk access and
network file systems, virtualization, containerization and cloud.

I know that there are zeros and ones somewhere down near the bottom but I'm
not sure I can keep all of it straight any more.

chris

On Mon, Mar 25, 2019 at 6:16 AM DLWillson <DLWillson at thegeek.nu> wrote:

> Where does XFS fit?
>
> David L. Willson
> 720-333-LANS
>
>
> -------- Original message --------
> From: Dennis J Perkins <dennisjperkins at comcast.net>
> Date: 3/24/19 9:35 PM (GMT-07:00)
> To: CLUE's mailing list <clue at cluedenver.org>
> Subject: [clue] generations of file systems
>
> Jim Salter has an interesting article abut this on Ars Technica.
>
> Generation 0: No system.  Just n aritrary stream of data on punchcards,
> cassettes, tape, etc.
>
> Generation 1: Early filesystems without directories or metadata.  CP/M,
> Apple DOS, etc.
>
> Generation 2: Directories added to better handle the amount of storage
> space on hard drives.  MS-DoS 2.0.
>
> Generation 3: Metadata.  Unix, Macintosh.
>
> Generation 4.  Journaling.  Ext3, NTFS, etc.
>
> Generation 5: CoW , built-in volume management, per-block checksums,
> self-healing arrays.  ZFS, Btrfs, ReFS.  Maybe Bcachefs and Stratis?
>
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