<div dir="ltr">JFS, XFS are in "Gen 4" by this nomenclature.<div>UFS2 and FFS/LFS start approaching Gen5 but don't fully integrate volume management like BTRFS and ZFS do. </div><div><br></div><div>It does get kind of fuzzy if you include LVM as part of the "disk management system" as the contemporary systems do.</div><div>While it's not strictly part of the 'file system' it is well part of the overall stack useful for dealing with storage.</div><div><br></div><div>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. </div><div><br></div><div>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.</div><div><br></div><div>chris</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 25, 2019 at 6:16 AM DLWillson <<a href="mailto:DLWillson@thegeek.nu">DLWillson@thegeek.nu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
<div>Where does XFS fit?</div><div><br></div><div id="gmail-m_9183131448359744148composer_signature"><div style="font-size:88%;color:rgb(54,79,103)">David L. Willson</div><div style="font-size:88%;color:rgb(54,79,103)">720-333-LANS</div></div><br><br>-------- Original message --------<br>From: Dennis J Perkins <<a href="mailto:dennisjperkins@comcast.net" target="_blank">dennisjperkins@comcast.net</a>> <br>Date: 3/24/19 9:35 PM (GMT-07:00) <br>To: CLUE's mailing list <<a href="mailto:clue@cluedenver.org" target="_blank">clue@cluedenver.org</a>> <br>Subject: [clue] generations of file systems <br><br>Jim Salter has an interesting article abut this on Ars Technica.<br><br>Generation 0: No system. Just n aritrary stream of data on punchcards,<br>cassettes, tape, etc.<br><br>Generation 1: Early filesystems without directories or metadata. CP/M,<br>Apple DOS, etc.<br><br>Generation 2: Directories added to better handle the amount of storage<br>space on hard drives. MS-DoS 2.0.<br><br>Generation 3: Metadata. Unix, Macintosh.<br><br>Generation 4. Journaling. Ext3, NTFS, etc.<br><br>Generation 5: CoW , built-in volume management, per-block checksums,<br>self-healing arrays. ZFS, Btrfs, ReFS. Maybe Bcachefs and Stratis?<br><br>_______________________________________________<br>clue mailing list: <a href="mailto:clue@cluedenver.org" target="_blank">clue@cluedenver.org</a><br>For information, account preferences, or to unsubscribe see:<br><a href="http://cluedenver.org/mailman/listinfo/clue" target="_blank">http://cluedenver.org/mailman/listinfo/clue</a><br></div>_______________________________________________<br>
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