Dragonfly BSD

dragonflybsd.org

31 points·neuromanser··5 comments

For a small (vs. the other BSDs) development group, it has some impressive features.[0]

High SMP/NUMA friendly Scaling and the The HAMMER2 Filesystem[1] in particular is an Atomic COW[2].

[0] https://www.dragonflybsd.org/features/ [1] https://www.dragonflybsd.org/hammer/ [2] https://arstechnica.com/information-technology/2014/01/bitro...

The impulse for submitting this was seeing two submissions for unrelated projects called Dragonfly, possibly DragonflyThisOrThat. I'm not even claiming this one is the OG. But we need as much plurality in the OS department as we can get, and these ppl deserve every bit they can get.

I took a look at it.

https://www.theregister.com/2023/01/06/dragonfly_bsd_6_4/

DragonflyBSD is one of the few BSD distributions which support device-mapper. https://man.dragonflybsd.org/?command=dm_target_crypt&sectio...

Quite useful to mount PS3 disks, to recover old savegames ;) https://www.psdevwiki.com/ps3/Mounting_HDD_on_PC

Interesting,

"The device-mapper disk driver first appeared in NetBSD 6.0. It was then brought into DragonFly 2.7 by Alex Hornung." [0][1]

Don't know about NetBSD and Crypto-DM, but

"DragonFly has a device mapper target called dm_target_crypt(4) (compatible with Linux's dm-crypt) that provides transparent disk encryption. It makes best use of available cryptographic hardware, as well as multi-processor software crypto.

DragonFly fully supports LUKS (cryptsetup(8)) and TrueCrypt as disk encryption methods. tcplay(8), is a free (BSD-licensed) 100% compatible TrueCrypt implementation built on dm_target_crypt(4)." [2]

[0] https://man.netbsd.org/dm.4 [1] https://man.dragonflybsd.org/?command=dm&section=4 [2] https://www.dragonflybsd.org/features/#index6h2

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