Linux LVM on Openbsd?
reddit / BSD

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Icedcool · 2019-07-04 15:30

I'm considering changing my server to OpenBSD, although I have a
storage of 3 hd's created as a ext4 lvm. Can I mount these drives with
Openbsd, or do I have to stick with linux to use it?

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set-eirc · 2019-07-04 15:56

I think that bsd does not have support to lvm. You probably will need
to rebuild your partition tables..

I would do it anyway :)

Edit: it was a Lil joke (sry for that) AND I am wrong, NetBSD does
have support. See comments

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Nanosleep · 2019-07-04 16:24

>Can I mount these drives with Openbsd

It's not naively supported. I think you're going to end up shuffling
data around one way or the other. It *might* be possible to pass
through some raw block devices to a linux vm running under vmm since
it supports raw disks (at which point you could at least transfer your
data off to another volume), but I have a feeling that 'raw disks'
really just means a dd dump on an openbsd filesystem and you can't
actually specify /dev/sdX, etc. Although, I'd imagine features like
that aren't too far out.

And for what it's worth, storage isn't exactly OpenBSD's strongest
suit... It's fine for cold storage (FFS has a great track record for
data integrity), but it definitely wouldn't be anywhere near the top
of the "platforms that make a high-performance / versatile NAS" list.

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illumosguy · 2019-07-04 19:03

> I think that bsd does not have support to lvm

you think wrong, [NetBSD
does](https://www.netbsd.org/docs/guide/en/chap-lvm.html) ;)

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set-eirc · 2019-07-04 19:12

Oh nice, thanks for that

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illumosguy · 2019-07-04 19:24

NetBSD has support for LVM, it just works, but it forked from Red
Hat's years ago, so I wouldn't be surprised  if either NetBSD's
version were outdated and/or the 2 implementations had become
incompatible with each other im the meantime. Personally I've never
used LVM on Linux, and only briefly on Net

While many FSs on NetBSD can be mounted r/w in userpace by relying on
[PUFFS](https://en.m.wikipedia.org/wiki/PUFFS_(NetBSD\)) and using
FUSE as software frontend, the only solution available for ext4,
[ext4fuse](https://github.com/gerard/ext4fuse) still **doesn't**
provide write support.

To sum up: you would most likely avoid wasting time and do yourself a
favor by rsyncing those LVM volumes to FFSv2/LFS drives.

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HelperBot_ · 2019-07-04 19:25

Desktop link: https://en.wikipedia.org/wiki/PUFFS_(NetBSD)
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Icedcool · 2019-07-05 03:28

Thank you everyone for the responses. :) Looks like I may have a nas
as a linux box, and an openbsd as my network services box.

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ReachTheZenith · 2019-07-05 16:31

What about https://github.com/alperakcan/fuse-ext2?
It has experimental write support.

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PitifulView · 2019-07-06 09:51

netbsd has ext4 write support

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illumosguy · 2019-07-07 13:09

that's really good to hear, I regret stating otherwise then, would you
you mind linking some reference?