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Re: Does anybody have anecdotal experience of running 3 OSes (Free/Net/O

From: John Paul Morrison
Subject: Re: Does anybody have anecdotal experience of running 3 OSes (Free/Net/OpenBSD) and share data between them?
Date: Tue, 7 Dec 2021 10:27:44 -0800

Are the guests running at the same time? If they support virtiofs you could share a host folder.

-fsdev local,id=fsdev0,path="${PUBLIC}",security_model=mapped-xattr
-device virtio-9p-pci,fsdev=fsdev0,mount_tag="${PUBLIC_TAG}"

mount -t 9p  ${PUBLIC_TAG}  /mnt

I don't know if 9p handles locking - the host could export NFS if that's a concern.

If you simply need a common filesystem then ZFS is available for Linux and BSD.

For low level partition sharing there's iscsi/nbd, and qemu has iscsi as well - in case you're doing HA/clustering.

On Tue, Dec 7, 2021 at 12:59 AM Ottavio Caruso via <qemu-discuss@nongnu.org> wrote:
I run three instances of qemu (FreeBSD, NetBSD OpenBSD). Host is Linux
Mint. In real life, it would be very hard to share partitions among them
(apart from probably using good old fashioned fat-32).

I wonder if there is a way to share a qemu drive between them while I am
actually running them at the same time. I am resigned to the idea that
it's not possible but if anybody has any experiences/ideas, please share.

Ottavio Caruso

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