Is multipath essential on Server 20.04?

[Liam Proven]

On Fri, 2 Oct 2020 at 20:50, R C <cjvijf at gmail.com> wrote:
>
> multipath is needed for (optimizing) io when there are virtual storage
> devices that use multiple hardware/actual devices (hence multipath), for
> example when you are using lustre, scality, san, jbod, ZFS or 'any array'
>
> since you are using ZFS, in/on an array, it would be a good idea to use it.
>
> You don't NEED to use it, it only makes io more efficient and probably
> faster.
>
> Also, you can shut down some of the cores on your RPI cpu, you DON'T
> really need those either.

Thanks for the comments.

My impression was that it was for SAN connections -- things like
iSCSI, and maybe Ceph. I don't know much about Lustre/Glustre, and
I've never even heard of Scality before. JBOD? Just a Bunch of Disks?
Really? How so?

ZFS I'm using, yes, which is why I was concerned. If I end up dropping
ZFS then I'll probably replace it with a plain old MDRAID. Both are
multi-device filesystems, so I figured they'd need the kernel
devicemapper, but I don't see why ZFS on a single box that's not
connecting to anything else should need it. How come?

(Obligatory "please bottom-post on the list" comment, too...)


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