ZFS on Hardware RAID controller
freebsd at fongaboo.com
freebsd at fongaboo.com
Sat Feb 22 20:19:54 UTC 2014
So I think it's fair to say that there is some ambiguous information out
there about the definition of JBOD.
So, without worrying about settling the discrepency over nomenclature, is
it fair to say that...
If I am planning to use ZFS on a machine where the drive controller
happens to be one that can be configured for some combination of HARDWARE
I should configure it so that it does not concatenate/span/combine the
drives in any way at the hardware level.
I need to configure it as if it wasn't even a RAID controller, but rather
in a configuration where the motherboard/filesystem/OS will initially see
each physical drive as its own volume.
On Wed, 19 Feb 2014, dteske at FreeBSD.org wrote:
> Re: JBOD...
> I think it's very telling that when Google gives you
> the description of JBOD, it actually comes from the
> Wikipedia, but ... it doesn't include the [misleading]
> statement about the [optional] act of joining the
> Google's Definition:
> Just a Bunch Of Disks. A collection of hard disks that
> aren't configured according to RAID; A hard disk
> enclosure for several disks, especially one lacking a
> RAID controller
> Source: http://en.wiktionary.org/wiki/JBOD
> Definition from
> JBOD (abbreviated from "just a bunch of disks") is an
> architecture using multiple hard drives, but not in a
> RAID configuration, thus providing neither redundancy
> nor performance improvements. Hard drives *may be*
> handled independently as separate logical volumes, or
> they *may be* combined into a single logical volume
> using a volume manager like LVM; such [optionally
> combined] volumes are usually called "spanned".
> I added the *'s around "may be" and also added the
> "[optionally combined]" texts to help clarify that for
> you. And I would go on to further say that the LVM
> volume manager used to combine the JBOD-access
> devices is not part of nor has any relation to said
> JBOD access. JBOD is a means of exporting the disks
> to the volume manager whose use is optional.
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