Date: Wed, 19 Feb 2014 10:36:50 -0800 From: <dteske@FreeBSD.org> To: <dweimer@dweimer.net> Cc: daver@vicor.com, questions@freebsd.org, 'Devin Teske' <devin.teske@fisglobal.com>, freebsd@fongaboo.com, owner-freebsd-questions@freebsd.org, dteske@FreeBSD.org Subject: RE: ZFS on Hardware RAID controller Message-ID: <101701cf2da1$8f47ddb0$add79910$@FreeBSD.org> In-Reply-To: <101101cf2d97$d708e630$851ab290$@FreeBSD.org> References: <alpine.BSF.2.00.1402111550250.5347@helix.wtfayla.net> <CAF6rxgku91Rz037H-rpBCzc9G5bu5=KOiAm1Wms3%2B1Xcz%2BJjtQ@mail.gmail.com> <alpine.BSF.2.00.1402181717580.4903@helix.wtfayla.net> <CAF6rxgkVWm9AbM8SWCA3oHg8DHwSrRbSTW%2Ba%2BE9o%2Bky9SKNc2w@mail.gmail.com> <alpine.BSF.2.00.1402182250080.4903@helix.wtfayla.net> <0fdd01cf2d29$dca0aba0$95e202e0$@FreeBSD.org> <4e4aa28301cedd61cb5693e79a90d0ab@dweimer.net> <0fdf01cf2d34$65d9de00$318d9a00$@FreeBSD.org> <87679f0a7789f01ad66b3c2ae55e3006@dweimer.net> <101101cf2d97$d708e630$851ab290$@FreeBSD.org>
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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 disks. 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".[2] 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. -- Devin _____________ The information contained in this message is proprietary and/or confidential. If you are not the intended recipient, please: (i) delete the message and all copies; (ii) do not disclose, distribute or use the message in any manner; and (iii) notify the sender immediately. In addition, please be aware that any message addressed to our domain is subject to archiving and review by persons other than the intended recipient. Thank you.
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