From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Anton Mitterer Subject: Re: shown disk sizes Date: Thu, 18 Jul 2013 02:39:39 +0200 Message-ID: <1374107979.5260.21.camel@fermat.scientia.net> References: <1374071867.25339.14.camel@heisenberg.scientia.net> <20130718094327.7d46949e@notabene.brown> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-JDNk5qnmSi6Nn+VeRoKy" Return-path: In-Reply-To: <20130718094327.7d46949e@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids --=-JDNk5qnmSi6Nn+VeRoKy Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2013-07-18 at 09:43 +1000, NeilBrown wrote: > Yes - this mailing list. > The protocol is that as long as you care about the issue and haven't had > satisfactory response, you post a "Can anyone help with this" every week = or > so. > That way we don't have a problem with lots of stale entries that no-one c= ares > about. okay... guess I need to track my ideas for additions to the documentation (like the ones below) somewhere else than... =3D) > chunksize is not very meaningful for RAID1. If you add '-v' mdadm should > tell you: > mdadm: chunk size ignored for this level Yeah... sure... I just made some tests and re-used the history from a previous raid6 and didn't remove the useless stuff ;) > Maybe it should round the size down to a multiple of the given chunk size= , > but as you said "--size=3Dmax", maybe not.. Not sure. Interesting question... I'll try that later... maybe something we can add to the manpage as well. > > =3D> Why is the array size / used dev size smaller? >=20 > Good question. Not easy to answer ... it is rather convoluted. Differen= t > bits of code try to reserve space for things differently and they don't e= nd > up agreeing. I might try to simplify that. Okay... I have no idea what you're talking about ;-) It seems to it's always 144 sectors that are "missing"... What do you mean by simplify? > > --detail gives: > > Array Size : 10484664 (10.00 GiB 10.74 GB) > > Used Dev Size : 10484664 (10.00 GiB 10.74 GB) > >=20 > > =3D> That's half of the Array Size from above? Is that a bug? > The number is in K rather than sectors. Sorry :-( You know that these are the reasons why kernel developers may end up in hell?! ;-P okay... I guess again something for the documentation... or would you see a problem to change the output to at least include the unit? Like=20 Array Size (KiB) or so? > Would that really help? Given that 10.00GiB is not exactly the same as > 10.74GB, isn't it obvious that they must be approximations? >=20 > I'm not exactly against adding '~' but it doesn't seem necessary. > Does anyone else have thoughts? I don't think it's strictly necessary as well... but I guess it would be cleaner... 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