From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Anton Mitterer Subject: Re: shown disk sizes Date: Wed, 24 Jul 2013 00:10:31 +0200 Message-ID: <1374617431.5348.21.camel@fermat.scientia.net> References: <1374071867.25339.14.camel@heisenberg.scientia.net> <20130718094327.7d46949e@notabene.brown> <1374596770.8463.23.camel@heisenberg.scientia.net> <1374600126.8463.24.camel@heisenberg.scientia.net> <20130724065723.3a0d52b3@notabene.brown> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-qDiZc8Ot25eUcWIupPgd" Return-path: In-Reply-To: <20130724065723.3a0d52b3@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids --=-qDiZc8Ot25eUcWIupPgd Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2013-07-24 at 06:57 +1000, NeilBrown wrote: > New feature in 3.3 is that when you reshape (e.g.) a RAID5 to a RAID6 it = can > do so without using a "backup file" - which is are a pain to work with an= d > slow things down a lot. > What it does instead is move the "data_offset" towards the start of the > device. That way it is never writing onto live data, and so no backup is > needed. So you are stealing my precious space, which I was paying soo much money for?! ;-) Seriously,... sounds like a good idea... :) But why does it also increase the "gap" at the end? Guess the whole "gap" at the end thingy is something we will never ever really get rid of, will we? I mean it's no problem because of some missing sectors... it just makes like more complicated when doing manual geometry calculations... While talking about data_offset... is it planned to implement a way to add a way to specify the data_offset manually and/or specify a data_offset_offset (i.e. a additional offset to what mdadm would have autodetected... similar as LVM allows? I mean the practical relevance is probably not that much... but manual specification would probably needed whenever you have some more complex block layer (e.g. LVM), another MD or a hardware RAID below MD... and you want to align to the stripes... or unusual large chunk sizes... I've seen that you have some branch where you can specify the offset for each device... but... guess that was only for some guys to do recovery works?! Thanks, Chris. --=-qDiZc8Ot25eUcWIupPgd Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIQ/jCCBXUw ggNdoAMCAQICAwEBgjANBgkqhkiG9w0BAQUFADBUMRQwEgYDVQQKEwtDQWNlcnQgSW5jLjEeMBwG A1UECxMVaHR0cDovL3d3dy5DQWNlcnQub3JnMRwwGgYDVQQDExNDQWNlcnQgQ2xhc3MgMyBSb290 MB4XDTEyMDcyMzE0NTY0NVoXDTE0MDcyMzE0NTY0NVowfDEhMB8GA1UEAxMYQ2hyaXN0b3BoIEFu dG9uIE1pdHRlcmVyMSQwIgYJKoZIhvcNAQkBFhVjYWxlc3R5b0BzY2llbnRpYS5uZXQxMTAvBgkq hkiG9w0BCQEWIm1haWxAY2hyaXN0b3BoLmFudG9uLm1pdHRlcmVyLm5hbWUwggEiMA0GCSqGSIb3 DQEBAQUAA4IBDwAwggEKAoIBAQCq/4X3Urm/IHCIYUyqPrBN6FZ2pmd8V5epPyDlveqtdYvLBLNy gP3G3KhGoCA4Jf49KYGmbqk+F7fVWcG1zcdwEx7itKJyj39nYf2HWXogxUSfKFptbOgpsTcEWuxg ka2EkJuErTvYbwCEKT7mn4v6ScuFBc3Q+Hswlt1jbqjczi+OxcU1skvxM5jGjzRwYPUsiHZJRkWp ogbbhNWZNbwXiMPln380TAlryRAr5UE0dSe1dg1qHhF6HSNKwaer0+Dcd/goL4XQhHxCAGZKfCK0 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