From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: Is it possible to grow a (far) RAID 10? Date: Wed, 26 Nov 2014 08:19:15 +1100 Message-ID: <20141126081915.58d7fa71@notabene.brown> References: <54744AEE.10908@aei.mpg.de> <81fe7d20d731393c86a6ca557d71adaa@kruemel.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; boundary="Sig_/cuBC/rN7l_lpgKVy=Z2sEQ/"; protocol="application/pgp-signature" Return-path: In-Reply-To: <81fe7d20d731393c86a6ca557d71adaa@kruemel.org> Sender: linux-raid-owner@vger.kernel.org To: cvb@kruemel.org Cc: Carsten Aulbert , linux RAID , linux-raid-owner@vger.kernel.org List-Id: linux-raid.ids --Sig_/cuBC/rN7l_lpgKVy=Z2sEQ/ Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Tue, 25 Nov 2014 12:01:58 +0100 cvb@kruemel.org wrote: > Hi >=20 > Am 2014-11-25 10:25, schrieb Carsten Aulbert: > > Without much thinking, I would simply follow the wiki page, mark a > > device as failed, remove it, repartition it, add it again, and wait > > for sync to complete. Repeat for all 4 devices and finally --grow with > > mdadm (followed by xfs resizing) - and of course, all online, while > > machine is in flight. >=20 > That is exactoy what I did with my RAID 10 a bit more than a year ago.=20 > It basically worked, but there was one caveat... some part (the=20 > ---grow?) which required a certain kernel version for which I had booted= =20 > a live CD back then... >=20 > The thing is, I can't exactly remember what the caveat was. And as I'm=20 > about to grow the RAID again (having replaced all hard drives already),=20 > I have been looking for the related mails in the archive of this list,=20 > but I can't seem to find them... >=20 > So I guess we'll have to hope that Neil replies again. I recommend creating some loop-back block devices and experimenting. But I'm fairly sure that "far" RAID10 arrays cannot be reshaped at all. NeilBrown --Sig_/cuBC/rN7l_lpgKVy=Z2sEQ/ Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIVAwUBVHTyUznsnt1WYoG5AQIlwBAAp4uQo8XqteGTGceU7WbSHdEWJe361PKT K4MjbQIBiS+ke4JPR9IkA1oyrgMXjLqLdfLfs++kY2fuexcNcuXMNlIPkVV7y60Z dpdcADGJCbuRvzcbA2BgGCSQJEAigTQvyEqGjN8lZblqz/VepfI7xANEx7okBWpX 1K4olJo9lCoKJxRLVZEKFWzR+4KbjY5YGkmO/xOnNfMdK07XyNenAIHGR0Mk70PV GZpFM9Z5lKystBD6yxL3fy/H6ErlWpDdSeOemZaPtM1N+OxphdCbLknWKXJmWlFF 4aUYGx69SXJaaTDjZrVRmdY59AuCT5cTItXdGk0zmn6f67PEF/TiWyC7dEmGaGWZ Sh2dpTp+Qrf6VEbC5Ok4QxnwsNvLXTFT95CUApQiq6ePa2e0125NjOdkGdzngm1D 5BQPv+sHd664FG1P5r+syLXBkiy5ecd3FLOqiTr6x13Xeywk/ha65HcTn0J2l7K7 6/GwyAwa7VoUCVX1x6jAZU6ePRdMb4NesUUN7Uap1IQub1T+IpqevSfgco/5U+Gu 0m+NZOi+ybA0tdY+a71XzDP/QAyjAr2KEQzxX805vB9+H/HDrDGoStazBhnKnNEp xkazyoA3EthKODgIxq+3anAwG4ao+1dthJXeeEGJekQLtbQaiga/0cxqenFMyNbA gYrxC/uJoRw= =ikvM -----END PGP SIGNATURE----- --Sig_/cuBC/rN7l_lpgKVy=Z2sEQ/--