From mboxrd@z Thu Jan 1 00:00:00 1970 From: Justin Bronder Subject: Re: Raid10 device hangs during resync and heavy I/O. Date: Fri, 16 Jul 2010 14:49:22 -0400 Message-ID: <20100716184922.GA25955@gmail.com> References: <20100716184618.GA25890@gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="ibTvN161/egqYuK8" Return-path: Content-Disposition: inline In-Reply-To: <20100716184618.GA25890@gmail.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids --ibTvN161/egqYuK8 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 16/07/10 14:46 -0400, Justin Bronder wrote: > I've been able to reproduce this across a number of machines with the same > hardware configuration. During a raid10 resync, it's possible to hang the > device so that any further I/O operations will also block. This can be > fairly simply done using dd. =20 >=20 > Interestingly, this is not reproducible when using a non-partitioned devi= ce. > That is, creating the device with --auto=3Dyes and then directly using it > functions as expected. However, using --auto=3Dyes or --auto=3Dmdp and t= hen > creating a partition across the device will cause the hang. >=20 > From all appearances, this is not just slow I/O, days later the same tasks > are still blocked. The rest of the system continues to function normally, > including other raid devices. >=20 > Below I'm going to include the script I'm using to reproduce, the relevant > kernel tracebacks, and /proc/mdstat. Thanks in advance for any help > resolving this. My apologies, I should have proof read this first. I've reproduced using 2.6.28, 2.6.32 and 2.6.34.1. --=20 Justin Bronder --ibTvN161/egqYuK8 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.15 (GNU/Linux) iEYEARECAAYFAkxAqbIACgkQ4MrvBE1wQ8nrygCgre4994g+zYv4ZqMTWPPVN1q+ m6EAn12cHTIhmUbeh9wES8sNcb3MCRCr =ZOX1 -----END PGP SIGNATURE----- --ibTvN161/egqYuK8--