From mboxrd@z Thu Jan 1 00:00:00 1970 From: Loic Dachary Subject: Re: [ceph-users] Running on disks that lose their head Date: Thu, 07 Nov 2013 00:41:52 +0800 Message-ID: <527A7150.70901@dachary.org> References: <52798E1D.9090807@dachary.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="pJM4xsobU8md2x31v3fG4rJkmgpGuXDJ2" Return-path: Received: from smtp.dmail.dachary.org ([91.121.254.229]:57404 "EHLO smtp.dmail.dachary.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755069Ab3KFQl6 (ORCPT ); Wed, 6 Nov 2013 11:41:58 -0500 In-Reply-To: <52798E1D.9090807@dachary.org> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Ceph Development , ceph-users This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --pJM4xsobU8md2x31v3fG4rJkmgpGuXDJ2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable An anonymous kernel developer sends this link: http://en.wikipedia.org/wiki/Error_recovery_control On 06/11/2013 08:32, Loic Dachary wrote: > Hi Ceph, >=20 > People from Western Digital suggested ways to better take advantage of = the disk error reporting. They gave two examples that struck my imaginati= on. First there are errors that look like the disk is dying ( read / writ= e failures ) but it's only a transient problem and the driver should be a= ble to make the difference by properly interpreting the available informa= tion. They said that the prolonged life you get if you don't decommission= a disk that only has a transient error is significant. The second exampl= e is when one head out of ten fails : disks can keep working with the nin= e remaining heads. Losing 1/10 of the disk is likely to result in a full = re-install of the Ceph osd. But, again, the disk could keep going after t= hat, with 9/10 of its original capacity. And Ceph is good at handling osd= failures. >=20 > All this is news to me and sounds really cool. But I'm sure there are p= eople who already know about it and I'm eager to hear their opinion :-) >=20 > Cheers >=20 >=20 >=20 > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >=20 --=20 Lo=EFc Dachary, Artisan Logiciel Libre --pJM4xsobU8md2x31v3fG4rJkmgpGuXDJ2 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.20 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlJ6cVAACgkQ8dLMyEl6F23LHQCeIFD9tT7T/3BLzhzM+0RhQInE GREAn33UUKPv6hF6heaTs+FwjTNdL0Un =iBEV -----END PGP SIGNATURE----- --pJM4xsobU8md2x31v3fG4rJkmgpGuXDJ2--