From mboxrd@z Thu Jan 1 00:00:00 1970 From: Loic Dachary Subject: Running on disks that lose their head Date: Wed, 06 Nov 2013 08:32:29 +0800 Message-ID: <52798E1D.9090807@dachary.org> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0276280618==" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ceph-users-bounces-idqoXFIVOFJgJs9I8MT0rw@public.gmane.org Sender: ceph-users-bounces-idqoXFIVOFJgJs9I8MT0rw@public.gmane.org To: Ceph Development , ceph-users List-Id: ceph-devel.vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============0276280618== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="lmcAITC30F70flkIOG12wmQfi922jCbOg" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --lmcAITC30F70flkIOG12wmQfi922jCbOg Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Ceph, People from Western Digital suggested ways to better take advantage of th= e disk error reporting. They gave two examples that struck my imagination= =2E 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. All this is news to me and sounds really cool. But I'm sure there are peo= ple who already know about it and I'm eager to hear their opinion :-) Cheers --=20 Lo=EFc Dachary, Artisan Logiciel Libre --lmcAITC30F70flkIOG12wmQfi922jCbOg 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/ iEUEARECAAYFAlJ5jh0ACgkQ8dLMyEl6F210bQCY0jmiTY0sTWIOG6ZsYirT8YA6 zACeLSGVU8/pMS+qvYucCygY9UrEYyI= =RFWX -----END PGP SIGNATURE----- --lmcAITC30F70flkIOG12wmQfi922jCbOg-- --===============0276280618== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ ceph-users mailing list ceph-users-idqoXFIVOFJgJs9I8MT0rw@public.gmane.org http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com --===============0276280618==--