From mboxrd@z Thu Jan 1 00:00:00 1970 From: Loic Dachary Subject: Re: osd pool erasure code stripe width Date: Sat, 20 Jun 2015 00:47:19 +0200 Message-ID: <55849BF7.5050603@dachary.org> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="UFD1jCT54npw7Vav98nrprhk4ecHgChnU" Return-path: Received: from mail2.dachary.org ([91.121.57.175]:37197 "EHLO smtp.dmail.dachary.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753917AbbFSWrW (ORCPT ); Fri, 19 Jun 2015 18:47:22 -0400 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: "Deneau, Tom" , ceph-devel This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --UFD1jCT54npw7Vav98nrprhk4ecHgChnU Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Tom, A stripe width of 4KB (the default) means the object is encoded 4KB at a = time. It does not show in the file written to disk. Cheers On 19/06/2015 22:11, Deneau, Tom wrote: > I am trying to understand the use of "osd pool erasure code stripe widt= h" > For example, I have a single-node system with a k=3D2,m=3D1 ec pool > and I write a single 40M object to this pool using rados bench. > But when I look on the disk, I still see only the 3 20M pieces for this= object. > Where does the striping get used? >=20 > -- Tom Deneau, AMD >=20 >=20 > Description: > Sets the desired size, in bytes, of an object stripe on every erasure c= oded pools. Every object if size S will be stored as N stripes and each s= tripe will be encoded/decoded individually. > Type: > Unsigned 32-bit Integer > Default: > 4096 >=20 >=20 > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n >=20 --=20 Lo=EFc Dachary, Artisan Logiciel Libre --UFD1jCT54npw7Vav98nrprhk4ecHgChnU Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iEYEARECAAYFAlWEm/cACgkQ8dLMyEl6F23u0gCfcJBWpQdswsRGc7v+2HabnFuU YmIAnjBom7srq8QHyzAcBbSTqGKYe+yM =/sgf -----END PGP SIGNATURE----- --UFD1jCT54npw7Vav98nrprhk4ecHgChnU-- -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in