From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from frost.carfax.org.uk ([85.119.82.111]:58370 "EHLO frost.carfax.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759503AbcAKQBS (ORCPT ); Mon, 11 Jan 2016 11:01:18 -0500 Date: Mon, 11 Jan 2016 16:01:06 +0000 From: Hugo Mills To: Christoph Anton Mitterer Cc: Sanidhya Solanki , Qu Wenruo , David Sterba , jbacik@fb.com, linux-btrfs@vger.kernel.org Subject: Re: [PATCH] BTRFS: Adds an option to select RAID Stripe size Message-ID: <20160111160106.GB422@carfax.org.uk> References: <1451360528.7094.7.camel@scientia.net> <20151228190336.59a3f440@gmail.com> <1451363188.7094.23.camel@scientia.net> <20151229180643.GD4227@twin.jikos.cz> <20160102065207.4eec760a@gmail.com> <56887B40.10105@gmx.com> <20160109221105.6b18fb8e@gmail.com> <1452527015.7801.1.camel@scientia.net> <20160111064956.573ec21b@gmail.com> <1452527868.7801.2.camel@scientia.net> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="FkmkrVfFsRoUs1wW" In-Reply-To: <1452527868.7801.2.camel@scientia.net> Sender: linux-btrfs-owner@vger.kernel.org List-ID: --FkmkrVfFsRoUs1wW Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jan 11, 2016 at 04:57:48PM +0100, Christoph Anton Mitterer wrote: > On Mon, 2016-01-11 at 06:49 -0500, Sanidhya Solanki wrote: > > I considered that, but, if you read the specification of modern HDDs > > carefully, it states that they are 4K or 512e sector size compatible, > > hence the concession. Also, older drive users may find this > > preferable. > But these are powers of 2,... why does one need=A0768, 3072, 6144, etc.? If you're going to align with erase blocks on SSDs, some SSDs have the erase block size as 3*2^n. (I don't know if that would be useful, but it might be.) Hugo. --=20 Hugo Mills | Unix: For controlling fungal diseases in crops hugo@... carfax.org.uk | http://carfax.org.uk/ | PGP: E2AB1DE4 | --FkmkrVfFsRoUs1wW Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJWk9HCAAoJEFheFHXiqx3kEmIQAK4jKXNO7V6Iz0vubjwMqvX4 jQbjvvZy2q0Bc98/aKsNBaRLJEywvvjymMH1XPpV6ig3T5sOIuqy2pDIKNTPXqrM 0p7QI8WGREjEIcz3VqyxxBrdxqCYLbyZrs2a/itlmEAbniX5YOxRPmDjWPxZaJB/ NghqGBQ1DPKnBFn1M6Z1YBMVbfM1uo8Q3lX1Aq2/9xN5TWJBzUMvhgQukroEkUUr UP9EOReeaPU0HYd0dh2+haP2QNiw3kyaC5pNfyrWmf8D9wqmufmRkVCq53+Gotk3 LT8dD6f3+RGgoVlZjTiQ2cVFjH+FMopK/pJrWXDo2+X4WYmx6mzDc/Qm6OayRMEP wX2xlecOJEizT1HMzRkjgmNfLRRm9g4GLMXzS6PDIyEKcmAIWcsRvZR1WlhPGh0j fl/rhH5CsY5EI1tTgDDL1mF75Hthwayi0JFXft6B21O7WjAVTflpyoR1WsF5l/k+ ikBxZUSbIV9rfhPdbDQ9vE7krs85hhFyCegYGdHc5EkjSPm24uDMjYiu46efCuuj NCZwvbAnfEtZbLJZ7bHCRwdupWyeuXOyQuIx9IkoVQ+xilOydOQxk5QAhQAR/0TJ EUwZFtI6zLVcHKhdhbVRXXz3nkcqfsUv5EGhwUQSMu+9fFtnMqDxgJH61Ws0CAxA Lfjtvvh4meZb6g7KiAUp =Dp3g -----END PGP SIGNATURE----- --FkmkrVfFsRoUs1wW--