From mboxrd@z Thu Jan 1 00:00:00 1970 From: Killian De Volder Subject: Re: block size question Date: Wed, 18 May 2016 17:46:54 +0200 Message-ID: <573C8E6E.8030008@megasoft.be> References: <573C02B3.5010501@net.home> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: Received: from relay5-d.mail.gandi.net ([217.70.183.197]:56922 "EHLO relay5-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932419AbcERPq7 (ORCPT ); Wed, 18 May 2016 11:46:59 -0400 Received: from mfilter38-d.gandi.net (mfilter38-d.gandi.net [217.70.178.169]) by relay5-d.mail.gandi.net (Postfix) with ESMTP id 01E7041C08F for ; Wed, 18 May 2016 17:46:57 +0200 (CEST) Received: from relay5-d.mail.gandi.net ([IPv6:::ffff:217.70.183.197]) by mfilter38-d.gandi.net (mfilter38-d.gandi.net [::ffff:10.0.15.180]) (amavisd-new, port 10024) with ESMTP id C0SHWo-ZifDg for ; Wed, 18 May 2016 17:46:55 +0200 (CEST) Received: from [172.17.0.70] (cable-213-34-255-70.zeelandnet.nl [213.34.255.70]) (Authenticated sender: killian.de.volder@megasoft.be) by relay5-d.mail.gandi.net (Postfix) with ESMTPSA id 47A2D41C09D for ; Wed, 18 May 2016 17:46:55 +0200 (CEST) In-Reply-To: <573C02B3.5010501@net.home> Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: linux-bcache@vger.kernel.org Done some testing for you: The -B --block size has to be a a power2 of -C --block size. (Note: all information is about bcache1 not bcachefs if that is what you are talking about) Killian De Volder On 18-05-16 07:50, Vlad wrote: > Hallo, > > What would be the optimal block size in case if physical block sizes > different for cache and backing devices? Can I use different block sizes > for cache and backing devices, like: > make-bcache --block 4k -B /dev/sdc > make-bcache --block 512 -C /dev/sda > > I have a feeling that the block size should be the same and the biggest > block size should be used, but I'd appreciate any thoughts about that. > > Thanks in advance, > Vlad. > -- > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >