From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out5-smtp.messagingengine.com ([66.111.4.29]:50950 "EHLO out5-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755083AbcBJEIm convert rfc822-to-8bit (ORCPT ); Tue, 9 Feb 2016 23:08:42 -0500 Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.nyi.internal (Postfix) with ESMTP id D0B6A21AFE for ; Tue, 9 Feb 2016 23:08:41 -0500 (EST) Received: from ebox.rath.org (ebox.rath.org [45.79.69.51]) by mail.messagingengine.com (Postfix) with ESMTPA id 8816E6800F1 for ; Tue, 9 Feb 2016 23:08:41 -0500 (EST) Received: from vostro.rath.org (vostro [192.168.12.4]) by ebox.rath.org (Postfix) with ESMTPS id B6B5D1CF581 for ; Wed, 10 Feb 2016 04:08:40 +0000 (UTC) From: Nikolaus Rath To: linux-btrfs@vger.kernel.org Subject: Re: Use fast device only for metadata? References: <874mdktk4t.fsf@vostro.rath.org> <20160207210713.7e4661a8@jupiter.sol.kaishome.de> <1507413.RERLDqpHyU@merkaba> <87twliri6m.fsf@thinkpad.rath.org> Date: Tue, 09 Feb 2016 20:08:39 -0800 In-Reply-To: <87twliri6m.fsf@thinkpad.rath.org> (Nikolaus Rath's message of "Mon, 08 Feb 2016 13:44:17 -0800") Message-ID: <87pow5tdfc.fsf@vostro.rath.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Feb 08 2016, Nikolaus Rath wrote: > Otherwise I'll give bcache a shot. I've avoided it so far because of the > need to reformat and because of rumours that it doesn't work well with > LVM or BTRFS. But it sounds as if that's not the case.. I now have the following stack: btrfs on LUKS on LVM on bcache The VG contains two bcache PVs with backing devices on different spinning disks, and a shared cache device on SSD. I'm using Kernel 4.3. I'm super happy with the performance, boot times increased from 1:30 minutes to X11 and 2:00 to Firefox roughly 0:10 to X11 and 0:30 to Firefox. Time will tell if it also keeps my data intact, but I hope btrfs would at least detect any corruption. Best, -Nikolaus -- GPG encrypted emails preferred. Key id: 0xD113FCAC3C4E599F Fingerprint: ED31 791B 2C5C 1613 AF38 8B8A D113 FCAC 3C4E 599F »Time flies like an arrow, fruit flies like a Banana.«