From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-f49.google.com ([209.85.215.49]:34865 "EHLO mail-lf0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751975AbdIANwI (ORCPT ); Fri, 1 Sep 2017 09:52:08 -0400 Received: by mail-lf0-f49.google.com with SMTP id g18so1096895lfl.2 for ; Fri, 01 Sep 2017 06:52:07 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20170831163656.6be88191@natsu> References: <556e7650-8556-d5ca-273e-6c158c1d032e@prismatelecomtesting.com> <20170831163656.6be88191@natsu> From: Juan Orti Alcaine Date: Fri, 1 Sep 2017 15:52:06 +0200 Message-ID: Subject: Re: mount time for big filesystems To: Roman Mamedov Cc: Marco Lorenzo Crociani , Btrfs BTRFS Content-Type: text/plain; charset="UTF-8" Sender: linux-btrfs-owner@vger.kernel.org List-ID: 2017-08-31 13:36 GMT+02:00 Roman Mamedov : > If you could implement SSD caching in front of your FS (such as lvmcache or > bcache), that would work wonders for performance in general, and especially > for mount times. I have seen amazing results with lvmcache (of just 32 GB) for > a 14 TB FS. I'm thinking about adding a SSD for my 4 disks RAID1 filesystem, but I have doubts about how to correctly do it in a multidevice filesystem. I guess I should make 4 partitions on the SSD and pair them with my backing devices, then create the btrfs on top of bcache0, bcache1,... is this the right way to do it?