From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx05.extmail.prod.ext.phx2.redhat.com [10.5.110.29]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A7D3F5B82F for ; Sat, 13 May 2017 12:16:24 +0000 (UTC) Received: from mr003msb.fastweb.it (mr003msb.fastweb.it [85.18.95.87]) by mx1.redhat.com (Postfix) with ESMTP id 7FF4E15567 for ; Sat, 13 May 2017 12:16:21 +0000 (UTC) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Date: Sat, 13 May 2017 14:16:18 +0200 From: Gionatan Danti In-Reply-To: <2dad6517-22f4-032d-6d7d-44641c4b871f@free.fr> References: <2dad6517-22f4-032d-6d7d-44641c4b871f@free.fr> Message-ID: Subject: Re: [linux-lvm] Question on mixing technologies Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: LVM general discussion and development You basically have two possibilities: 1) move the root fs on the M.2 disk, which will give you much higher system responsiveness compared to the mechanical disks; however, any data/application installed on the HDD will be slow as always; 2) configure lvmcache [1] for using the M.2 disk as a read-only (writethrough) caching device for the mechanical disks, which will give you somewhat lesser system responsiveness but *any* cache-friendly application will be accelerated from the M.2 disk. [1] http://man7.org/linux/man-pages/man7/lvmcache.7.html Regards. Il 12-05-2017 18:21 Georges Giralt ha scritto: > Hello guys, > > I've an Ubuntu machine with two SATA mechanical drives on software raid > 1. > > This md is the sole PV of the LVM installation. > > As the mainboard has been changed recently, it has an M.2 plug. And > I'm been offered a 128 GB M.2 NGFF card. > > So far so good. > > Question : Will I gain something adding the M.2 card as a second PV on > my LVM setup and moving the system LV to it ? > > What are your experience on the subject ? > > Many thanks in advance for your advice ! -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti@assyoma.it - info@assyoma.it GPG public key ID: FF5F32A8