From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars Marowsky-Bree Subject: Re: ceph-disk improvements Date: Thu, 7 Apr 2016 11:26:27 +0200 Message-ID: <20160407092627.GE26235@suse.de> References: <2041558235.2113.160e133c-ee3f-4c6e-9b8b-e4d468651d78.open-xchange@ox.pcextreme.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mx2.suse.de ([195.135.220.15]:56312 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751440AbcDGJ03 (ORCPT ); Thu, 7 Apr 2016 05:26:29 -0400 Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id C5C96ABC7 for ; Thu, 7 Apr 2016 09:26:26 +0000 (UTC) Content-Disposition: inline In-Reply-To: <2041558235.2113.160e133c-ee3f-4c6e-9b8b-e4d468651d78.open-xchange@ox.pcextreme.nl> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org On 2016-04-02T07:54:05, Wido den Hollander wrote: >=20 > > Op 1 april 2016 om 17:36 schreef Sage Weil : > >=20 > >=20 > > Hi all, > >=20 > > There are a couple of looming features for ceph-disk: > >=20 > > 1- Support for additional devices when using BlueStore. There can = be up=20 > > to three: the main device, a WAL/journal device (small, ~128MB, ide= ally=20 > > NVRAM), and a fast metadata device (as big as you have available; w= ill be=20 > > used for internal metadata). > >=20 > > 2- Support for setting up dm-cache, bcache, and/or FlashCache under= neath=20 > > filestore or bluestore. > >=20 >=20 > Keep in mind that you can't create a partition on a bcache device. So= when using > bcache, the journal has to be filebased and not a partition. Is there a point to running the journal on bcache? I see a point for bcache for the (potentially on HDD) actual data store - but the WAL/journal, would that not be directly on NVMe/PM/SSD (at the very least)? Without an intervening cache? Regards, Lars --=20 Architect SDS, Distinguished Engineer SUSE Linux GmbH, GF: Felix Imend=F6rffer, Jane Smithard, Graham Norton,= HRB 21284 (AG N=FCrnberg) "Experience is the name everyone gives to their mistakes." -- Oscar Wil= de -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html