From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay3-d.mail.gandi.net ([217.70.183.195]:41601 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750823AbaFPHyH convert rfc822-to-8bit (ORCPT ); Mon, 16 Jun 2014 03:54:07 -0400 Received: from mfilter20-d.gandi.net (mfilter20-d.gandi.net [217.70.178.148]) by relay3-d.mail.gandi.net (Postfix) with ESMTP id 6EC6AA80D2 for ; Mon, 16 Jun 2014 09:54:03 +0200 (CEST) Received: from relay3-d.mail.gandi.net ([217.70.183.195]) by mfilter20-d.gandi.net (mfilter20-d.gandi.net [10.0.15.180]) (amavisd-new, port 10024) with ESMTP id NtKncxv6l+0G for ; Mon, 16 Jun 2014 09:54:01 +0200 (CEST) Received: from vajra.localnet (unknown [162.38.105.117]) (Authenticated sender: swami@petaramesh.org) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id C598FA80B0 for ; Mon, 16 Jun 2014 09:54:01 +0200 (CEST) From: =?ISO-8859-1?Q?Sw=E2mi?= Petaramesh To: Linux BTRFS Subject: BTRFS, SSD and single metadata Date: Mon, 16 Jun 2014 09:54:01 +0200 Message-ID: <1723493.aXdklhDgAK@vajra> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi, I created a BTRFS filesytem over LVM over LUKS encryption on an SSD [yes, I know...], and I noticed that the FS got created with metadata in "DUP" mode, contrary to what "man mkfs.btrfs" says for SSDs -> it would be supposed to be "SINGLE"... Well I don't know if my system didn't identify the SSD because of the LVM+LUKS stack (however it mounts well by itself with the "ssd" flag and accepts the "discard" option [yes, I know...]), or if the manpage is obsolete or if this feature just doesn't work...? The SSD being a Micron RealSSD C400 For both SSD preservation and data integrity, would it be advisable to change metadata to "SINGLE" using a rebalance, or if I'd better just leave things the way they are...? TIA for any insight. -- Swâmi Petaramesh http://petaramesh.org PGP 9076E32E Tout le malheur des hommes vient de ce qu'ils ne vivent pas dans _le_ monde, mais dans _leur_ monde. -- Héraclite.