From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E068C636D4 for ; Mon, 13 Feb 2023 16:47:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229667AbjBMQrt (ORCPT ); Mon, 13 Feb 2023 11:47:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40926 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229570AbjBMQrt (ORCPT ); Mon, 13 Feb 2023 11:47:49 -0500 Received: from vps.thesusis.net (vps.thesusis.net [34.202.238.73]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 372141043C for ; Mon, 13 Feb 2023 08:47:47 -0800 (PST) Received: by vps.thesusis.net (Postfix, from userid 1000) id 71B2010971A; Mon, 13 Feb 2023 11:47:16 -0500 (EST) References: <874jrun7zl.fsf@vps.thesusis.net> User-agent: mu4e 1.7.12; emacs 27.1 From: Phillip Susi To: Johannes Thumshirn Cc: "linux-btrfs@vger.kernel.org" Subject: Re: [PATCH v5 00/13] btrfs: introduce RAID stripe tree Date: Mon, 13 Feb 2023 11:42:25 -0500 In-reply-to: Message-ID: <873579y0kr.fsf@vps.thesusis.net> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Johannes Thumshirn writes: > No. With zoned drives we're writing using the Zone Append command [1]. > This has several advantages, one being that you can issue IO at a high > queue depth and don't need any locking to. But it has one downside for > the RAID application, that is, that you don't have any control of the > LBA where the data lands, only the zone. Can they be reordered in the queue? As long as they are issued in the same order on both drives and can't get reordered, I would think that the write pointer on both drives would remain in sync.