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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5BEF6C433EF for ; Wed, 20 Oct 2021 16:35:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3BBD76137C for ; Wed, 20 Oct 2021 16:35:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230343AbhJTQiM (ORCPT ); Wed, 20 Oct 2021 12:38:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230190AbhJTQiG (ORCPT ); Wed, 20 Oct 2021 12:38:06 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7924BC061753 for ; Wed, 20 Oct 2021 09:35:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=zx+ak0Ea0xbaTBVHW/n6DapveIqJ7LfvfSX6V19C9Jk=; b=C51qq5phbkSRs+AIeNJ1FDERzt JsckUg1nhD6JjtM0iURVhGXqOou82MOkeL4kchsCROwhifd2SAhEqrZ5sTp/bTjq0DR1ZbAmY+Rzy fGgPPSncIPe/iCB1abfBfKFU8Cyr2veIjHK2OVq671g8Co+eaGnywAQ6AZK/x2BFf06OmzwoNsrwP BW4li0aP2tzWinQTUFprKi3RWpH+tPEr+DGmQ5Nh+JS6ZiwkthFsAVsjBzT9Sbk9Gh1KNBcM8K9kb 63HSiFE9Zw1ThQ2d29yeKISCi8ORdDLtBx93wVUUiC8w/kC/7cpPJTUaDMiwcRbh/faojxXXg0MjJ Xc1+l/qA==; Received: from hch by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mdEZE-005FyD-7A; Wed, 20 Oct 2021 16:35:52 +0000 Date: Wed, 20 Oct 2021 09:35:52 -0700 From: Christoph Hellwig To: Dan Greenfield Cc: linux-xfs@vger.kernel.org Subject: Re: XFS NVMe RDMA? Message-ID: References: <965EC18A-BF96-4544-AFE0-FA0F1787FD49@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org On Wed, Oct 20, 2021 at 09:33:43AM -0700, Christoph Hellwig wrote: > On Wed, Oct 20, 2021 at 12:51:05PM +0100, Dan Greenfield wrote: > > Do you have any ideas how they could have been able to utilise RDMA so that node A can directly access data chunks stored on XFS on node B? Is the only approach to mmap the chunk on node B and then RDMA it to/from node A? > > I'm not going to watch a video, but with the pNFS code other nodes can > access data on an XFS node directly using any SCSI transport. > For RMDA that would be SRP or iSCSI/iSER. > > Note that I also have an unfinished draft to support NVMe, which has > an RDMA transports as well and someone else could trivially reimplement > that as well. Oh, and just FYI here are my slides on the pNFS support: https://events.static.linuxfound.org/sites/events/files/slides/pnfs.pdf