From mboxrd@z Thu Jan 1 00:00:00 1970 From: "J. Bruce Fields" Subject: Re: a simple and scalable pNFS block layout server Date: Tue, 6 Jan 2015 14:17:32 -0500 Message-ID: <20150106191731.GC28003@fieldses.org> References: <1420561721-9150-1-git-send-email-hch@lst.de> <20150106173222.GF12067@fieldses.org> <20150106175611.GA16413@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Jeff Layton , linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com To: Christoph Hellwig Return-path: Received: from fieldses.org ([174.143.236.118]:43925 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751284AbbAFTRe (ORCPT ); Tue, 6 Jan 2015 14:17:34 -0500 Content-Disposition: inline In-Reply-To: <20150106175611.GA16413@lst.de> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Tue, Jan 06, 2015 at 06:56:11PM +0100, Christoph Hellwig wrote: > On Tue, Jan 06, 2015 at 12:32:22PM -0500, J. Bruce Fields wrote: > > - do we have evidence that this is useful in its current form? >=20 > What is your threshold for usefulness? It passes xfstests fine, and > shows linear scalability with multiple clients that each have 10GB > links.=20 Sounds good. It'd be interesting to see details if they can be posted. --b. > > - any advice on testing? Is there was some simple virtual setup > > that would allow any loser with no special hardware (e.g., me) > > to check whether they've broken the block server? >=20 > Run two kvm VMs that share the same disk. Create an XFS filesystem > on the MDS, and export it. If the client has blkmapd running (on Deb= ian > it needs to be started manually) it will use pNFS for accessing the > filesystem. Verify that using the per-operation counters in > /proc/self/mounstats. Repeat with additional clients as nessecary. >=20 > Alternatively set up a simple iSCSI target using tgt or lio and > connect to it from multiple clients. >=20 > > - any debugging advice? E.g., have you checked if current > > wireshark can handle the MDS traffic? >=20 > The wireshare version I've used decoded the generic pNFS operations > fine, but just dumps the layout specifics as hex data. >=20 > Enable the trace points added in this series, they track all stateid > interactions in the server. Addit=D1=96onally the pnfs debug printks= on > client and server dump a lot of information. > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" = in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel= " in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html