From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Layton Subject: Re: [PATCH 14/18] nfsd: pNFS block layout driver Date: Tue, 6 Jan 2015 11:42:05 -0800 Message-ID: <20150106114205.4151269c@synchrony.poochiereds.net> References: <1420561721-9150-1-git-send-email-hch@lst.de> <1420561721-9150-15-git-send-email-hch@lst.de> <20150106171658.GD12067@fieldses.org> <20150106173957.GA16200@lst.de> <20150106193949.GD28003@fieldses.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Christoph Hellwig , linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, xfs-VZNHf3L845pBDgjK7y7TUQ@public.gmane.org To: "J. Bruce Fields" Return-path: In-Reply-To: <20150106193949.GD28003-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> Sender: linux-nfs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-fsdevel.vger.kernel.org On Tue, 6 Jan 2015 14:39:49 -0500 "J. Bruce Fields" wrote: > On Tue, Jan 06, 2015 at 06:39:57PM +0100, Christoph Hellwig wrote: > > On Tue, Jan 06, 2015 at 12:16:58PM -0500, J. Bruce Fields wrote: > > > > +file system must sit on shared storage (typically iSCSI) that is accessible > > > > +to the clients as well as the server. The file system needs to either sit > > > > +directly on the exported volume, or on a RAID 0 using the MD software RAID > > > > +driver with the version 1 superblock format. If the filesystem uses sits > > > > +on a RAID 0 device the clients will automatically stripe their I/O over > > > > +multiple LUNs. > > > > + > > > > +On the server pNFS block volume support is automatically if the file system > > > > > > s/automatically/automatically enabled/. > > > > > > So there's no server-side configuration required at all? > > > > The only required configuration is the fencing helper script if you > > want to be able to fence a non-responding client. For simple test setups > > everything will just work out of the box. > > I think we want at a minimum some kind of server-side "off" switch. > > If nothing else it'd be handy for troubleshooting. ("Server crashing? > Could you turn off pnfs blocks and try again?") > > --b. Or maybe an "on" switch? We have some patches (not posted currently) that add a "pnfs" export option. Maybe we should add that and only enable pnfs on exports that have that option present? -- Jeff Layton -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html