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From: Jeff Layton <jeff.layton@primarydata.com>
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>,
	xfs@oss.sgi.com
Subject: Re: [PATCH 14/18] nfsd: pNFS block layout driver
Date: Tue, 6 Jan 2015 11:42:05 -0800	[thread overview]
Message-ID: <20150106114205.4151269c@synchrony.poochiereds.net> (raw)
In-Reply-To: <20150106193949.GD28003@fieldses.org>

On Tue, 6 Jan 2015 14:39:49 -0500
"J. Bruce Fields" <bfields@fieldses.org> 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 <jlayton@primarydata.com>

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  reply	other threads:[~2015-01-06 19:42 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-06 16:28 a simple and scalable pNFS block layout server Christoph Hellwig
2015-01-06 16:28 ` [PATCH 01/18] nfs: add LAYOUT_TYPE_MAX enum value Christoph Hellwig
2015-01-06 16:28 ` [PATCH 02/18] fs: add FL_LAYOUT lease type Christoph Hellwig
2015-01-06 18:46   ` Jeff Layton
2015-01-07 10:30     ` Christoph Hellwig
2015-01-06 16:28 ` [PATCH 03/18] nfsd: factor out a helper to decode nfstime4 values Christoph Hellwig
2015-01-09 23:02   ` Tom Haynes
2015-01-11 11:42     ` Christoph Hellwig
2015-01-11 23:53       ` Tom Haynes
2015-01-06 16:28 ` [PATCH 04/18] nfsd: move nfsd_fh_match to nfsfh.h Christoph Hellwig
2015-01-06 16:28 ` [PATCH 05/18] nfsd: add fh_fsid_match helper Christoph Hellwig
2015-01-06 16:28 ` [PATCH 06/18] nfsd: make lookup/alloc/unhash_stid available outside nfs4state.c Christoph Hellwig
2015-01-06 16:28 ` [PATCH 07/18] nfsd: make find/get/put file " Christoph Hellwig
2015-01-06 16:28 ` [PATCH 08/18] nfsd: make find_any_file " Christoph Hellwig
2015-01-06 16:28 ` [PATCH 09/18] nfsd: implement pNFS operations Christoph Hellwig
2015-01-09  0:48   ` Jeff Layton
2015-01-09 10:05     ` Christoph Hellwig
2015-01-09 16:51       ` Jeff Layton
2015-01-09 17:16         ` Christoph Hellwig
2015-01-09 17:28           ` Jeff Layton
2015-01-09 17:33             ` Jeff Layton
2015-01-09 17:43               ` Trond Myklebust
2015-01-12 17:54   ` Tom Haynes
2015-01-06 16:28 ` [PATCH 10/18] nfsd: implement pNFS layout recalls Christoph Hellwig
2015-01-06 17:25   ` J. Bruce Fields
2015-01-06 17:42     ` Christoph Hellwig
2015-01-06 17:59       ` Tom Haynes
2015-01-06 16:28 ` [PATCH 11/18] nfsd: update documentation for pNFS support Christoph Hellwig
2015-01-06 16:28 ` [PATCH 12/18] nfsd: add trace events Christoph Hellwig
2015-01-06 16:28 ` [PATCH 13/18] exportfs: add methods for block layout exports Christoph Hellwig
2015-01-06 16:28 ` [PATCH 14/18] nfsd: pNFS block layout driver Christoph Hellwig
2015-01-06 17:16   ` J. Bruce Fields
2015-01-06 17:39     ` Christoph Hellwig
2015-01-06 19:39       ` J. Bruce Fields
2015-01-06 19:42         ` Jeff Layton [this message]
2015-01-07 10:28           ` Christoph Hellwig
2015-01-08 20:41             ` Jeff Layton
2015-01-08 20:54               ` J. Bruce Fields
2015-01-12  4:56   ` Tom Haynes
2015-01-12 12:43     ` Christoph Hellwig
2015-01-12  6:14   ` Tom Haynes
2015-01-12 12:46     ` Christoph Hellwig
2015-01-06 16:28 ` [PATCH 15/18] xfs: pass a 64-bit count argument to xfs_iomap_write_unwritten Christoph Hellwig
2015-01-06 16:28 ` [PATCH 16/18] xfs: do not allocate blocks when converting unwritten extents Christoph Hellwig
2015-01-06 23:21   ` Dave Chinner
2015-01-06 16:28 ` [PATCH 17/18] xfs: implement pnfs export operations Christoph Hellwig
2015-01-07  0:24   ` Dave Chinner
2015-01-07 10:40     ` Christoph Hellwig
2015-01-07 21:11       ` Dave Chinner
2015-01-08 12:43         ` Christoph Hellwig
2015-01-08 21:04           ` Dave Chinner
2015-01-09 11:41             ` Christoph Hellwig
2015-01-12  3:04               ` Dave Chinner
2015-01-14 10:08                 ` Christoph Hellwig
2015-01-06 16:28 ` [PATCH 18/18] xfs: recall pNFS layouts on conflicting access Christoph Hellwig
2015-01-06 23:18   ` Dave Chinner
2015-01-07 10:31     ` Christoph Hellwig
2015-01-06 17:32 ` a simple and scalable pNFS block layout server J. Bruce Fields
2015-01-06 17:56   ` Christoph Hellwig
2015-01-06 18:37     ` Jeff Layton
2015-01-06 18:39       ` Weston Andros Adamson
2015-01-06 19:17     ` J. Bruce Fields

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