On Tue, 2011-11-29 at 14:58 -0800, Boaz Harrosh wrote: > On 11/29/2011 02:47 PM, Trond Myklebust wrote: > > On Tue, 2011-11-29 at 14:40 -0800, Boaz Harrosh wrote: > >> On 11/29/2011 01:57 PM, Trond Myklebust wrote: > >>>> Also Files when they will support segments and servers that request segments, > >>>> like the CEPH server, will very much enjoy the above, .i.e: Tell me the amount > >>>> you know you want to write. > >>> > >>> Why would we want to add segment support to the pNFS files client??? > >>> Segments are a nuisance that multiply the amount of unnecessary chitchat > >>> between the client and the MDS without providing any tangible > >>> benefits... > >>> > >> > >> Your kidding right? > >> > >> One: it is mandated by the Standard, This is not an option. So a perfectly > >> Standard complaint server is not Supported by Linux because we don't see > >> the point. > > > > Bollocks.. Nothing is "mandated by the Standard". If the server doesn't > > give us a full layout, then we fall back to write through MDS. Why dick > > around with crap that SLOWS YOU DOWN. > > > > NO! MAKE YOU FASTER. > > The kind of typologies I'm talking about a single layout get ever 1GB is > marginal to the gain I get in deploying 100 of DSs. I have thousands of > DSs I want to spread the load evenly. I'm limited by the size of the layout > (Device info in the case of files) So I'm limited by the number of DSs I can > have in a layout. For large files these few devices become an hot spot all > the while the rest of the cluster is idle. I call "bullshit" on that whole argument... You've done sod all so far to address the problem of a client managing layout segments for a '1000 DS' case. Are you expecting that all pNFS object servers out there are going to do that for you? How do I assume that a generic pNFS files server is going to do the same? As far as I know, the spec is completely moot on the whole subject. IOW: I'm not even remotely interested in your "everyday problems" if there are no "everyday solutions" that actually fit the generic can of spec worms that the pNFS layout segments open. > >> Two: There are already file-layout servers out there (multiple) which are > >> waiting for the Linux files-layout segment support, because the underline > >> FS requires Segments and now they do not work with the Linux client. These > >> are CEPH and GPFS and more. > > > > Then they will have a _long_ wait.... > > > > OK, so now I understand. Because when I was talking to Fred before BAT and during > It was very very peculiar to me why he is not already done with that simple stuff. > Because usually Fred is such a brilliant fast programmer that I admire, and that simple > crap? > > But now that explains Yes. It's all a big conspiracy, and we're deliberately holding Fred's genius back in order to disappoint you... -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust@xxxxxxxxxx www.netapp.com -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
