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. This is not a theory, we meet these problems ever day. >> 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 > Trond > Heart -- 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
