Hi, back on my computer.
So, I thought that the network communication was the bottle neck, but just in case I tested whether it's the server itself that was somehow exceptionally slow. I copy/pasted the earlier mentioned test directory (see the full message below) first in the normal unix environment /home/user/...(source and target), which turned out to be extremely fast (HW supported virtualization on a SSD disk). So, no problem there. Then I got access to an afs account on the same machine (kinit; aklog), and copied the same test directory in /afs/cell/user/...(source and target) which turned out to be extremely slow. All this took place on the very same server machine, without any external clients. I do suspect that in afs case, some traffic _may_ leave the machine (use dns to find the external address and return back to the very same machine, maybe...), which may explain partly the results. I'm a bit puzzled since everything works, but annoyingly slowly for serious use. Of course my main concern is the speed for clients, not within the server. I did try to optimize the fileserver parameters, but I could only gain like 30-40% improvement. I believe there is some bigger issue to be solved first. I wonder if anybody else has had a similar issue, or if you could think of any possible causes for this sort of symptons? As said, I'd be happy to give more information. br, jukka > Terve Atro, > > I'm willing to give as much information as needed. What kind of > information you had in mind? > > br, jukka > > Sent from my iPhone > > On 7.4.2013, at 18.47, Atro Tossavainen <[email protected]> > wrote: > >>> How I tested: >>> >>> I duplicated the directory A) inside afs space >>> B) outside afs, but on the same server >> >> You'll need to be more precise than that for anybody to be able to say >> anything, I think. >> >> _______________________________________________ >> OpenAFS-info mailing list >> [email protected] >> https://lists.openafs.org/mailman/listinfo/openafs-info > _______________________________________________ > OpenAFS-info mailing list > [email protected] > https://lists.openafs.org/mailman/listinfo/openafs-info > Hi, there must be something seriously wrong about my openafs server. It is still in a development state, so all server functions are located on a single virtual machine. While trying to figure out optimal fileserver parameters, I noticed that even the basic disk operations are extremely slow on the afs server locally. How I tested: I had a directory containing about 2000 files, 300 MB in total. I duplicated the directory A) inside afs space B) outside afs, but on the same server While the A) speed was between 500-1000KB/s, for B) the total operation took only about 2-3 seconds (~150MB/s)! So, eventhough everything works, there must be some misconfiguration somewhere, rather than just a parameter optimization. I don't know whether the traffic leaves the server just to come back immediately, but even then I would expect faster operations (110/10Mb internet). The server runs on Ubuntu 10.04, openafs 1.4 or 1.6 made no significant difference. There is a whole lot of other functionality on the server, so a total reinstallation is not a pleasent option. Any ideas what could cause this? br, jukka _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info
