Hi, This chapter of the may answer your question about slow read perfoamnce
23.3.2 Write Performance Better Than Read Performance http://wiki.lustre.org/manual/LustreManual20_HTML/LustreTroubleshooting.html#50548790_pgfId-1294879 Wojciech On 4 January 2011 20:14, robert <[email protected]> wrote: > Hi Everyone! > > I just setup a lustre system on centos 5.5 and lustre 1.8.5. there are > three identical oss with four osts each. > > After having fantastic write rates but low read rates, I ran the > obdfilter-survey script to get a hint of what may cause this. > > Unfortnately obdfilter-survey in case=disk mode freezes on two of my > three oss at the write task of the 4 objs, 16 threads line and leaves > the system in an unstable state requiring a reboot. The other oss runs > through the script without problems. To exclude a problem in the > system´s setup, I booted one of the bad oss with the working oss´ disk - > with the same faulty result. Creating a new filesystem on all osts of > one of the problem oss neither did the trick. > > Any ideas what may cause this behavior? Thanks! > > Robert > > _______________________________________________ > Lustre-discuss mailing list > [email protected] > http://lists.lustre.org/mailman/listinfo/lustre-discuss > -- Wojciech Turek Senior System Architect High Performance Computing Service University of Cambridge _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
