On Mon, Feb 18, 2008 at 08:57:32AM +0100, Dilling wrote: > where xxx is one of the following: commitrw,journal start,parent > lock,preprw_write,start_page_write,journal start,parent lock,preprw_read > setup,start_page_read,setattr > and xy is of order 10-40s. The frequency of these messages depends on > the load of the OSTs. On all OSTs we observe a very high load between 20 > and 120 alternating between all 4 OSTs. We also see up too 900 ll_ost_io > threads.
Have you seen 900 ll_ost_io threads on a single OSS? Theoretically, the number of ll_ost_io is limited to 512 (i.e. OSS_THREADS_MAX). Could you please try to enforce the number of ost threads to 128 or 256? To do so: stop the OSTs, unload the lustre modules and add the following line in /etc/modprobe.conf: options ost oss_num_threads=128 Johann _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
