On Tuesday 13 October 2009, Andreas Dilger wrote: > On 12-Oct-09, at 12:11, Lundgren, Andrew wrote: > > I have tried using: > > > > # lctl conf_param content-MDT0000.osc.lru_size=800 > > > > Seen this in the log: > > Oct 12 18:35:36 abcd0202 kernel: Lustre: Modifying parameter content- > > MDT0000-mdc.osc.lru_size in log content-client > > Oct 12 18:35:36 abcd0202 kernel: Lustre: Skipped 1 previous similar > > message > > > > But then on the clients, the lru_size doesn't seem to change: > > > > OSS # cat ./fs/lustre/ldlm/namespaces/*/lru_size > > 33 > > 0 > > 0 > > 0 > > 1 > > 0 > > 1 > > 200 > > > > I have also set it for the OST individually from the MDS. It > > doesn't seem to do anything for the other machines. > > > > Is this a permanently tunable parameter, or am I just specifying the > > wrong setting? > > My apologies. Any parameter settable in a /proc/fs/lustre/ file can > usually > be specified as <obd|fsname>.<obdtype>.<proc_file_name>=<value>, e.g.:
Thanks, I think this should go into the the man page of lctl. > > * tunefs.lustre --param mdt.group_upcall=NONE /dev/sda1 > * lctl conf_param testfs-MDT0000.mdt.group_upcall=NONE > * lctl conf_param testfs.llite.max_read_ahead_mb=16 > * ... testfs-MDT0000.lov.stripesize=2M > * ... testfs-OST0000.osc.max_dirty_mb=29.15 > * ... testfs-OST0000.ost.client_cache_seconds=15 > * ... testfs.sys.timeout=40 > > However, it isn't currently possible to specify a conf_param tunable > for ldlm > settings, since they do not have their own OBD device and the tunable > code is > (unfortunately) slightly different than other parts of the Lustre proc > tunables. > > Ages and ages ago, this was done because the externally-contributed > lprocfs code > was very buggy and we wanted to make sure that the ldlm /proc tunables > (which > were, at the time, the only ones that were actually required for Lustre > functionality) would continue working while lprocfs was disabled until > fixed. > > Until now, there was no reason to change that code, but it makes sense > to fix > that now... Could you file a bug on this? Done, bug 21084 Cheers, Bernd -- Bernd Schubert DataDirect Networks _______________________________________________ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss