FWIW, we seem to be OK with just "read_cache_enable=0". Don't know if that is sufficient to avoid the data corruption or not. It will have to do though because running with "writethrough_cache_enable=0" crashes the OSSs within a few minutes of completing recovery.
Charlie Taylor UF HPC Center On Wed, 2009-09-09 at 15:30 -0400, Charles A. Taylor wrote: > > On Wed, 2009-09-09 at 13:23 -0600, Lundgren, Andrew wrote: > > Does this need to be run on EACH OSS? Is there a central way to do it on > > the MDS? > > > > You recommend disabling the read and the write as the settings indicate or > > just the read as the text indicates? > > A clarification would be good here. So far, we have found that our > OSSs crash with the recommended work-around so that is a non-starter for > us. If we can run with just the read_cache_enable=0 and that is > acceptable to avoid the corruptions bug, then that would be good to > know. > > At the moment we are not even sure we can run with just > read_cache_enable=0. We just know that we can't run with them both > disabled for more than a few minutes with crashing in > obd_filter_preprw(). > > Charlie Taylor > UF HPC Center > > > > > -----Original Message----- > > > > A patch is under testing and will be included in 1.8.1.1. > > Until 1.8.1.1 is available, we recommend to disable the OSS read cache > > feature. This feature can be disabled by running the two following > > commands on the OSSs: > > # lctl set_param obdfilter.*.writethrough_cache_enable=0 > > # lctl set_param obdfilter.*.read_cache_enable=0 > > > > This has to be done each time an OST is restarted. > > > > Best regards, > > Johann, for the Lustre team > > _______________________________________________ > > Lustre-discuss mailing list > > [email protected] > > http://lists.lustre.org/mailman/listinfo/lustre-discuss > > _______________________________________________ > > Lustre-discuss mailing list > > [email protected] > > http://lists.lustre.org/mailman/listinfo/lustre-discuss > > _______________________________________________ > Lustre-discuss mailing list > [email protected] > http://lists.lustre.org/mailman/listinfo/lustre-discuss _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
