On Apr 18, 2007 16:19 +0800, swin wang wrote: > We hope that if an OST's used rate up to 90% or 95%, it can be marked > FULL, and avoid to use this OST. we plan to add a state FULL in structure > lov_tgt_desc, when the > OST used rate up to 90% or 95%, set its state to FULL, and when create > new object, > don't use these FULL OST. > We want to know how to calculate used rate of a OST, is it like this: > used rate = lov->lov_tgts[i]->ltd_exp->exp_obd->obd_osfs.os_bavail / > ov->lov_tgts[i]->ltd_exp->exp_obd->obd_osfs.os_blocks ??
This is already done on the OSTs in filter_precreate(), though the limit is only 0.1%. I'd be happy to accept a patch which made this limit a tunable in /proc that can be set by the sysadmin. There is also in 1.6 (and betas) some free space management that is tunable on the MDS /proc/fs/lustre/lov/*/qos_priofree which is a percentage of weight which you want to give to "free" OSTs. In your case you want this to be relatively high (90% is the default in later betas). If this is not sufficient to have the MDS allocate very preferentially on free OSTs, please provide more details on your configuration. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. _______________________________________________ Lustre-discuss mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
