LU-13439 lmv: qos stay on current MDT if less full

[fs/lustre-release.git] / lustre / obdclass / lu_tgt_descs.c

diff --git a/lustre/obdclass/lu_tgt_descs.c b/lustre/obdclass/lu_tgt_descs.c
index 04e2330..1e84857 100644 (file)
--- a/lustre/obdclass/lu_tgt_descs.c
+++ b/lustre/obdclass/lu_tgt_descs.c
@@ -273,13 +273,21 @@ int lu_tgt_descs_init(struct lu_tgt_descs *ltd, bool is_mdt)
        init_rwsem(&ltd->ltd_qos.lq_rw_sem);
        set_bit(LQ_DIRTY, &ltd->ltd_qos.lq_flags);
        set_bit(LQ_RESET, &ltd->ltd_qos.lq_flags);
-       /* Default priority is toward free space balance */
-       ltd->ltd_qos.lq_prio_free = 232;
-       /* Default threshold for rr (roughly 17%) */
-       ltd->ltd_qos.lq_threshold_rr = 43;
        ltd->ltd_is_mdt = is_mdt;
-       if (is_mdt)
+       /* MDT imbalance threshold is low to balance across MDTs
+        * relatively quickly, because each directory may result
+        * in a large number of files/subdirs created therein.
+        */
+       if (is_mdt) {
                ltd->ltd_lmv_desc.ld_pattern = LMV_HASH_TYPE_DEFAULT;
+               ltd->ltd_qos.lq_prio_free = LMV_QOS_DEF_PRIO_FREE * 256 / 100;
+               ltd->ltd_qos.lq_threshold_rr =
+                       LMV_QOS_DEF_THRESHOLD_RR_PCT * 256 / 100;
+       } else {
+               ltd->ltd_qos.lq_prio_free = LOV_QOS_DEF_PRIO_FREE * 256 / 100;
+               ltd->ltd_qos.lq_threshold_rr =
+                       LOV_QOS_DEF_THRESHOLD_RR_PCT * 256 / 100;
+       }
 
        return 0;
 }