z.rebalMeta.PoolStats[poolIdx].Info.Status = status
				z.rebalMeta.PoolStats[poolIdx].Info.EndTime = now
				z.rebalMu.Unlock()

			case <-timer.C:
				notify = false
				traceMsg = fmt.Sprintf("saved at %s", time.Now())
			}

			stopFn := globalRebalanceMetrics.log(rebalanceMetricSaveMetadata, poolIdx, traceMsg)
			err := z.saveRebalanceStats(GlobalContext, poolIdx, rebalSaveStats)
			stopFn(0, err)

	CompleteMultipartUpload(ctx context.Context, bucket, object, uploadID string, uploadedParts []CompletePart, opts ObjectOptions) (objInfo ObjectInfo, err error)

	GetDisks(poolIdx, setIdx int) ([]StorageAPI, error) // return the disks belonging to pool and set.
	SetDriveCounts() []int                              // list of erasure stripe size for each pool in order.

	// Healing operations.