CLUSTER_RESYNC_WINDOW_SECTORS
conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS;
window_size = (CLUSTER_RESYNC_WINDOW_SECTORS > window_size) ?
CLUSTER_RESYNC_WINDOW_SECTORS : window_size;
conf->cluster_sync_high = sector_nr + CLUSTER_RESYNC_WINDOW_SECTORS;