INITIAL_SUBDISKS
SD = (struct sd *) Malloc(sizeof(struct sd) * INITIAL_SUBDISKS);
bzero(SD, sizeof(struct sd) * INITIAL_SUBDISKS);
vinum_conf.subdisks_allocated = INITIAL_SUBDISKS;
EXPAND(SD, struct sd, vinum_conf.subdisks_allocated, INITIAL_SUBDISKS);