sleep(6000);
long updateTime = System.currentTimeMillis();
LOG.debug("updateTime=" + updateTime);
sleep(3000);
data = new byte[dataLength];
random.nextBytes(data);
sleep(10000);
long updateTime = System.currentTimeMillis();
ds.updateModifiedDateOnAccess(updateTime);
sleep(3000);
data = new byte[dataLength];
random.nextBytes(data);