We turn on several clients to send data to the same mongod process. When speed of writing to disc come up to aproximate 4M/S, the mongod process crashes. We could not check mongod process using top under linux. However, when we use netstat, we find that those ports mornitored by mongod are still being mornitored, and every command related to mongod is bollocked.what's more,the files using to save the collections are locked(cann't access these files!)