Normal NFS client reaction when connection lost then re-established

Say I have an NFS share mounted with defaults. There is no outstanding IO to the share and the server goes down. The server comes back up and there is an attempt to access the share. What should happen when this attempt is made? It seems to me that it should be like the server never went down. Instead, things behave more like the server never came back up: any application attempting to access it hangs indefinitely.
Using the mount option 'soft' prevents this from happening, but it doesn't seem like one should have to risk 'silent data corruption' to prevent the client from going completely stupid when it loses contact for a period that no contact should be necessary.

This is HIGHLY unrecommended. The NFS protocol has never, and probably will never, highly robust. VPN tunnels are prone to latency issues and session drops as a result. For this reason smb or afp or any form of FTP or sFTP is far more safe and reliable. All of these other protocols have mechanisms for reestablishing a session lost due to latency, unlike NFS. Additionally, NFS is sufficiently embedded in most UNIX kernels to potentially lock or crash the NFS client when a session goes stale. More recent versions of many OS's, including Solaris 9, have overcome the crash conditions usually caused, but at the expense of NFS filesystem integrity...

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Hi Rick,
Thank you for your patience.
According to your description, would you please let me know what command you were using to make a self-signed certificate by tool makecert? I would like to try to reproduce this issue. Also based on my experience, please let me
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I need to use ActiveMQ-CPP because I need a C++ messaging client which supports failover, which OpenMQ's C client does not. I thought it was unlikely that it wouldn't be able to connect as well. I can't find a good way to debug the ActiveMQ-CPP client enough to know whether the problem is on the ActiveMQ-CPP client's end or the OpenMQ broker's end.
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class HelloWorldConsumer : public ExceptionListener,
public MessageListener,
public Runnable {
private:
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virtual ~HelloWorldConsumer(){
cleanup();
void close() {
this->cleanup();
void waitUntilReady() {
latch.await();
virtual void run() {
try {
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// Create a Session
if( this->sessionTransacted == true ) {
session = connection->createSession( Session::SESSION_TRANSACTED );
} else {
session = connection->createSession( Session::AUTO_ACKNOWLEDGE );
// Create the destination (Topic or Queue)
if( useTopic ) {
destination = session->createTopic( "TEST.FOO" );
} else {
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// Create a MessageConsumer from the Session to the Topic or Queue
consumer = session->createConsumer( destination );
consumer->setMessageListener( this );
std::cout.flush();
std::cerr.flush();
// Indicate we are ready for messages.
latch.countDown();
// Wait while asynchronous messages come in.
doneLatch.await( waitMillis );
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// Indicate we are ready for messages.
latch.countDown();
e.printStackTrace();
// Called from the consumer since this class is a registered MessageListener.
virtual void onMessage( const Message* message ){
static int count = 0;
try
count++;
const TextMessage* textMessage =
dynamic_cast< const TextMessage* >( message );
string text = "";
if( textMessage != NULL ) {
text = textMessage->getText();
} else {
text = "NOT A TEXTMESSAGE!";
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} catch (CMSException& e) {
e.printStackTrace();
// Commit all messages.
if( this->sessionTransacted ) {
session->commit();
// No matter what, tag the count down latch until done.
doneLatch.countDown();
// If something bad happens you see it here as this class is also been
// registered as an ExceptionListener with the connection.
virtual void onException( const CMSException& ex AMQCPP_UNUSED) {
printf("CMS Exception occurred. Shutting down client.\n");
ex.printStackTrace();
exit(1);
int main(int argc AMQCPP_UNUSED, char* argv[] AMQCPP_UNUSED) {
activemq::library::ActiveMQCPP::initializeLibrary();
std::cout << "=====================================================\n";
std::cout << "Starting the example:" << std::endl;
std::cout << "-----------------------------------------------------\n";
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"tcp://localhost:61613"
"?wireFormat=stomp"
// "&soConnectTimeout=5"
// "&connection.sendTimeout=5"
// "&connection.useAsyncSend=true"
// "&transport.useInactivityMonitor=false"
// "&connection.alwaysSyncSend=true"
// "&connection.useAsyncSend=true"
// "&transport.commandTracingEnabled=true"
// "&transport.tcpTracingEnabled=true"
// "&wireFormat.tightEncodingEnabled=true"
//============================================================
// set to true to use topics instead of queues
// Note in the code above that this causes createTopic or
// createQueue to be used in both consumer an producer.
//============================================================
bool useTopics = true;
bool sessionTransacted = false;
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HelloWorldProducer producer( brokerURI, numMessages, useTopics );
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consumerThread.start();
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consumer.waitUntilReady();
// Start the producer thread.
Thread producerThread( &producer );
producerThread.start();
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producer.close();
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Thanks!

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<email address removed by hosts>
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Proc procedure block when connection lost

hi,
i develop a database procedure in linux by proc,the problem as follow:
i create a connection on another computer,when i do some operaters ,at this time,network wire break, i continue doing operaters but the procedure blocked . i configure two address in net8, the orther database server is ok,but the procedure not change the address ,the main problem is the procedure don't return any error,only blocking here.
thanks

hi,
i develop a database procedure in linux by proc,the problem as follow:
i create a connection on another computer,when i do some operaters ,at this time,network wire break, i continue doing operaters but the procedure blocked . i configure two address in net8, the orther database server is ok,but the procedure not change the address ,the main problem is the procedure don't return any error,only blocking here.
thanks

No reaction when connect to pc

E65

Hi Faishal
Welcome to the forum.
What Windows version are you using OVI Suite with here?
Happy to have helped forum in a small way with a Support Ratio = 37.0

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I am having the exact same problem as Aaron. It's nuts...
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Normal NFS client reaction when connection lost then re-established

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