After reading the differences between fail-stop and crash both looks same to me. There is no subtle difference between these two.
In fail-stop node halts and in crash nodes also halts.
In fail-stop, other nodes will come to know that a node has been halted when the node is unable to respond to communication. And in crash, it also looks the same.
Can you please clarify this?
Fail-stop and crash are similar in that both result in a node halting its execution, but there is a subtle difference between them.
In a fail-stop scenario, the node intentionally halts its execution due to a detected error or by following a protocol for shutting down. The other nodes in the system can detect that the node has failed by monitoring its behavior and communication. For example, if the node stops responding to messages, the other nodes can conclude that it has failed.
In contrast, a crash occurs when a node abruptly terminates its execution due to an unexpected error, such as a hardware failure, software bug, or system overload. In this case, the other nodes may not be immediately aware of the crash and may only discover it when they try to communicate with the node and receive no response.
So, the key difference between fail-stop and crash is that in fail-stop, the node stops its execution intentionally and predictably, while in a crash, it stops execution unexpectedly and unpredictably. This distinction is important for designing and implementing fault-tolerant systems that can continue to operate even in the face of node failures.
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