|Component:||Microsoft Exchange Extensible Storage Engine|
|Message:||<process name> (<process id>) <storage group name>An attempt to determine the minimum I/O block size for the volume “<name>” containing “<file name>” failed with system error <error code>: “<error message>“. The operation will fail with error <error code>.|
You receive the following error in the Description of ESE event 491:
An attempt to determine the minimum I/O block size for the volume [drive\path] failed with [error #]. The operation will fail with error [error #].
This means that an unexpected error was encountered while trying to use the volume specified in the message. Specifically, an error occurred when an attempt to determine the minimum input/output (I/O) block size for the volume failed.
The cause depends on the Error listed at the end of the Description section of the event. The most frequent causes are listed below.