At '%8' the Exchange store database '%1' copy on this server experienced an I/O error that it may be able to repair. For ...

At '%8' the Exchange store database '%1' copy on this server experienced an I/O error that it may be able to repair. For more detail about this failure, consult the Event log on the server for other storage and "ExchangeStoreDb" events. Page patching was initiated to restore the page.