This read-only Counter reports how many times, since the driver was loaded, the SCSI Hardware Interface driver issued a command but did not receive a reply within the specified time, with the description noting occasional timeouts can occur when the bus is busy but a dramatic rise warrants checking for non-disk SCSI devices or other issues. Admins watch this counter to catch a bus that is becoming unreliable before it causes application-visible errors. For example, an admin seeing this timeout counter rise steadily checks for a non-disk SCSI device on the bus that may be responding too slowly under load.