Q: What do 'QUEUE FULL!' lines in /var/log/messages mean?
We have a system that I have recently upgraded to the 2.0.34 kernel. It's a single processor, Pentium II, Red Hat 5.0 system. It's successfully running, but it's dumping lines like the ones below into /var/log/messages, periodically:
Aug 10 13:39:28 mithrandir kernel: ncr53c875-0-<0,0>:
tagged command queue depth set to 64
Aug 10 13:39:46 mithrandir kernel: ncr53c875-0-<0,0>:
tagged command queue depth set to 33
Aug 10 13:39:46 mithrandir kernel: ncr53c875-0-<0,0>:
QUEUE FULL! 31 busy,
33 disconnected CCBs
Aug 10 14:00:13 mithrandir kernel: ncr53c875-0-<0,0>:
tagged command queue depth set to 34
Are these just verbose records of the status of the SCSI adapter, or are they indications of a problem and/or a kernel misconfiguration? I'm just looking for some pointers, so any/all info is appreciated.
A: Yes this is just an informational message telling you that the SCSI driver is resetting the queue depth. By default, the queue is set too high, and sends too many jobs to the drive. So, the driver changes the queue depth. This doesn't indicate problems, but is the normal behavior of the driver. It's nothing to worry about, unless it's filling your log files.