dmesg message

[M.M. Oee]

i have a message as per attachment after i run "dmesg" on my system. what does the message interpret? is it a system problem?

Thanks

[Muthukumar_5]

hai.,

Is it the one "SCSI: Ultra160 Controller at 0/4/0/0: Warning: Data transfer rate stepped down for target 2. Now operating at 20 MB/s (Ultra Narrow). Possible causes are improper termination, improper cabling, or malfunctioning hardware."

It indicates that your data transfer rate down to 20 MB/s. It is used to track the data trasfer rate flow rate problem.

It may be hardward problem. It is good to scan I/O hardware with ioscan and lanscan commands.

Regards,
Muthukumar.

[Steven E. Protter]

The message may be quite normal. If you have hung a device off the card that can't fully utilize the cards speed,perhaps an older scsi hardware item, the message is nothing to be concerned about.

If however you have an Ultrium tape drive hung on the thing, you have a major throughput issue that will make backups painful and slow.

So, I recommend that you look at those nice ioscan reports and compare them to your own notes or visuali inspection of the system and decide whether or not you have a problem.

If you do, tell us something about the device on the scsi card and we will try and help further.

Also, note that you need not terminate modern scsi devices. The aforementioned Ulrium drive is self terminating. If you put a terminator on it, it will act very flakey, might even bring down your system.

SEP