Here is my summary of the 8mm tape drive that will not accept a tape.
The summary is at the end of the original message.
sd0: Sun 1.3G (All OS)
sd2: Maxtor P1-17S
sd4: Maxtor P1-17S
sd6: Maxtor P1-17S
The problem is that the 8mm tape drive gets in a state where it will not
accept a tape, any tape. Each time the tape is loaded into the drive, the
drive ejects it.
This will normally occur on one or two systems after the dump script has
run. /var/adm/messages will sometimes show "SCSI bus reset messages."
We have found two ways to recover from this state, 1) reboot, 2)
power cycle the tape drive.
mt -f /dev/rst0 status returns "no tape loaded or drive off line"
The dump script does nothing special, just mt commands, and dump commands.
The last command if mt -f /dev/rst0 rew. I have not seen the drive fail
in the middle of a dump.
I have seen this on more than one system, so I do not expect hardware.
Below is an extract of messages.
Please send replys to: firstname.lastname@example.org
I will summarize
---------------------End Original Message---------------------------
Thank you for your quick reply to my question. I recieved numerous suggestions
and ideas including:
clean the drive
try new tapes
try old tapes, because Sony made a change to the leader length on
Check SCSI cable lengths
Switch from video tapes to data tapes
Read/Write board may need to be replaced
tape head may need to be replaced
mole motor may need to be replaced
use standard device /dev/rst1
use the mt "offline" command
The proper answer for my problem was submitted by Jon Mellot,
email@example.com. He suggested that I check the PROM levels of my
It seems that when Exabyte sells a drive to a vender, they do not know how
it is going to be used. So they put a generic set of PROMs in the device.
This set of PROMs just does not work well with SunOS, and UNIX in general.
The error that we are seeing is called a "servo system" error. The only way
to clear this is to reboot, or to power cycle the drive. The new level of
PROM will also allow a "soft servo" reset by pressing the eject button
while the tape door is open. Also, the new level of PROM will help prevent
this problem from occuring in the future.
The new PROMs have not arrived yet, but if they function as advertised, they
will solve our problem. If the PROMs do not solve our problem, I will write
The old PROM levels were:
The NEW PROM levels are:
Again thanks to those who responded:
This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:06:41 CDT