User guide

2.1 MDM Limitations
MDM tests internal devices in your system, but it performs limited diagnostics.
• MDM reads from each drive and checks each controller, but it does not
write to the drives because that could destroy data.
Note
MDM tests a tape or diskette drive only after the medium (tape or
diskette) is inserted into the drive.
• MDM checks devices on the system as well as the system and
interconnects.
• MDM checks terminal interfaces (but not terminals) by means of feedback
connectors.
If your devices pass the tests but you still experience problems, call your
Digital service representative for further testing.
If you require more complete diagnostic testing, purchase the MicroVAX
Maintenance Kit. That kit includes a system maintenance guide and the
service diagnostic tests. The MDM version you receive with your system is a
subset of the service version.
CAUTION
Only qualified service personnel should use the service diagnostic tests.
2.2 Preparing to Run MDM
Running MDM on some systems requires additional or special procedures:
Read Section 2.2.1 if you plan to run MDM on a diskless or tapeless
system.
Read Section 2.2.2 if you plan to install MDM on a hard disk or RF-series
Integrated Storage Element.
Read Section 2.2.3 if you plan to run MDM on a DSSI VAXcluster.
You can run MDM on an RRD-series disc drive by using the MDM CD–ROM
Kit.
2–2 Running the Diagnostic Monitor