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HP 3000 MPE/iX Computer Systems > Chapter 2 System Information and Preparation

2.4: Special Note on SCSI Device Configuration for MPE/iX 6.0

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Upgrading a Pre-997 Corporate Business Server to a 997

New MPE/iX Release Obsolescence Strategy

by Ruben Gallegos
Commercial Systems Division

Overview

With the release of MPE/iX 6.0, all SCSI devices must have as part of their device configuration a pseudo device with a "transparent_mgr" that was created with SYSGEN. This requirement is for all SCSI devices on a system running MPE/iX 6.0.

Future I/O technology requires the consistent usage of "transparent_mgr" in the base MPE/iX I/O configuration.

The default configuration files that are part of the factory System Load Tape (SLT) all have the "TRANSPARENT_MGR" requirement built into the device configuration for all SCSI devices.

Today, all systems with SCSI devices should already be configured with the "transparent_mgr" requirement except for Magneto-Optical(MO) Devices. Previous MO installation instructions disallowed "transparent_mgr" in their configuration.

If you are performing an UPDATE to MPE/iX 6.0 or are using your archived configuration files when performing an INSTALL, you must check and ensure that each SCSI device has a "TRANSPARENT_MGR" in its device path, prior to performing the UPDATE or INSTALL. Failure to perform this step will cause problems that could lead to inability to access data on the SCSI device.

The remainder of this article provides some examples for configuration of SCSI devices on HP3000 systems. As with most devices on the HP3000, SCSI device configuration is done via SYSGEN. The actual entries made in SYSGEN are dependent upon the device rather than the I/O architecture (CIO, hybrid or Precision Bus).

On the HP3000 the requirement for configuration of SCSI devices is to actually make two path entries per device. The first entry is the pseudo device entry for the "TRANSPARENT_MGR." This entry is not a logical device itself; rather, it is a place holder required by the SCSI Device Manager Software. The second entry is for the actual device itself. This is true for CIO, "hybrid" or Precision Bus systems even though these systems use different SCSI controllers.

In the past there was only one set of devices that did not follow this convention, Magneto-Optical Devices. With the release of MPE/iX 6.0, Magneto-Optical devices must also make use of pseudo devices in their configuration. You must add pseudo devices for the MO Autochanger and MO disk drives. Not adding pseudo devices for an MO device on MPE/iX 6.0, will cause problems that could lead to the inability to access data from this device.

Examples:

Pre-MPE/iX 6.0 Configuration

All SCSI devices, except Magneto-Optical devices should have a "transparent_mgr" configured in systems running MPE/iX versions prior to MPE/iX 6.0.

This example shows the standard MPE/iX 5.5 SCSI device configuration, for a C1700A 20GB Magneto-Optical Jukebox. This library is actually made up of an Autochanger and two disk drives, resulting in three LDEVs associated with this library. Notice that the 'TRANSPARENT MANAGER' is not used with any of these devices. Notice also that this happens to be a Precision Bus system. 

 PATH:  24                                     LDEV:
   ID:  A1703-60003-SCSI                       TYPE: DA
 PMGR:  SCSI_DAM                            PMGRPRI:     6
 LMGR:                                       MAXIOS:     0

 PATH:  24.3                                   LDEV:   31   ^
   ID:  HPC1700A                               TYPE: AC     |
 PMGR:  SCSI_AC_DM                          PMGRPRI:    10  |
 LMGR:  LOGICAL_DEVICE_MANAGER               MAXIOS:     0  | These 3
                                                            | Logical
 PATH:  24.4                                   LDEV:   32   | Devices
   ID:  HPC1701A                               TYPE: DISC   | represent
 PMGR:  SCSI_DISC_DM                        PMGRPRI:     8  | 1 C1700A
 LMGR:  LOGICAL_DEVICE_MANAGER               MAXIOS:     0  | 20GBtye
                                                            | Device
 PATH:  24.5                                   LDEV:   33   |
   ID:  HPC1701A                               TYPE: DISC   |
 PMGR:  SCSI_DISC_DM                        PMGRPRI:     8  |
 LMGR:  LOGICAL_DEVICE_MANAGER               MAXIOS:     0  v

MPE/iX 6.0 Magneto-Optical Device Configuration

This example is the new/proper configuration for the C1700A 20GB Magneto-Optical Jukebox on MPE/iX 6.0. This device is made up of the Autochanger and two disk drives resulting in three LDEVs associated with this library. Notice that the 'TRANSPARENT MANAGER' must now be used with both the Autochanger and disk drives. Notice also that this happens to be a Precision Bus system. 

 PATH:  24                                     LDEV:
   ID:  A1703-60003-SCSI                       TYPE: DA
 PMGR:  SCSI_DAM                            PMGRPRI:     6
 LMGR:                                       MAXIOS:     0

 PATH:  24.3                                   LDEV:
   ID:  PSEUDO                                 TYPE: DA
 PMGR:  TRANSPARENT_MGR                     PMGRPRI:     6
 LMGR:                                       MAXIOS:     0

 PATH:  24.3.0                                 LDEV:   31   ^
   ID:  HPC1700A                               TYPE: AC     |
 PMGR:  SCSI_AC_DM                          PMGRPRI:    10  |
 LMGR:  LOGICAL_DEVICE_MANAGER               MAXIOS:     0  | These 3
                                                            | Logical
 PATH:  24.4                                   LDEV:        | Devices
   ID:  PSEUDO                                 TYPE: DA     | represent
 PMGR:  TRANSPARENT_MGR                     PMGRPRI:     6  | 1 C1700A
 LMGR:                                       MAXIOS:     0  | 20 GBtye
                                                            | Device
 PATH:  24.4.0                                 LDEV:   32   |
   ID:  HPC1701A                               TYPE: DISC   |
 PMGR:  SCSI_DISC_DM                        PMGRPRI:     8  |
 LMGR:  LOGICAL_DEVICE_MANAGER               MAXIOS:     0  |
                                                            |
 PATH:  24.5                                   LDEV:        |
   ID:  PSEUDO                                 TYPE: DA     |
 PMGR:  TRANSPARENT_MGR                     PMGRPRI:     6  |
 LMGR:                                       MAXIOS:     0  |
                                                            |
 PATH:  24.5.0                                 LDEV:   33   |
   ID:  HPC1701A                               TYPE: DISC   |
 PMGR:  SCSI_DISC_DM                        PMGRPRI:     8  |
 LMGR:  LOGICAL_DEVICE_MANAGER               MAXIOS:     0  v

MPE/iX 6.0 Tape Configuration

This example shows a standard SCSI tape device configuration. This form should be followed for all SCSI devices including Magneto-Optical Devices on MPE/iX 6.0. This particular example shows the configuration for the HPC1503B tape drive using the ID= HPC1503B. Notice that this happens to be a Precision Bus system. 

 PATH:  52                                     LDEV:
   ID:  A1703-60003-SCSI                       TYPE: DA
 PMGR:  SCSI_DAM                            PMGRPRI:     6
 LMGR:                                       MAXIOS:     0

 PATH:  52.0                                   LDEV:        ^
   ID:  PSEUDO                                 TYPE: DA     | Repeat
 PMGR:  TRANSPARENT_MGR                     PMGRPRI:     6  | for each
 LMGR:                                       MAXIOS:     0  | Physical
                                                            | Device
 PATH:  52.0.0                                 LDEV:    7   |
   ID:  HPC1503B                               TYPE: TAPE   |
 PMGR:  SCSI_TAPE_DM                        PMGRPRI:    10  |
 LMGR:  LOGICAL_DEVICE_MANAGER               MAXIOS:     0  v

MPE/iX 6.0 Disk Device Configuration

This particular example shows the configuration for the 2.0 GB version of the C302x disk using the ID= HPC3010M1 (the 1.0 GB version is HPC2247M1). Notice that this happens to be a CIO system. 

 PATH:  6/4.4                                  LDEV:
   ID:  HP27251A                               TYPE: DA
 PMGR:  CIO_SCSI_DAM                        PMGRPRI:     6
 LMGR:                                       MAXIOS:     0

 PATH:  6/4.4.6                                LDEV:        ^
   ID:  PSEUDO                                 TYPE: DA     | Repeat
 PMGR:  TRANSPARENT_MGR                     PMGRPRI:     6  | for each
 LMGR:                                       MAXIOS:     0  | Physical
                                                            | Device
 PATH:  6/4.4.6.0                              LDEV:   16   |
   ID:  HPC3010M1                              TYPE: DISC   |
 PMGR:  SCSI_DISC_DM                        PMGRPRI:     8  |
 LMGR:  LOGICAL_DEVICE_MANAGER               MAXIOS:     0  v


Upgrading a Pre-997 Corporate Business Server to a 997

New MPE/iX Release Obsolescence Strategy