Reconfiguring An Lcu With Larger Capacity 3390 Volumes; Increasing The Number Of 3390S Formatted Within An Lcu - IBM DS8000 User Manual

v Only define the actual base and alias devices to IOCP or HCD to avoid
v Only define the unit address range to IOCP or HCD as necessary for the
IBM recommends that you document the configuration you define for the DS8000.
With the exception of the 3380 and 3390 models, the DS8000 configuration and the
IOCP input must match.
Note: The CU device is a 2107/242x for any DS8000 device type. In HCD you can

Reconfiguring an LCU with larger capacity 3390 volumes

Complete this task to reconfigure an LCU with larger capacity 3390 volumes.
To retain your data, you must offload the data from the address range of the ranks
to be reformatted by performing the following steps:
1. Confirm the raid ranks that are associated with the address range that is being
2. Vary the address range offline. This causes any associated parallel access
3. Issue Devserv (DS QP,xxxx,nnnn) using the alias addresses to confirm aliases
4. Undefine the raid rank to allow the configuration of larger capacity volumes.
5. Reassociate the PAVs.
6. Vary the base address range online.
7. Issue Devserv (DS QP,xxxx,nnnn) using the base addresses to confirm that the
8. Restore the data that you offloaded.

Increasing the number of 3390s formatted within an LCU

Complete this task to increase the number of 3390s that are formatted within an
LCU.
To increase the number of 3390s that are formatted within an LCU, perform the
following:
1. Define an input/output definition file (IODF) using HCD with the desired
2. Remove the parallel access volumes (PAVs) using the DS8000 CLI.
3. Issue Devserv (DS QP,xxxx,nnnn) to the alias addresses to initiate an I/O
4. Activate a new IODF by either performing an IPL or by dynamically activating
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DS8000 User's Guide
unnecessary definition of processor subchannels.
installed devices in an LCU (64, 128, or 256). Defining the unit address range
enables you to put more LCUs and devices on a channel path.
use 3990 as a control-unit type for 3380 and 3390 devices. However, you
must use 2107/242x as the control-unit type for 3380B, 3380A, 3390B, and
3390A devices.
modified.
volumes (PAVs) to become unbound.
are unbound.
aliases are bound.
device addresses.
operation.
Note: Messages "IOS017I ALIAS DEVICE adev IS UNBOUND" and "IOS001E
xxxx, INOPERATIVE PATH" are issued from all the alias addresses.
These messages are normal and are not cause for concern.
the new IODF.