MIA terminates with MIM2153E and MIM0002E during initialization

Products

• MIM Data Sharing (MII)
• MIM Tape Sharing (MIA)

Issue/Introduction

You encounter MIM2153E CANNOT MANAGE MVS AUTOSWITCHABLE DEVICE #### messages followed by a MIM0002E termination with reason code x'00000065' during MIM/MIA initialization. 

Cause

This issue occurs because tape devices are varied online prior to the MIM/MIA address space starting. When these devices are already online, MIA is unable to turn off the MVS auto-switching attribute. This restriction prevents MIA from successfully managing the devices, leading to the initialization failure and subsequent abend.

Resolution

To resolve this issue, you must ensure that all tape devices intended for MIA management remain offline until the MIM/MIA address space is fully initialized.

1. Review your IPL procedures and automation to identify where devices are being varied online.
2. Adjust your startup sequence so that MIM/MIA starts before any automation or manual commands vary these tape devices online.
3. Once MIM/MIA is active and managing the devices, you can then vary them online as needed. This is generally done within the MIMSYNCH member
4. Change the IOGEN to AUTOSWITCH=NO for all MIA managed devices. See KB article: Tape IOGEN AUTOSWITCH setting with MIA