Process to change MIM communication method from CTC to DASDONLY

Products

• MIM Resource Sharing (MIM)

Issue/Introduction

You need to change the communication method for MIM allocation and MIM integrity from CTC to DASDONLY.

CTC devices are being removed, thus CTCPATH statements will be removed from MIM parms.

Environment

Release : 12.5
Component : MIM

Resolution

Being that you want to get rid of the CTC's, you would have to

1. allocate new dasd control files
   • use yourhlq.CBTDJCL(ALLOCCF)
2. update the appropriate MIM parms to define the related ALLOCATE statements
   • ALLOCATE DDNAME=MIMTBL00,DSNAME=SYSSHR.MIM.MII.CF00
   • ALLOCATE DDNAME=MIMTBL01,DSNAME=SYSSHR.MIM.MII.CF01
3. remove the CTCPATH statements
4. modify the COMMUNICATION method
   • change COMMUNICATION=CTCONLY to COMMUNICATION=DASDONLY
5. shutdown MIM on all systems
6. start MIM on the first system with FORMAT=BOTH
7. start MIM on remaining systems with FORMAT=CKPT

Note: Since it is not generally recommended to shutdown MIM, you will have to coordinate this with either scheduled IPL's or at a time when the system activity is at minimum to prevent any potential integrity exposures.