Hello, 

I would like to use zHyperWrite functionality for MQ Active Logs operations and to be honest I did not find a way how to prove that it is really in use.

I believe all prerequisites from system and storage points of view are met and the CSQ6LOGP MQ ZPARM parameter ZHYWRITE is se to YES and it seems that the setting is done and all should work fine. But there are two points causing my uncertainty:

a) CSQJ167E message saying "ZHYWRITE(YES) specified but no active logs are zHyperWrite capable" and  

b) CSQJ370I message as a result of DIS LOG command where zHyperWrite=YES is reported in both cases .. when particular active log dataset is capable and is not capable.

I contacted our storage team with the first message but they confirmed to me that involved volumes are enabled for this feature.

Another strange thing is that I activated zHyperWrite for MQ on various LPARs and on some of them the message CSQJ167E appears and on some not even if the active logs datasets format seems to be the same.

Question is - are there any special requirement(s) for the MQ active log datasets format to be capable for zHyperWrite like e.g. must be VSAM extended or must be stripped or with the particular share option .. ? Maybe it could be needed to reallocate the active logs datasets to fit these special requirement but I was not successful to find this kind of information in MQ doc .. 

Would be nice to see if someone has a good experience with zHyperWrite feature activation for MQ. 

Thank you!

Best regards,

Radek Vanek, z/OS MQ System Programmer