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Shawn Bodily's POWER/AIX/AI Blog

Remote Copy Relationship problem

While attempting to setup a replicated relationship between a FlashSystem FS5200 with code level (8.4.2.1) and a FlashSystem FS5300 with code level 8.7.0.2 we got the following error message:

CMMVC7176E The remote copy relationship could not be added to the consistency group because the cycling modes do not match.

Now the kicker is, via the GUI, when the task executed it just gave us the OK and when we went back there was no relationship showing in the list. So this was very confusing. So we did it again, then made sure we chose to View Details on the GUI screen executing the task, and that is what showed the error message.

Turns out this is because the new FS5300 does not have remote copy compatibility mode enabled.

To enable it as required, execute:

chcompatibilitymode -enable -feature remote_copy

IBM_FlashSystem:P10FS5300:superuser>lscompatibilitymode

feature            enabled in_use

remote_copy        yes     yes

multiple_io_groups no      no