Architect wrote:
well, actually you can.
all new LDs would then be created according to the new parameters, and you would need to tune the CPG to restripe the old LDs to new ones with the new parameters.
not tuning would create an interesting mess, where volumes would be sitting on a mix of different LD types.
I actually had this happen, the tier-3CPG's in our primary AO policy had FC R6 as the config instead of the intended NL R6 and so we ran too low on FC space to perform our rebalance when we did our node expansion. I changed the CPG and tuned some of the vvols to a new CPG to immediately free up space so we could do the expansion, and then tunesys moved everything else over the course of several months but all of the vvols that I didn't immediately tune continued to have a mixed LD structure until the tunesys completed, including some that had both FC-R6 and NL-R6 in their tier-3, it did not cause any issues.