I am having trouble understanding what the -concurrent option on the symsnap create and activate acutally do. I need two sets of snap devices for each application. Rather than creating one device group with two sets of VDEVs for each STD, I have created two device groups, appSNAP1, and appSNAP2, each with the same set of STD devices and a different set of VDEVs. This makes it easier to get the VDEVs I want on a simple create, activate or terminate. I think I get the same result creating or activating the second set of VDEVs using the second device group regardless of whether or not I include the -concurrent option. I was thinking that maybe its because i am using two seperate device groups, and the concurrent option is irrelevant in this case. But I'm pretty sure that earlier in my testing when I was working with a single device group and two sets of VDEVs, I was gettting the same result without the -concurrent option, which I wasn't even aware of at the time.

I would appreciate any light that anyone can shed on this.