System Manager will create FlexGroup member volume counts based on the size of the FG.
It won't let you create member volumes smaller than 100GB (recommended min size of member vols), so if you created a FlexGroup that's under 300GB you'd get 2 member volumes.
If you created a 100TB FlexGroup, it would max out at the number of affinities available across the node's aggregates (up to 8 per aggr on higher end nodes, 16 max per node across two aggrs; 4/8 on lower end nodes).
The CLI is hardcoded to do 8 (for now); that will change in later releases and used a more intuitive approach similar to System Manager.
TR-4571 is a good place to learn about these:
https://www.netapp.com/us/media/tr-4571.pdf
It also shows the CLI command for controlling the member volume counts (-aggr-multiplier is the option)
-----Original Message----- From: Toasters toasters-bounces@teaparty.net On Behalf Of Rue, Randy Sent: Wednesday, April 28, 2021 5:39 PM To: Toasters toasters@teaparty.net Subject: is there any way to change the number of constituent volumes in a flexgroup?
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Hi All,
After some time playing with flexgroups it appears they're pretty much just a RAID0 stripe of flexvols, or something like a linux LVM construct.
I keep stumbling over the fact that if I create a FG from the webUI it spans my two data aggrs and creates two constituent volumes, but if I use the CLI the default "span count" is four and I get 8 CV's. 8 would be better as we expect to have a third aggr fairly soon if not more.
Is there any way to change the number of CV's in an existing FG? If this really is essentially a RAID0, I can see why not. I've tried a flexclone, but when I split it off I get an identical FG. If I try to snapmirror the FG from the webUI it doesn't allow me to connect to an existing FG or to set any parameters on the created volume.
In this case I've already created and loaded a 4TB FG that I now see only has two CV's. I could destroy it and start again but it seems probable I'll face this situation some day that I don't want to have to copy over.
Thanks in advance,
Randy in Seattle
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