Sound advice, but as  we waited for a call-back, many volumes finished up, and we were able to cancel further ones without trouble.  I guess the lesson is to queue up only a few operations at a time for a busy group.  I have no doubt those little ARM chips are working their hearts out for us, but note to Dell: it might be worth documenting or enforcing such limits...
Hello, I kicked off approximately 30 volume migrations from one pool to another.  Pool-1 is 3x PS6500E using 1TB drives, and pool-2 is 2x of the same.   As far as I can tell, the progress is OK, but slow.  I actually wanted to cancel a few of the moves, but receive "IPC error" from both the GUI and the CLI. Just wondering if anyone had any ideas before I file a case. Firmware 5.0.4. Cheers, Eugene
IPC error cancelling volume migrations