I've just added some new shelves to a (7-mode) filer pair, bring them up to two stacks of 10 shelves.

I'm trying to get 'autoassign' working, and it isn't.

I have:
- swapped drives such that each 'head' has only disks from one 'stack'.

Head 1 has 0a/5b

Head 2 has 5a/5d

I've had to manually trigger a small number of 'replace' operations.
And then switched on autoassign in the options.

I _think_ that should be it, but ... there's something I'm missing, because autoassign isn't working.

Does anyone have suggestions for why this might be, or what else I could check? (I'm wondering if there's a misassigned but 'failed' drive that otherwise isn't showing up?)