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Atto FibreBridge and stack with SSD

Hi all,

reading at a recent copy of NetApp MetroCluster FAQ there's something not completely clear.

I read first:

SAS stack depth: 10 shelves per stack are supported, except if SSD is included in the stack. If SSD is

configured, the total stack depth is 4 shelves, of which a maximum of 2 (48 drives) may be SSD

shelves.

few rows later, I read

How many SAS shelves per stack can I have?

Answer: A maximum of 10 shelves per stack in Data ONTAP 8.1 and higher. Previously 8 was the limit.

An exception is where SSD is installed with the FibreBridge. In this instance, the maximum stack depth is

4 shelves, of which a maximum of 2 (48 drives) may be SSD shelves.

Well. Is this related to "pure SSD shelves" for all SSD aggregate or is this valid also for FlashPool aggregates?

So that, if I have in a stack a FlashPool aggregate somewhere the limit is 4 shelves for stack?

Regards,