It looks like they're doing 2u half width nodes, so I'd strongly suspect each node is 1TB of ram, one epyc 7713p, and 10 3.2TB u.2/u.3 drives.
eta: also suspect 30TB total just means they're leaving 64GB ram for the hypervisor OS on each node.
eta: also suspect 30TB total just means they're leaving 64GB ram for the hypervisor OS on each node.
Btw. if I count correctly, they have 20 SSD slots per node (if a node is full width) and 16 nodes. They would need 2 TB to reach 1 PB of "raw" capacity with the obvious redundancy overhead of ~ 20%.
It is also quite possible, they don't use ZFS at all and use e.g. Ceph or something like it but I don't think that is the case, because that wouldn't be cantrillian. :-) E.g. using Minio, they can provide something S3 like on top of a cluster of ZFS storage nodes too but they most likely get better latency with local ZFS and not a distributed filesystem. Financial institutions especially seem to be part of the target here and there latency can be king.