The reason for using PCI Express is because Mini-ITX boards typically do not have PCI-X slots and as Mini-ITX only have one or two slots, I need one card to controll all 12 disks. Speed is not an issue for me, only capacity.
Anyone got any suggestions for a PCI Express card supporting both PM and Multilane for a minimum of 12 disks?
I'm struggeling to find a different storage rack to the Addonics which can do water cooling and i need this because I do not have good enough cooling where the kit is stored on a day-to-day basis, not for the noise the HDDs create.
Where you say "a single cable of the correct type would connect to a card in the storage case, SFF-8088 Mini SAS, on each side."
Its not really a card, it more of a cable that (normally) mounts in an expansion slot and accepts the external cable you listed and routs that to the expander. But you yes have the general idea. The expander can be part of the backplane as in the Supermicro solution or an independant device that would connect to a discrete solution as you are looking for and you listed the correct cables.
It is also possible to expand to other JBOD boxes from the first expander with most expansion solutions. This makes it possible to create some really large volumes. I just quoted a customer a 60TB solution for example.
Do you have the drives yet? If not I would encourage you to go with SAS drives for this solution. Not the expensive 10k or 15k ones but the Seagate es.2 series of SAS drives that are 7200 RPM and are priced inline with the SATA ES.2 drives. They come in 750GB and 1TB sizes and there may be others. If you need to use SATA drives that is OK, you just may be limited in the future with cascading if that were ever a need.
One other thing, the card you list as an example only does hostraid 0,1,10 so if you need RAID 5, 6 or 50, 60 you may want to look for another controller. Plus as much as I like Adaptec because the new 5 series and 2 series controllers are extrememly fast they do tend to run hot and I would not use them in a mini itx solution. You might want to look into this card (the 9690SA-4I4E version)