decent interface for port-multiplied enclosures
I'm using this card in a dell t5610 running ubuntu linux 14.04. I use the card to connect 2 external enclosures, one 4-bay sans digital and one 5-bay sans digital, both loaded with 4tb hgst disks configured as zfs pools. I like the fis port multiplier support; it is transparent and shows disk information as expected. However, with a vantech 4-bay esata enclosure, the individual disks' smart information was inaccessible.I ran into an unusual problem where the external enclosures would rapidly loop through resets with a "read scr" error when i tried to access the disks therein even for simple zpool imports. I replaced the esata cables i was using with some separately-purchased esata cables with perhaps a slight improvement but no resolution of the basic issue. A comment on another esata controller review suggested that this could be caused by low power, but not to which component this was related. I reseated this controller in the "75w" pcie slot (#3 in the t5610 owner's manual) and everything worked at least on a surface level; disks come online with no errors or link resets on connection/mounting. The links do still hard reset during heavy read/write operations but at least they mount and the data is accessible. I wish the power requirement, if indeed it is true, were directly addressed by the manufacturer or included a connector to supplement the pcie power delivery.As reported by iotop, when the enclosures are not going through a link reset, read speeds seem to be sustainable at about 380 m/s and write speeds sustainable at about 100 m/s.