Zalman HS2 Mini-review
I received the HS2 this week and built out the server. This is my first unRaid build but one of dozens of builds for Linux boxes. The first impression for the case is that it is beautiful. Clean lines and good thinking are evident in all aspects.
The airflow in the case seems to be excellent: filter on the bottom under the PSU, vents and 120 mm fans at the top of the back and back of the top. I augmented the included 92mm fan on one drive enclosure with one (not included) for the second enclosure. Even during parity build, my drives are sitting around 31C. At other times, they have been at 28-29C.
The drive bays are the best and worst qualities on this case. These are not professional quality enclosures. Let me repeat: not professional quality. However, they are functional and cheap. When I say cheap I mean that I spend about $170 for the case and the two included 3-in-3 SATA enclosures. The enclosures are plastic and will not take heavy usage. However, I knew this when I bought it. I did not see them as a cheap alternative to a $100 4-in-3 enclosure but as a more functional alternative to cheap 4-in-3 mounts like the Cooler Master drive caddy. For users that will not be moving drives a lot, the six removable trays offer a lot of flexibility with ample airflow. As an added benefit, the power connections for the enclosures are 4-pin molex power adapters. This means I get away with a cheaper PSU and less cabling because the enclosures only take 4 cables each (3 SATA + 1 4-pin power).
Pros:
Excellent build quality and design on the case itself.
Good price $170 for six bays of removable caddies
Excellent airflow with the included fans, easily upgraded by predrilled spots for 2 additional 12mm fans (bottom and top) and one additional 92mm fan (for back of the second enclosure)
Padding on one side panel, padded mount point for PSU to reduce noise
About the cheapest way to get a high quality case and enclosures if your goal is 6-9 drives
Cons
Retention mechanism for drives is prone to sticking
LEDs for drives only indicates connection, not activity
They could have included more fans but it may be cooling well enough as-is (I have yet to install the additional 12mm fan I purchased because it is so cool and quiet as-is)
Result
I recommend this case for builds requiring 6-9 drives (Zalman sells extra enclosures for roughly $60) that will not be moved a lot.