On 3/30/20 12:56 AM, saipan59 (Pete) wrote:
Maybe the rack was originally for HP computer systems, they had
deeper SCSI storage cabinets.
An anecdote: The last few years of my career with HP/HPE Storage, I was
the EE for a SAS-3 JBOD shelf. The main PCB is primarily a SAS expander
chip with SAS etch going to the front of the box for the drives, and to
the back of the box for the SAS cable connectors. The folks who decide
the "physical" aspects of the product insisted that the box had to be
rather deep, so that when mounted in a rack with servers, it would be a
similar depth, for ease of access to the SAS connectors and such. But
that Requirement meant that the main PCB had to be quite long, creating
signal integrity issues. As a result, we had to use an expensive PCB
material that added significant cost to the box. Nobody (of importance)
wanted to consider different cable design or chassis design options that
would have allowed a shorter board.
Wow Pete, I didn't know you were involved with that stuff. Very cool.
I just brought up an MSA50 not long ago, was that the model you worked on?
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Dave McGuire