I especially took notice of the following:
1.
The SSD boot drive is an excellent idea. Done right this becomes a drive that is primarily read and thus is a cheap way to beef up server performance.
Not really. It is far more effective at reducing energy costs when the bulk of your storage is off in the NAS/SAN (i.e. off the server). This way the OS drive which isn't doing much ( you shouldn't be heavily swapping more of the time) does nothing when they is nothing to do.
http://www.apple.com/xserve/performance.html [ go down to the disk section]
The SSD drive if want to pull/push alot of data is right in the same ballpark as the SATA drive. This is a SATA SSD drive. You can get nice random I/O response, but your OS should NOT be doing tons of random OS probes at the disk.
SSD are much better as a cache to the spinning drives or for doing tons of random I/O with block sizes that match their read/write block size.
2.
The Apple drive modules. Unfortunately this isn't something noted positively as one doesn't want to have to pay excessively for storage. Considering recent firmware problems in the industry I do understand a bit but it is excessive restrictions on customer flexibility in my mind. What if you want to through the latest and greatest SSD tech in there three months down the road? It is a mixed bag but alternative storage in these servers ought to be at the users discretion.
SSD on the PCI-e slot which isn't bounded by SATA/SAS speeds can have a bigger impact (if Mac OS had drivers for them).
http://news.cnet.com/8301-13924_3-10212989-64.html
so may not want to put them into Apple drive modules. The IOPs of SSD is in a different class that what is usually attached on SATA/SAS bus. Open question whether really want to use that bus for that in the future for latest/greatest SSD tech. It is nice to package as SATA since it is a driveless option, but that puts limitations on the drive.
Dell and HP have similar market segmentation for the drives that go into their server class boxes also.
If the limitation leads to substantially high likelihood of server uptime then most folks make that trade-off. Stick to the smaller subset of drives that the hardware vendor says is OK.
3.
The units have a nice port allotment but I'd like to see more USB ports. Especially one more at the front. The thing here is that USB devices have completely replaced just about everything else for file transfer that doesn't involve the network. Plus you still need a port for mouse and keyboard.
In a temporary, need a physical keyboard for some deep maintenance, context what is wrong with daisy chaining the mouse off the keyboard?
In norm mode nothing should be hooked to the USB slots on the front. If want to do KVM that is better to put in the back with the rest of the wires that permanently hang out the back of the box.
As for storage. The DVD ROM drive? If it is a specific file(s) that all the machines need after being restored, burn a disk and walk it around.
5.
Still running 10.5.x. This of course is both good and bad. It is hoped that Snow Leopard server would dramatically improve performance on the new Intel processors. It makes the suggestion that people wait for Snow Leopard plausable.
dramatic improvements. Not very likely. Some incremental a couple of percentage, yeah. But when has a new OS been 25-50% faster than the last one (that wasn't a complete dog.) ?