With our 4TB Seagate drives we draw about 500 watts/pod. This is for full pods which are not heavily
used/access. Power draw goes up 10-20% under heavy use. We supply this power with a single
30A/208V circuit which provides 6,240 watts of power with 80% of that usable (4,992 watts).
A rough estimate for power usage would be something like around 2 amps per pod depending on which types of drives you’re using. Higher power drives = Higher amps per pod. Lower power drives = Lower amps per pod. Each pod is somewhere around 400 -> 500 watts of power.
The A-540 does not support hardware RAID, but, with a software RAID, you can setup as many Arrays as your software and quantity of drives allows. Since the software is designed to manage replicating the files, the controller just passes the ATA commands to the drives. We have had good luck using Mdadm when setting up software RAIDs, if using Linux.
The Storage Pod 6.0 throughput depends on the type of drives, RAID configuration, IO block size. You will be able to calculate the numbers base on the configuration and applications. Here are some links for reference:
As shipped the pods are not configured as iSCSI SAN devices, they are full storage servers running Debian 8. That said I’m sure you could implement packages to create that functionality (using something like this: https://wiki.debian.org/SAN/iSCSI/iscsitarget)
The pod comes with factory installed Debian 7 if customer buy the fully assembled system. The pre-installed OS has very basic configuration and limited software packages. However customers can customize the OS even refresh the boot drive with any Linux distros or Windows as their desired. The pod kit may has boot drive but no pre-installed OS.
Boot disk is directly connected on the SATA port on the motherboard. There are plenty of free SATA ports on the motherboard. The SATA power cable comes with the power supply can support up to 3 SATA drives. Physically connect mirrored boot drives shouldn't be a problem, no matter spin HDD or SSD. But customers have to tweak it and the performance does not guarantee. Typically boot drive shouldn't be a bottleneck, after boot up the OS will not access the boot drive much. As long as system running there is no need to boot up. So SSD boot drives may not increase much more performance.
The wiring harness may or may not work with other models or other vendor's modular power supplies. Customers can compare the power supplies' manual for details of the connector type and pinout. Here is the link of the pod 6.0 Step by Step Assembly Instructions. Page 12, 13, 14 & 16 showing the power supplies' connectors used in pod 6.0.