Hi Guys
Just looking for some thoughts.. This kind of sits between hard drives / raid cards and workstations to I put it in here..
I am in the process of wiring my workstation up I have 12x spinners 4x SSD. To keep things tidy I have got a heap of sata and molex connectors to modify the PSU power lines.
My intention was to use 1 line to power 8 drives, however the startup current is giving me some concerns. The cable is 18awg - no more than 2 ft long, apparently the cable is good for 16amps max in free air. Hitachi rate the 7k3000 ultrastars at 2a @12v max on spin up, so I would be pulling 16a for around 4 seconds.. then the worst case scenario is 90.4w of load if they are all reading / writing at the same time - split between 5 and 12v on the line. which should be doable
The other line will power 4x spinners and 4x ssd and an optical. This leaves a molex line to power fan controller and any other ancilliaries I may put in..
The drives are going to be connected to a p420 or p822 and i cannot find anything about staggered startup.. which would save my issue.. if anyone knows if this is supported, that would be helpful.
Otherwise, what are your thoughts about loading for the 4 odd seconds at about the cables maximum?
Steve
Just looking for some thoughts.. This kind of sits between hard drives / raid cards and workstations to I put it in here..
I am in the process of wiring my workstation up I have 12x spinners 4x SSD. To keep things tidy I have got a heap of sata and molex connectors to modify the PSU power lines.
My intention was to use 1 line to power 8 drives, however the startup current is giving me some concerns. The cable is 18awg - no more than 2 ft long, apparently the cable is good for 16amps max in free air. Hitachi rate the 7k3000 ultrastars at 2a @12v max on spin up, so I would be pulling 16a for around 4 seconds.. then the worst case scenario is 90.4w of load if they are all reading / writing at the same time - split between 5 and 12v on the line. which should be doable
The other line will power 4x spinners and 4x ssd and an optical. This leaves a molex line to power fan controller and any other ancilliaries I may put in..
The drives are going to be connected to a p420 or p822 and i cannot find anything about staggered startup.. which would save my issue.. if anyone knows if this is supported, that would be helpful.
Otherwise, what are your thoughts about loading for the 4 odd seconds at about the cables maximum?
Steve