On Fri, 2011-12-30 at 13:16 +0100, Mattias Wadenstein wrote: > On Fri, 30 Dec 2011, Mikael Abrahamsson wrote: > > > On Thu, 29 Dec 2011, Jeremy Thompson wrote: > > > >> I thought about this as well - I have an Enermax 450 in there right now... > >> I'll have to look for a higher watt power supply next I guess. > > > > Also look at how your feeds are balanced. Some PSUs have two rails, putting > > all drives on a single rail causes your load handling capacity to go down > > significantly. I recommend getting a single rail PSU as well, well above the > > capacity you think you need. > > Not only that, take a good look at both the 5V and 12V specs, and compare > them to the draw needed by the drives (and the rest of the system). I've > found that the ammount of 5V available varies lots between PSUs, without > much correlation with the 12V supply. Which is fine for modern CPUs/GPUs > which mostly uses 12V, but drives seem to want quite a bit of 5V too. > > One other common problem with multiple rail PSUs is that often all the > useful power connectors (sata/molex) are only on one rail. I wouldn't mind > multiple rails if I could actually use all of them for drives. > > For the 24-drive home build I've done, I've actually ended up running two > PSUs in parallel (joining ground), but this is hardly something to > recommend to anyone sane. ;) I can give you my recommendation for a power supply based on my box. The box has 22 drives (all 7200), dual core Phenom II, 8 Gig ram. The PS is a OCZ ModXstream Pro 700. It has been running for over a year without showing any problems. In a normal steady state the box draws 260 Watts from the wall as measures by a Kill-A-Watt device. K -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
