From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mikko Saukkoriipi Subject: Re: powersupply for 16disks +dual xeon Date: Sun, 02 Feb 2003 17:51:08 +0200 Sender: linux-raid-owner@vger.kernel.org Message-ID: <3E3D3E6C.1060602@msaukkor.cjb.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Stephan van Hienen wrote: >today tried to put 16 disks (15*ide7200 +1*scsi7200) in a intel sc5200 >case >(which has an 450W powersupply) > >when i try to powerup the system, the powersupply goes off after 3 seconds >i think this is because off the spinupp for the disks > >any tips how to fix this ? >(as far as i know there is no spinup delay for ide disks) >maximum powersupply i found is 550W, not much more than i have in my >system > >(i need an 24pin xeon powersupply) > >(disks are WD180GB (which asks 15W for spinup) >- >To unsubscribe from this list: send the line "unsubscribe linux-raid" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html > > More important than getting larger wattage powersupply is to find one that can provide enough power on the 12V rail. All powersupplies are really not built the same. I have a cheap and shitty 450W Q-tec powersupply in my server with 7 harddrives. It kept crashing when copying between harddrives. I found Firingsquad's powersupply guide(1) and calculated that my server requires 20A on the 12V rail, but the powersupply could only deliver 12A/15A Max. Now I have 2 AT powersupplies for the harddrives, but this is not a good solution. My friend recently bought a 465W Enermax that can provide 33A in the 12V rail. What I've seen, Enermax PSUs provide most power to the 12V rail. Fortron-Source top-end models would be another possibility, like FSP550-60PLG. Miksa