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jacob
09-12-2002, 05:13 PM
i am working on rolling my own rack mounted raid
and have found the cheapest way to do it is to use a blank PC RAID case,
and don't put the motherboard in, just the drives and cables and such
however, the issue of the power supply is troubling me.
I assume that a 300W ATX powersupply would be ok for Seagate Scsi drives. Am I mistaken?
thanks

kaye
09-12-2002, 11:35 PM
My Burly with eight Seagate Cheetah X15's has a 300W power supply. Have at it. k

jacob
09-13-2002, 05:40 PM
so the ATX aspect of a the CPU power supply does not indicate that there is something specific to the power needed by a board
like some hz or amp thing?
just checking

thanks a lot

kaye
09-13-2002, 08:28 PM
Well, each power supply has individual max rated voltages for +5V DC, +12V DC, etc. I have a PowerTower Pro with a factory installed 300W PS. It's ratings:

Input 115V AC, 7.0A at 60Hz
Output DC 300W Max
?+5V??30A
+12V??12A
?-5V???0.5A
-12V???0.5A
+3.3V?15A

This PTP has run up to six hard drives, a CD-ROM drive, ZIP 100 drive, floppy drive, three internal fans, four hard drive fan systems, 1024MB RAM, motherboard, G3-500 processor, six PCI slots filled, all at the same time. I can't imagine you having trouble with a 300W power supply just for drives.

A single Generation 1 Seagate Cheetah X15 18GB, typical operating conditions:
Typical current 12V DC 1.05A
Startup current 12V DC 1.15A
Typical current ?5V DC 0.80A
Startup current ?5V DC 0.81A

Typical idle power 10.7W

So +12V DC and +5V DC are what operate the drives. The power supply you are looking at and the number of drives plus fans will give you an idea of what is required. k

jacob
09-14-2002, 12:55 PM
thanks--
puttng together my own rackmount raid is certainly a lot CHEAPER than buying one built. Its amazing.
That said, I will get the internela ribbons etc from Macgurus

If you folks ever get your sh*t back together. what happened anyway?

unclemac
09-15-2002, 02:25 AM
Does that mean there is no RAID controller in your generic case? So you are using Software RAID, right?

jacob
09-15-2002, 09:18 AM
i haven't put it together yet
I was planning on using softraid, yes,

Costa
09-17-2002, 10:35 AM
Dear Jacob,

I see that kaye has already posted you good info.

However, if you are looking for good PS (hoping not to make any injustice to the MacGurus site), I personally had very good experiences with Enermax EG series (http://www.enermax.com.tw/eg365p-ve-fma.htm) with double fans and 8 cm adjustable fan speed:
<UL TYPE=SQUARE>
<LI>very quite (on 50% fan speed < 25 dB)
<LI>very cool (excellent air flow inside the casing)
<LI>very good PS linearity
<LI>ATX form factor
<LI>Gold-plated connectors
<LI>Cable-Tube-Tied for neatness
<LI>Ideal for supplying a large number of devices simultaneously and for overclocking.
[/list]
My 2 worth.


------------------
Costa

Take it to the Max, Mac!

ricks
09-18-2002, 02:55 AM
Hey Costa,

?Welcome! Good advice and nice posting style. Don't worry about stepping on toes, true quality advice is always welcome.

Rick

Costa
09-18-2002, 06:44 AM
Hi Rick,

I thought of returning the favour... http://macgurus.com/infopop/emoticons/icon_wink.gif Your help on Apple's fora is always great!

Cheers.



------------------
Costa

Take it to the Max, Mac!

Damien
10-03-2002, 11:15 AM
Hi Costa!

------------------
Damien,



[This message has been edited by Damien (edited 03 October 2002).]

Costa
10-14-2002, 09:39 AM
Hi Damien!

So.... you're posting here aswell! Darn.... I am sorry to have missed you for more than 10 days. That shows you how sloppy I am.

Gotta find more time for this! http://macgurus.com/infopop/emoticons/icon_wink.gif

Cheers

------------------
Costa

Take it to the Max, Mac!

jacob
10-14-2002, 11:05 AM
would you guys friggin email each other? Geez, I keep getting messages that someone replied to the post.