From: Jim Paris <jim@jtan.com>
To: Brad Campbell <brad@wasp.net.au>
Cc: Guy <bugzilla@watkins-home.com>,
comsatcat@earthlink.net, linux-raid@vger.kernel.org
Subject: Re: Busted disks caused healthy ones to fail
Date: Tue, 14 Dec 2004 16:49:46 -0500 [thread overview]
Message-ID: <20041214214946.GA23973@jim.sh> (raw)
In-Reply-To: <41BF4967.9000801@wasp.net.au>
> It's not that hard.
> I have 4 drives loaded in the rear bays and 2 x 5 Way SATA Hotswap bays in
> the 6 front 5.25 inch bays. 14 Drives. And yes, they are on a single 420w
> PSU along with the motherboard, Athlon XP 2600+. and 5 80mm fans. Not much
> else though.
!!!!!! Holy crap!
Let's pick a random typical hard drive, a Seagate 120GB SATA:
http://www.mittoni.com.au/catalog/product_info.php/products_id/1690
It lists maximum current draw as 2.8 A on the +12V line.
Multiply that by 14 drives and we get __39.2 amps__.
Now let's pick a random 420W power supply:
http://www.newegg.com/app/viewproductdesc.asp?submit=Go&description=N82E16817103445
Note how it's +12V output is rated for only __15 amps__.
Your numbers might differ a bit. But it is NO surprise that your
drives are failing. The surprising part is that they and your power
supply have worked this long.
-jim
next prev parent reply other threads:[~2004-12-14 21:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-14 6:42 Busted disks caused healthy ones to fail comsatcat
2004-12-14 6:55 ` Guy
2004-12-14 8:28 ` comsatcat
2004-12-14 14:11 ` Michael Stumpf
2004-12-14 22:34 ` comsatcat
2004-12-14 15:22 ` Guy
2004-12-14 20:13 ` Brad Campbell
2004-12-14 21:47 ` Guy
2004-12-14 23:54 ` Alvin Oga
2004-12-15 1:03 ` Guy
2004-12-15 1:23 ` Alvin Oga
2004-12-14 21:49 ` Jim Paris [this message]
2004-12-14 22:13 ` Guy
2004-12-15 4:46 ` Brad Campbell
2004-12-15 5:04 ` Guy
2004-12-15 5:22 ` Brad Campbell
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