--- On Mon, 30/3/09, Goswin von Brederlow <goswin-v-b@web.de> wrote:

From: Goswin von Brederlow <redacted>
Subject: Re: Adding more drives/saturating the bandwidth
To: Jon@eHardcastle.com
Cc: linux-raid@vger.kernel.org
Date: Monday, 30 March, 2009, 4:40 PM
Jon Hardcastle [off-list ref] writes:

quoted

Hey guys, How do you know if your machine can handle

adding some more drives to it? How can you check that there
is enough BUS IO to handle extra sata cards and also that
the machine is powerful enough to support say an 8 drive
raid 5...

A) Try & error.
B) look up the speed of the bus and half it. Any bandwidth
left?
   make sure the cpu isn't at 100% already as well

MfG
        Goswin

Cheers guys, I dont think CPU will be an issue as when i looked yesterday whilst copying to my 6 drive raid 5 array it was at ~10% (the only time i get access issues is when i am smart checking all 6 discs and trying to stream a movie of it at the same time!)

As for try and error... sounds scary as once I have added a drive to the array I can undo the process! I suppose I could add them as JBOD's and then thrash the hell out of them.. whilst accessing the rest of the array... What does halving the bus speed tell me in anycase?


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N: Jon Hardcastle
E: Jon@eHardcastle.com
'..Be fearful when others are greedy, and be greedy when others are fearful.'
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