linux-kernel - Re: limits on raid

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Message-ID: <Pine.LNX.4.64.0706181453090.14890@asgard.lang.hm>
Date:	Mon, 18 Jun 2007 14:56:10 -0700 (PDT)
From:	david@...g.hm
To:	Wakko Warner <wakko@...mx.eu.org>
cc:	Brendan Conoboy <blc@...hat.com>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org
Subject: Re: limits on raid

On Mon, 18 Jun 2007, Wakko Warner wrote:

> Subject: Re: limits on raid
> 
> david@...g.hm wrote:
>> On Mon, 18 Jun 2007, Brendan Conoboy wrote:
>>
>>> david@...g.hm wrote:
>>>> yes, sorry, ultra 320 wide.
>>>
>>> Exactly how many channels and drives?
>>
>> one channel, 2 OS drives plus the 45 drives in the array.
>
> Given that the drives only have 4 ID bits, how can you have 47 drives on 1
> cable?  You'd need a minimum of 3 channels for 47 drives.  Do you have some
> sort of external box that holds X number of drives and only uses a single
> ID?

yes, I'm useing promise drive shelves, I have them configured to export 
the 15 drives as 15 LUNs on a single ID.

I'm going to be useing this as a huge circular buffer that will just be 
overwritten eventually 99% of the time, but once in a while I will need to 
go back into the buffer and extract and process the data.

David Lang
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