From mboxrd@z Thu Jan 1 00:00:00 1970 From: david@lang.hm Subject: Re: limits on raid Date: Mon, 18 Jun 2007 14:56:10 -0700 (PDT) Message-ID: References: <18035.23867.576212.859440@notabene.brown> <4676BEC2.7090809@redhat.com> <20070618180327.GP10008@csclub.uwaterloo.ca> <20070618183324.GL10006@csclub.uwaterloo.ca> <4676D8DE.3050903@redhat.com> <20070618214633.GA15468@animx.eu.org> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Return-path: In-Reply-To: <20070618214633.GA15468@animx.eu.org> Sender: linux-raid-owner@vger.kernel.org To: Wakko Warner Cc: Brendan Conoboy , Lennart Sorensen , Neil Brown , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org List-Id: linux-raid.ids On Mon, 18 Jun 2007, Wakko Warner wrote: > Subject: Re: limits on raid > > david@lang.hm wrote: >> On Mon, 18 Jun 2007, Brendan Conoboy wrote: >> >>> david@lang.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