From mboxrd@z Thu Jan 1 00:00:00 1970 From: david@lang.hm Subject: Re: limits on raid Date: Tue, 19 Jun 2007 12:28:02 -0700 (PDT) Message-ID: References: <18034.479.256870.600360@notabene.brown> <18034.3676.477575.490448@notabene.brown> <20070616020320.GB2002@animx.eu.org> <18035.23867.576212.859440@notabene.brown> <4677F14A.5060909@cfl.rr.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Return-path: In-Reply-To: <4677F14A.5060909@cfl.rr.com> Sender: linux-raid-owner@vger.kernel.org To: Phillip Susi Cc: Brendan Conoboy , Lennart Sorensen , Neil Brown , Wakko Warner , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org List-Id: linux-raid.ids On Tue, 19 Jun 2007, Phillip Susi wrote: > david@lang.hm wrote: >> one channel, 2 OS drives plus the 45 drives in the array. > > Huh? You can only have 16 devices on a scsi bus, counting the host adapter. > And I don't think you can even manage that much reliably with the newer > higher speed versions, at least not without some very special cables. 6 devices on the bus (2 OS drives, 3 promise drive shelves, controller card) >> yes I realize that there will be bottlenecks with this, the large capacity >> is to handle longer history (it's going to be a 30TB circular buffer being >> fed by a pair of OC-12 links) > > Building one of those nice packet sniffers for the NSA to install on AT&Ts > network eh? ;) just for going back in time to track hacker actions at a bank. I'm hopeing that once I figure out the drives the rest of the software will basicly boil down to tcpdump with the right options to write to a circular buffer of files. David Lang