Date: Tue, 5 Aug 1997 10:33:31 +0930 (CST) From: Greg Lehey <grog@lemis.com> To: msmith@atrad.adelaide.edu.au (Michael Smith) Cc: scrappy@hub.org, msmith@atrad.adelaide.edu.au, freebsd-chat@FreeBSD.ORG Subject: Re: Sysadmin levels today? Message-ID: <199708050103.KAA18924@freebie.lemis.com> In-Reply-To: <199708050046.KAA24990@genesis.atrad.adelaide.edu.au> from Michael Smith at "Aug 5, 97 10:16:25 am"
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Michael Smith writes: > The Hermit Hacker stands accused of saying: >> On Fri, 1 Aug 1997, Michael Smith wrote: >> >>> Yeah. Not to mention that you can put 8 LUNs on each unit, which >>> makes the correct answer 57 or 121 respectively. >> >> Damn, I forgot about that...I've never actually *seen* this done >> though...what sort of 'max' has anyone seen hanging off of one scsi bus? > > Hmm, I've seen a bus entirely populated with MD21's, so 14 disks, and > one with four 5-tape units for 20 tape drives. I've also seen a > controller that would let you put four SMD disks on a single SCSI ID > at separate LUNs (in a Sequent, I think), so you can imagine what 28 > 1GB SMD disks would look and sound like 8) > > Still, the basic problem is the bus bandwidth; it's just not up to > that sort of load. You're jumping to conclusions here (or keeping some details quiet :-) The required bandwidth depends on the application, not the number of devices on the bus. Greg
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