Date: Sat, 7 Mar 1998 01:18:41 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: lada@ws2301.gud.siemens.at Cc: dmlb@ragnet.demon.co.uk, shimon@simon-shapiro.org, wilko@yedi.iaf.nl, julian@whistle.com, hackers@FreeBSD.ORG Subject: Re: SCSI Bus redundancy... Message-ID: <199803070118.SAA25810@usr09.primenet.com> In-Reply-To: <199803060729.IAA29905@ws6423.gud.siemens.at> from "marino.ladavac@siemens.at" at Mar 6, 98 08:29:58 am
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[ ...High Availability and ISP's... ] > > the dam... I recommend 2 separate UPSs for the two inputs. True HA should > > be on 48VDC, separate packs, separate feeds. Standard Telco stuff. > > And then you find yourself in the middle of a nuclear blast... > > Honestly, don't you think you're overdoing it a bit here. I mean, we're > still talking ISP, right? If the power goes, your modems are dead as well. > And if you want to UPS that, you're using motor-generator pairs with Diesel > backup and don't really care about batteries (a 30 year old Diesel still > kicks in within a second and if your power supply cannot stand a few second > intermittent failure then you have some seriously underdimensioned power > supplies). The point here is in the US, we are starting to think very seriously about the concept of "Internet dialtone" (well, some of us are), and come hell or high water, the packets must flow... If you are going to claim to be a common carrier, like the telco, then you need to *act* like a common carrier in terms of reliability. Other than overcommitted tone generators and DTMF decoders in the case of a state of emergency (ie: the last earthquake of 6.x or higher), I have *never* had an interruption of phone service. My power goes out with much greater frequency than my phones ever have. I think if an ISP isn't part of the communications infrastructure, he'll be replaced by one of his competitors who is. Reliability is starting to be one of the top line items people (at least in the US) are using when choosing an ISP, now that pricing is starting to fall into specific ranges for specific service offerings as the ISP competition space gets saturated. ISP services are becoming a commodity. Try thinking of it this way: if you have a site selling cars that's not on an HA server, and your competitor has one that is on an HA server, and you have a power outage in your part of California, who is the guy in New York going to buy through, the server that's down or the server that's up? Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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