Date: Fri, 06 Mar 1998 10:02:52 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: (marino.ladavac@siemens.at) <lada@ws2301.gud.siemens.at> Cc: hackers@FreeBSD.ORG, julian@whistle.com, wilko@yedi.iaf.nl, dmlb@ragnet.demon.co.uk Subject: Re: SCSI Bus redundancy... Message-ID: <XFMail.980306100252.shimon@simon-shapiro.org> In-Reply-To: <199803060729.IAA29905@ws6423.gud.siemens.at>
next in thread | previous in thread | raw e-mail | index | archive | help
On 06-Mar-98 marino.ladavac@siemens.at wrote: ... > 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. Nope. There are ISPs and there are ISPs. All the larger ones I visit are taking their availability very seriously. Many are already on 48VDC. Many co-locate equipment in NAPs and switching centers, which comply with Telco standards. Consifer a small ISP with, say 5,000 accounts which loses power during ruch hour. Can you count the number of support calls? Consider a web server with 2,000 virtual servers. Many used for OLTP, thus directly generating revenue. If I had my business run on such a server, I sure would demand it is imunne to power glitches. I found FreeBSD being seriously deployed, or considered for deployment serving 5,000 accounts and up. All the way to 200,000 account (takes more than 1 FreeBSD machine to do that :-). > 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). Wrong again. Diesel generators have a 15-180 seconds switch over time. You use the diesels to feed the battery chargers. The battery packs are impressive. If you are in the Portland Oregon area, call me and I'll take you to a small switching center. Fascinating to see. There ARE many ISPs who are still hacking it. A lump of PCs, SPARCS, and whathaveyou on picnic tables and Sportster modems stacked on each other (Hey, I ran my local ISP service that way :-), etc. But they will either change or disappear as the role Internet plays in our life. Internet, in this context is an alias to a TCP/IP network, public, private, or otherwise. Simon To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?XFMail.980306100252.shimon>