Date: Thu, 05 Mar 1998 12:15:21 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: Duncan Barclay <dmlb@ragnet.demon.co.uk> Cc: Wilko Bulte <wilko@yedi.iaf.nl>, julian@whistle.com, hackers@FreeBSD.ORG Subject: Re: SCSI Bus redundancy... Message-ID: <XFMail.980305121521.shimon@simon-shapiro.org> In-Reply-To: <XFMail.980305080650.dmlb@computer.my.domain>
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On 05-Mar-98 Duncan Barclay wrote: ... > Are you sure you guys want to use different phases of a the same feed? > Remember > all two or three phases come into the building from the same sub-station > down > the same pice of cable. Most comman fault is a digger cutting this > cable taking out all three phases or temp. shorts in the > overheads to the sub-station (auto reset ater a couple of minutes; > usually > from wind blowing the cables together). > > You need feeds from seperate sub-stations. And then snow levels the cables from the power plant, or a flood destroys the dam... I recommend 2 separate UPSs for the two inputs. True HA should be on 48VDC, separate packs, separate feeds. Standard Telco stuff. ---------- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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