X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m20.mx.aol.com ([64.12.137.1] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 986939 for flyrotary@lancaironline.net; Tue, 07 Jun 2005 01:05:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.1; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m20.mx.aol.com (mail_out_v38_r1.7.) id q.1c4.29d3f564 (4246) for ; Tue, 7 Jun 2005 01:04:18 -0400 (EDT) From: WRJJRS@aol.com Message-ID: <1c4.29d3f564.2fd684d2@aol.com> Date: Tue, 7 Jun 2005 01:04:18 EDT Subject: Re: [FlyRotary] Re: EC2 dual power feeds To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1118120658" X-Mailer: 9.0 SE for Windows sub 5012 -------------------------------1118120658 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 6/6/2005 5:10:59 PM Pacific Standard Time, jwvoto@itlnet.net writes: In order to have truly redundant EC2s would require a 3rd CPU to monitor the two controllers and automatically switch the failed unit off. Then what is going to monitor the 3rd computer? Wendell As a little side interest the guys at Mistral are using a computer that does exactly that. That is, it automatically switches between computers at failure. Expensive but nice for certification. There is a test circuit that checks BOTH ecu's before startup. Bill Jepson -------------------------------1118120658 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 6/6/2005 5:10:59 PM Pacific Standard Time,=20 jwvoto@itlnet.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0000ff size= =3D3>
In order to have truly redundant EC2s would req= uire a=20 3rd CPU to monitor the two controllers and=20 automatically switch the failed unit off.  Then what is going to moni= tor=20 the 3rd computer?
Wendell
As a little side interest the guys at Mistral are using a computer that= =20 does exactly that. That is, it automatically switches between computers at=20 failure. Expensive but nice for certification. There is a test circuit that=20 checks BOTH ecu's before startup.
Bill Jepson
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