Date: Mon, 11 Dec 2000 18:35:08 -0500 From: Delanet Administration <admin@delanet.com> To: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>, "qmail@list.cr.yp.to" <qmail@list.cr.yp.to>, "vchkpw@inter7.com" <vchkpw@inter7.com> Subject: FreeBSD, Qmail, and NFS Message-ID: <3A3564AC.CE7283BF@delanet.com>
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This is a cryptographically signed message in MIME format. --------------ms9D1977CF8358AF37403CD1AE Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit I have a project I am about to undertake and would like some opinions before I begin. We currently have a single server running Qmail on FreeBSD 3.2, with customer Maildirs on a NFS attached external raid connected from another server. This for the most part works fine. We occasionally have problems where the mail server is unable to read the contents of user directories (the NFS server can see them fine). At these times the only fix has been to move the contents of the directory into a temporary location and delete the directory, add it back and move the files back. This happens once every 2 or 3 months. We are now planning to expand our mail system. We would like to keep Qmail and FreeBSD both. We were wishing to have 3 or 4 load balanced front end servers to split the load of the mail servers, with a common fibre channel raid back end. This brings up some obvious issues. First, we wanted to have all 4 hosts processing and able to access the raid simultaneously with ability for live failover and the ability to remove/upgrade individual parts of the cluster at any time. NFS under FreeBSD (as of the posts I saw from Nov 2000) has no support for per client file locking. GFS was my other choice, however Sistina Software said there will not be a copy ported to FreeBSD until Q2/Q3 2001. I do not know of any other file systems that are capable of per client file locking for FreeBSD that will offer reliability and the performance we wish it achieve (If anyone else does, I'd really like to know). This leads to the next question, is file locking necessary under Qmail when using the Maildir style directory structure for the mail store? SMTP will never be accessing any files after it writes them to the Maildir. Pop3 should not interfere either. Perhaps if a user tries to access via pop3 multiple times simultaneously, but otherwise I see no reason for file locking in this environment. If this is the case, what do people think of this cluster configuration with a fibre channel back end raid? Or should we use NFS instead? And if we do use NFS, has the problem we experienced (noted above) been resolved in the more recent releases of FreeBSD or is this a configuration issue on our end? Also, If anyone else has clustered FreeBSD with Qmail already, we would like also to know how you achieved it and any tips you may have as to configuration of such a setup. Any thoughts or suggestions would be appreciated. -- ------------------------------------------------------------ Stephen Comoletti - Network Engineer / Systems Administrator Delanet Inc. http://www.delanet.com Frontline Communications Corp. http://www.fcc.net phone: (302) 326-5800 fax: (302) 326-5802 x312 262 Quigley Blvd, New Castle, DE 19720, USA ------------------------------------------------------------ --------------ms9D1977CF8358AF37403CD1AE Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIHvwYJKoZIhvcNAQcCoIIHsDCCB6wCAQExCzAJBgUrDgMCGgUAMAsGCSqGSIb3DQEHAaCC BbswggKfMIICCKADAgECAgMCvv4wDQYJKoZIhvcNAQEEBQAwgZQxCzAJBgNVBAYTAlpBMRUw EwYDVQQIEwxXZXN0ZXJuIENhcGUxFDASBgNVBAcTC0R1cmJhbnZpbGxlMQ8wDQYDVQQKEwZU aGF3dGUxHTAbBgNVBAsTFENlcnRpZmljYXRlIFNlcnZpY2VzMSgwJgYDVQQDEx9QZXJzb25h bCBGcmVlbWFpbCBSU0EgMTk5OS45LjE2MB4XDTAwMDYxNDE2NDU1NVoXDTAxMDYxNDE2NDU1 NVowQzEfMB0GA1UEAxMWVGhhd3RlIEZyZWVtYWlsIE1lbWJlcjEgMB4GCSqGSIb3DQEJARYR YWRtaW5AZGVsYW5ldC5jb20wgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAN9rJJ0yQZDF hNpzi1vRac6cDHe2oGUX/+mc94Rzzn7auri9ce6UIqFmXuyodGBBpCotAwFqU2fS/5SY3AT4 JFiXsFNvPVSOzCZYRal4GmqAod1nbUXdRQv8XbhaIg4ZrccLwUN0KaYLhweH135McznVSGvV q7kpgdEXkAvlpPGjAgMBAAGjTzBNMBwGA1UdEQQVMBOBEWFkbWluQGRlbGFuZXQuY29tMAwG A1UdEwEB/wQCMAAwHwYDVR0jBBgwFoAUiKvxYINmVfTkWMdGHcBhvSPXw4wwDQYJKoZIhvcN AQEEBQADgYEABJ2xhEJ9tzMP+/AV7uaZMIUntCG47YmpuyUxbyd7xIwAmWLDwoJW6RSBKPfN /9m83n2B61rA7htQcVyAXmmQVh56MAoFg9XD7uNThJW3dItd/4KTvbTwm3SBcPoUcfyjSVx8 yFRoDuXtembYZn7FpNZeugwbjyw/xCmdmKkLaXQwggMUMIICfaADAgECAgELMA0GCSqGSIb3 DQEBBAUAMIHRMQswCQYDVQQGEwJaQTEVMBMGA1UECBMMV2VzdGVybiBDYXBlMRIwEAYDVQQH EwlDYXBlIFRvd24xGjAYBgNVBAoTEVRoYXd0ZSBDb25zdWx0aW5nMSgwJgYDVQQLEx9DZXJ0 aWZpY2F0aW9uIFNlcnZpY2VzIERpdmlzaW9uMSQwIgYDVQQDExtUaGF3dGUgUGVyc29uYWwg RnJlZW1haWwgQ0ExKzApBgkqhkiG9w0BCQEWHHBlcnNvbmFsLWZyZWVtYWlsQHRoYXd0ZS5j b20wHhcNOTkwOTE2MTQwMTQwWhcNMDEwOTE1MTQwMTQwWjCBlDELMAkGA1UEBhMCWkExFTAT BgNVBAgTDFdlc3Rlcm4gQ2FwZTEUMBIGA1UEBxMLRHVyYmFudmlsbGUxDzANBgNVBAoTBlRo YXd0ZTEdMBsGA1UECxMUQ2VydGlmaWNhdGUgU2VydmljZXMxKDAmBgNVBAMTH1BlcnNvbmFs IEZyZWVtYWlsIFJTQSAxOTk5LjkuMTYwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBALNp WpfU0BYLerXFXekhnCNyzRJMS/d+z8f7ynIk9EJSrFeV43theheE5/1yOTiUtOrtZaeSBl69 4GX2GbuUeXZMPrlocHWEHPQRdAC8BSxPCQMXMcz0QdRyxqZd4ohEsIsuxE3x8NaFPmzzlZR4 kX5A6ZzRjRVXjsJz5TDeRvVPAgMBAAGjNzA1MBIGA1UdEwEB/wQIMAYBAf8CAQAwHwYDVR0j BBgwFoAUcknCczTGVfQLdnKBfnf0h+fGsg4wDQYJKoZIhvcNAQEEBQADgYEAa8ZZ6TH66bbs sQPY33Jy/pFgSOrGVd178GeOxmFw523CpTfYnbcXKFYFi91cdW/GkZDGbGZxE9AQfGuRb4bg ITYtwdfqsgmtzy1txoNSm/u7/pyHnfy36XSS5FyXrvx+rMoNb3J6Zyxrc/WG+Z31AG70HQfO nZ6CYynvkwl+Vd4xggHMMIIByAIBATCBnDCBlDELMAkGA1UEBhMCWkExFTATBgNVBAgTDFdl c3Rlcm4gQ2FwZTEUMBIGA1UEBxMLRHVyYmFudmlsbGUxDzANBgNVBAoTBlRoYXd0ZTEdMBsG A1UECxMUQ2VydGlmaWNhdGUgU2VydmljZXMxKDAmBgNVBAMTH1BlcnNvbmFsIEZyZWVtYWls IFJTQSAxOTk5LjkuMTYCAwK+/jAJBgUrDgMCGgUAoIGGMBgGCSqGSIb3DQEJAzELBgkqhkiG 9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTAwMTIxMTIzMzUwOFowIwYJKoZIhvcNAQkEMRYEFKy+ oGqZVOFjCIfqdxgkT6inFOaYMCcGCSqGSIb3DQEJDzEaMBgwBwYFKw4DAgcwDQYIKoZIhvcN AwICASgwDQYJKoZIhvcNAQEBBQAEgYBGibJsFSJzm92eyBrO1eNXJszHmCGvBHJVuAFAI/8u Y0gpFLZk4bEqce+5LTBOOdVluEQHJ+rwpRzwy0f1D4vQGTmjRjRzoiqdIIidS9tmM9WX9tO5 BXb+jtOHGrtEas+H3iXWv3U+A/5ZvVcDljgAZftiyndmHW03JiqqIYrmUQ== --------------ms9D1977CF8358AF37403CD1AE-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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