Date: Fri, 08 Jul 2005 15:49:39 -0700 From: Yu-Shun Wang <yushunwa@ISI.EDU> To: Mohan Srinivasan <mohan_srinivasan@yahoo.com> Cc: freebsd-current@freebsd.org, Oliver Lehmann <lehmann@ans-netz.de>, Claus Guttesen <kometen@gmail.com> Subject: Re: problems with soft-nfs when the server goes down Message-ID: <42CF0303.3090004@isi.edu> In-Reply-To: <20050708213919.15818.qmail@web80604.mail.yahoo.com> References: <20050708213919.15818.qmail@web80604.mail.yahoo.com>
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This is a cryptographically signed message in MIME format. --------------ms080503090002030404030804 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Mohan Srinivasan wrote: > --- Claus Guttesen <kometen@gmail.com> wrote: >>>Now my NFS-nt is running 6-CURRENT and my NFS-server still runs 5.4 >>>When the server gets unavailable, the proccesses on the client will lock >>>- OK so far. >>>The problematic thing is, after the server is back online, I still see no >>>way to get the locked processes back to continue. They are still in heir >>>NFS-lock. All I can do is reboot the system. That only happens when I >>>mount the nfs filesystem with "soft". >> >>Do you tcp- or udp-mount? AFAIK tcp-mount's don't work properly in 6.0 >>(current). > NFS/TCP mounts should work in -current. There was a bug reported > against NFS/TCP (retransmits were not happening reliably when the > server went down). That was fixed several weeks ago. > > If you see something broken with NFS/TCP, please let me know. Hi, I am not sure that's the case. We might be talking about differnt bugs FWIW. I also had NFS-related lockups as recent as CURRENT on 6/27/2005, probably on 7/5/2005 as well. You could search for 'nfs' on the list for the last two months. As far as I could remember, the problem has to do with nfs pkts or mbuf mis-alignment, and the realign functions in either the client or the server couldn't deal with serious mis-alignment. I could be wrong, check the archive for more details. Just a data point of my setup: nfs client running CURRENT, server is solaris, was using NFS/TCP with NFSv3. Simple TCPDUMP showed that the client kept sending access request and the server kept answering it, but the client never accepted (for the lack of better terms) those replies. So in my case, the server was never down (at least during those lockups). I have no hard evidence on how to re-produce the lockups, some mentioned after or duing heavy IO traffic. But it's definitely there. It annoyed me enough that I took the easy way out: switched to NFS/UDP since yesterday. :-) Thanks, yushun -- Yu-Shun Wang <yushunwa@isi.edu> http://www.isi.edu/~yushunwa USC Information Sciences Institute --------------ms080503090002030404030804 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 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJeTCC AxcwggKAoAMCAQICAw4K/TANBgkqhkiG9w0BAQQFADBiMQswCQYDVQQGEwJaQTElMCMGA1UE ChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNv bmFsIEZyZWVtYWlsIElzc3VpbmcgQ0EwHhcNMDUwMjE1MjIyMDQ0WhcNMDYwMjE1MjIyMDQ0 WjB6MQ0wCwYDVQQEEwRXYW5nMRAwDgYDVQQqEwdZdS1TaHVuMRUwEwYDVQQDEwxZdS1TaHVu IFdhbmcxHzAdBgkqhkiG9w0BCQEWEHl1c2h1bndhQGlzaS5lZHUxHzAdBgkqhkiG9w0BCQEW EHl1c2h1bndhQHVzYy5lZHUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCpbzTn ssgn3J00Mbb7NiBsaUnnnXeJKrXZM5bDChNw3BZcmZKQwKQA1EZqc10z0AOhg6azfLhKJK2Y 6JKoTOHDdLmgWbHy9L5EGUi2+hWh39nXPqlnk+MMWH+nmWBW2mr5E5n+vHrCS7kp6mr2QGuU D3yolypb0TKrUFWo8RUz2N+0GRz3MXquyLLm2twIn4pAgxbI8gnkba9LLWfA+fKkpyAx2421 dOlKsAmlA6gL1NmXw0bC8o3tNvxxlvJK9Y3G61/wpo4bbHRtVUDbk3evv+NHwNOHb8MZzIEY 6m1KAnGJzCz406bbDCxkRuKJkX5a0Srx8gyQNfmpmbLShHJtAgMBAAGjPzA9MC0GA1UdEQQm MCSBEHl1c2h1bndhQGlzaS5lZHWBEHl1c2h1bndhQHVzYy5lZHUwDAYDVR0TAQH/BAIwADAN BgkqhkiG9w0BAQQFAAOBgQCe4GN9Ke0+xslYMGSeJWrLNujx4ecZ48emfbWgnEfdAP77HKQC 7vomxYXs2NfhoDt/cgado9v7sgRqPen/lUYCwneXM0O9dcsWqfCGBH3iEcDQsr1eX+PhQbxR nPRYY+m+rU4n9bma6bdovN4CA1VAg7cI8lrp4sDuRU8frC7bDjCCAxcwggKAoAMCAQICAw4K /TANBgkqhkiG9w0BAQQFADBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1 bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElz c3VpbmcgQ0EwHhcNMDUwMjE1MjIyMDQ0WhcNMDYwMjE1MjIyMDQ0WjB6MQ0wCwYDVQQEEwRX YW5nMRAwDgYDVQQqEwdZdS1TaHVuMRUwEwYDVQQDEwxZdS1TaHVuIFdhbmcxHzAdBgkqhkiG 9w0BCQEWEHl1c2h1bndhQGlzaS5lZHUxHzAdBgkqhkiG9w0BCQEWEHl1c2h1bndhQHVzYy5l ZHUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCpbzTnssgn3J00Mbb7NiBsaUnn nXeJKrXZM5bDChNw3BZcmZKQwKQA1EZqc10z0AOhg6azfLhKJK2Y6JKoTOHDdLmgWbHy9L5E GUi2+hWh39nXPqlnk+MMWH+nmWBW2mr5E5n+vHrCS7kp6mr2QGuUD3yolypb0TKrUFWo8RUz 2N+0GRz3MXquyLLm2twIn4pAgxbI8gnkba9LLWfA+fKkpyAx2421dOlKsAmlA6gL1NmXw0bC 8o3tNvxxlvJK9Y3G61/wpo4bbHRtVUDbk3evv+NHwNOHb8MZzIEY6m1KAnGJzCz406bbDCxk RuKJkX5a0Srx8gyQNfmpmbLShHJtAgMBAAGjPzA9MC0GA1UdEQQmMCSBEHl1c2h1bndhQGlz aS5lZHWBEHl1c2h1bndhQHVzYy5lZHUwDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQQFAAOB gQCe4GN9Ke0+xslYMGSeJWrLNujx4ecZ48emfbWgnEfdAP77HKQC7vomxYXs2NfhoDt/cgad o9v7sgRqPen/lUYCwneXM0O9dcsWqfCGBH3iEcDQsr1eX+PhQbxRnPRYY+m+rU4n9bma6bdo vN4CA1VAg7cI8lrp4sDuRU8frC7bDjCCAz8wggKooAMCAQICAQ0wDQYJKoZIhvcNAQEFBQAw gdExCzAJBgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUg VG93bjEaMBgGA1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRp b24gU2VydmljZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFp bCBDQTErMCkGCSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0w MzA3MTcwMDAwMDBaFw0xMzA3MTYyMzU5NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxU aGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwg RnJlZW1haWwgSXNzdWluZyBDQTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV +065yplaHmjAdQRwnd/p/6Me7L3N9VvyGna9fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfAr hVqqP3FWy688Cwfn8R+RNiQqE88r1fOCdz0Dviv+uxg+B79AgAJk16emu59l0cUqVIUPSAR/ p7bRPGEEQB5kGXJgt/sCAwEAAaOBlDCBkTASBgNVHRMBAf8ECDAGAQH/AgEAMEMGA1UdHwQ8 MDowOKA2oDSGMmh0dHA6Ly9jcmwudGhhd3RlLmNvbS9UaGF3dGVQZXJzb25hbEZyZWVtYWls Q0EuY3JsMAsGA1UdDwQEAwIBBjApBgNVHREEIjAgpB4wHDEaMBgGA1UEAxMRUHJpdmF0ZUxh YmVsMi0xMzgwDQYJKoZIhvcNAQEFBQADgYEASIzRUIPqCy7MDaNmrGcPf6+svsIXoUOWlJ1/ TCG4+DYfqi2fNi/A9BxQIJNwPP2t4WFiw9k6GX6EsZkbAMUaC4J0niVQlGLH2ydxVyWN3amc OY6MIE9lX5Xa9/eH1sYITq726jTlEBpbNU1341YheILcIRk13iSx0x1G/11fZU8xggM7MIID NwIBATBpMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5 KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQID Dgr9MAkGBSsOAwIaBQCgggGnMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcN AQkFMQ8XDTA1MDcwODIyNDkzOVowIwYJKoZIhvcNAQkEMRYEFPJ8vzbuDovkvZjSdPjceLpo 0XYIMFIGCSqGSIb3DQEJDzFFMEMwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqG SIb3DQMCAgFAMAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMHgGCSsGAQQBgjcQBDFrMGkwYjEL MAkGA1UEBhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAq BgNVBAMTI1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBAgMOCv0wegYLKoZI hvcNAQkQAgsxa6BpMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGlu ZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWlu ZyBDQQIDDgr9MA0GCSqGSIb3DQEBAQUABIIBABiL7oALtSBrKp6Oa946IgbSkokPkGSTYgkB tdRMpjvwaOPguFFep+hXfm/idaRc6RpKXAJHdKM5n7lU1fi96h2hK7egWxYHnQ3P3DZ6QUQJ dBxO0nNS/XzGJE3FDvN+iixp+ItZDi9fStBzjMSuM++vKvX9diXNCcHP3EtFjMn7Fdo1hSjs 4/qVEXX4QrRXHsqLXqun+CtXZ3JWJGpu8VNRpjGp+q3Cl9kViZbSdZCSyTbAPsJ2eSY7SS+R j+hJRMvgKwEytTTMOQrqlfFmb2y/eLuugy67kUaT4zSEubdo+ysHxMUitx8B1PM653+m/wtW faHhnEqq/+JtXLmpDw0AAAAAAAA= --------------ms080503090002030404030804--
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