Date: Wed, 3 Aug 2016 10:09:32 -0400 From: Jon Radel <jon@radel.com> To: "Brandon J. Wandersee" <brandon.wandersee@gmail.com> Cc: "William A. Mahaffey III" <wam@hiwaay.net>, FreeBSD Questions !!!! <freebsd-questions@freebsd.org> Subject: Re: Ominous smartd messages .... Message-ID: <7f1afc31-7eda-ba4c-41ea-046a091d6055@radel.com> In-Reply-To: <8637mmdkah.fsf@WorkBox.Home> References: <e5a65f8a-27a0-65e7-42db-28bef824e0c0@hiwaay.net> <117bb75c-aa6a-d562-c971-d0bab742f5ad@radel.com> <8637mmdkah.fsf@WorkBox.Home>
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This is a cryptographically signed message in MIME format. --------------ms070404060603090000010000 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 8/3/16 10:00 AM, Brandon J. Wandersee wrote: >=20 > Jon Radel writes: >=20 >> I've read reasonable sounding commentary from people running very, ver= y >> large collections of hard drives that there is a high enough correlati= on >> between this error and the drive going to heck sooner rather than late= r >> that they take this as a sign to replace. [Can't find reference right= now.] >=20 > While there's no way to know from the error message alone just what wil= l > happen to the disk in the coming days, the general reasoning is this: > sectors are not physically segregated. They all sit on the same > platter. Several bad sectors occuring in a short period might be a sign= > of physical fault in the platter, and if that fault is real then stress= > from the platter spinning will likely cause that fault to spread. So > some people conclude that the appearance of several bad sectors in a > short period should just be a signal to replace the disk immediately. >=20 If I remember the discussion well enough (sad that I can't find it) my use of "correlation" was precise. They actually manage enough drives (thousands) and kept enough records to allow for statistical analysis which indicate that this smartd error correlates very well with failure within [I wish I could remember] timeframe. Do please excuse the utter lack of footnotes. :-( --=20 --Jon Radel jon@radel.com --------------ms070404060603090000010000 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC Cq8wggSvMIIDl6ADAgECAhEA4CPLFRKDU4mtYW56VGdrITANBgkqhkiG9w0BAQsFADBvMQsw CQYDVQQGEwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4 dGVybmFsIFRUUCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290 MB4XDTE0MTIyMjAwMDAwMFoXDTIwMDUzMDEwNDgzOFowgZsxCzAJBgNVBAYTAkdCMRswGQYD VQQIExJHcmVhdGVyIE1hbmNoZXN0ZXIxEDAOBgNVBAcTB1NhbGZvcmQxGjAYBgNVBAoTEUNP TU9ETyBDQSBMaW1pdGVkMUEwPwYDVQQDEzhDT01PRE8gU0hBLTI1NiBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC AQoCggEBAImxDdp6UxlOcFIdvFamBia3uEngludRq/HwWhNJFaO0jBtgvHpRQqd5jKQi3xdh 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