Date: Wed, 3 Aug 2016 00:18:49 -0400 From: Jon Radel <jon@radel.com> To: "William A. Mahaffey III" <wam@hiwaay.net>, FreeBSD Questions !!!! <freebsd-questions@freebsd.org> Subject: Re: Ominous smartd messages .... Message-ID: <117bb75c-aa6a-d562-c971-d0bab742f5ad@radel.com> In-Reply-To: <e5a65f8a-27a0-65e7-42db-28bef824e0c0@hiwaay.net> References: <e5a65f8a-27a0-65e7-42db-28bef824e0c0@hiwaay.net>
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This is a cryptographically signed message in MIME format. --------------ms050009000700050806030602 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 8/2/16 11:41 PM, William A. Mahaffey III wrote: > It has 8 1 TB HDD's in a ZFS unmirrored pool.=20 Do I understand this to mean you have 8 TB with no redundancy? Pretty brutal if your data starts rotting away. :-( > Aug 1 23:09:59 devbox smartd[835]: Device: /dev/ada5, 8 Currently > unreadable (pending) sectors >=20 > My question is: Are these messages benign, or am I in the market for > more hardware ? *ANY* more questions, please ask. TIA & have a good one= =2E >=20 Somewhere between, YMMV, depends on your luck and the phase of the moon. That's useless, so I'll expand: I've read reasonable sounding commentary from people running very, very large collections of hard drives that there is a high enough correlation between this error and the drive going to heck sooner rather than later that they take this as a sign to replace. [Can't find reference right no= w.] I've read reasonable sounding commentary that by writing to the bad sector(s) you can force the HD to reallocate the sectors (assuming remaining capacity to do that) and then use ZFS redundancy and a good scrub to recover the data you trashed with dd (might not apply to you). Then there's a good chance that all will be well indefinitely. See https://dekoder.wordpress.com/2014/10/08/fixing-freenas-currently-unreada= ble-pending-sectors-error/ for an example of this school of thought. Actually, given that the messages stopped again, I suspect reallocation already happened, but a smartd test should tell you for certain. (You didn't have a scrub running between 8/2 03:39 and 04:09 by any chance?) Personally, so long as only one drive in my pool is doing this I tend to replace but not rush. I'd rush more if the sector count started creeping up, up, up. --=20 --Jon Radel jon@radel.com --------------ms050009000700050806030602 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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