Date: Wed, 28 Sep 2016 16:44:46 -0400 From: Jon Radel <jon@radel.com> To: freebsd-questions@freebsd.org Subject: Re: upgrade to 10.3R .... Message-ID: <7adc6f3c-3167-6df9-26e8-a69e22bb49b3@radel.com> In-Reply-To: <44mvirztvd.fsf@be-well.ilk.org> References: <3d09a931-73f8-65d0-588a-70a57c812e85@hiwaay.net> <44mvirztvd.fsf@be-well.ilk.org>
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This is a cryptographically signed message in MIME format. --------------ms090409000605080200070907 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 9/28/16 3:50 PM, Lowell Gilbert wrote: > "William A. Mahaffey III" <wam@hiwaay.net> writes: >=20 >> are many online URLs with dire warnings about using ZFS & non-ECC RAM >> causing data corruption (this box is a commodity desktop w/ non-ECC >=20 >> 1. Are these concerns valid, i.e. founded in fact ? >=20 > Sure. When you get uncorrected bit flips, you can end up corrupting you= r > data or even the filesystem. That isn't unique to ZFS, of course. >=20 > If the data integrity guarantees aren't the deciding reason you're usin= g > ZFS, then this isn't an issue. Some people use ZFS on laptops, for > example, for other features rather than data integrity (most commonly, > compression). I'd argue that it isn't really an issue even if you use ZFS for data integrity. At least not in the way many of the statements on the Internet seem to mean it.... I've read some where you get the sense that the message is: ZFS with non-ECC RAM means you are doomed. Any other file system with non-ECC RAM and everything is hunky-dory. Well, no, not so much. You write garbage in RAM to disk and you're going to have garbage on disk. Choice of file system doesn't help with that. I suspect that there is *some* danger of a higher chance of false positives while scrubbing a ZFS file system using non-ECC RAM actually inducing errors on disk instead of correcting them, and I'd find a credible analysis of that a most interesting read, but really, given the probability of bit error on today's very large hard drives, I'm more worried about the long-term data stability of my disks than of my RAM. That said, for the data I really care about, I use ZFS and ECC RAM.... --=20 --Jon Radel jon@radel.com --------------ms090409000605080200070907 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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