Date: Wed, 23 Apr 2014 10:10:31 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-fs@freebsd.org Subject: Re: ZFS unable to import pool Message-ID: <5357D7E7.605@denninger.net> In-Reply-To: <CAFHbX1Lh7qCsE%2Bgxmf9jBcu5c1Wr_ApHB9SP_VWYnkNj3N_5HQ@mail.gmail.com> References: <B493BD80-CDC2-4BA6-AC14-AE16B373A051@icloud.com> <20140423064203.GD2830@sludge.elizium.za.net> <B1024D84-EBBE-4A9B-82C4-5C19B5A66B60@icloud.com> <20140423080056.GE2830@sludge.elizium.za.net> <20140423091852.GH2830@sludge.elizium.za.net> <20140423100126.GJ2830@sludge.elizium.za.net> <5357937D.4080302@gmail.com> <72E79259-3DB1-48B7-8E5E-19CC2145A464@icloud.com> <888649C4-CC66-48A6-9901-BEA93D1BBFA3@mail.turbofuzz.com> <FC0D5991-8F8D-41D5-BB50-AB840C29F362@icloud.com> <5357CC7B.2090003@denninger.net> <CAFHbX1Lh7qCsE%2Bgxmf9jBcu5c1Wr_ApHB9SP_VWYnkNj3N_5HQ@mail.gmail.com>
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This is a cryptographically signed message in MIME format. --------------ms050304090202020309040908 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable On 4/23/2014 10:03 AM, Tom Evans wrote: > On Wed, Apr 23, 2014 at 3:21 PM, Karl Denninger <karl@denninger.net> wr= ote: >> /*Filesystem based "redundancy" is not a backup strategy!*/ >> > It's my (home) backup strategy :( > > Very few cost efficient ways to backup 15TB+ of data other than > redundant spinning rust. > I have a large home system as well. But I do back it up to other spinning pieces of rust, and rotate the=20 backups out to a bank safe-deposit box. If I make a terrible mistake=20 (or my hardware and/or software does) I have a means of recovery. There = are no guarantees of course in that I COULD wind up with a bad disk in=20 the safe deposit box, but if my house burns down I have a shot at=20 recovery with high odds of success -- an act that would otherwise be=20 impossible. Partitioning my data off into "essentially archival,=20 read-almost-only" and "active" means that the former needs to be updated = rarely and the former is of small enough size that I don't go crazy=20 doing it either in money or time. And I *HAVE* had things like this happen -- twice in the last 20 years=20 I've had a disk adapter go insane and scribble on MULTIPLE spindles at=20 once. There is no RAID strategy that will protect you against this=20 event; you either have a backup or you're done. ZFS actually makes this easier with send/receive and the ability to=20 import a pool, send to it and then export it. The backup pool can have=20 compression turned on where for performance reasons it may not make=20 sense for the online pool to do so. And you can rotate that out fairly=20 easily too; you can take a 2-way mirror, add a third disk and let it=20 resilver, then split the third one off and remove it, giving you a=20 dismounted copy you can then stick in a box and yet if you need it --=20 it's there. --=20 -- Karl karl@denninger.net --------------ms050304090202020309040908 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIFTzCC BUswggQzoAMCAQICAQgwDQYJKoZIhvcNAQEFBQAwgZ0xCzAJBgNVBAYTAlVTMRAwDgYDVQQI EwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoTEEN1ZGEgU3lzdGVtcyBM TEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExLzAtBgkqhkiG9w0BCQEWIGN1c3Rv bWVyLXNlcnZpY2VAY3VkYXN5c3RlbXMubmV0MB4XDTEzMDgyNDE5MDM0NFoXDTE4MDgyMzE5 MDM0NFowWzELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExFzAVBgNVBAMTDkthcmwg RGVubmluZ2VyMSEwHwYJKoZIhvcNAQkBFhJrYXJsQGRlbm5pbmdlci5uZXQwggIiMA0GCSqG SIb3DQEBAQUAA4ICDwAwggIKAoICAQC5n2KBrBmG22nVntVdvgKCB9UcnapNThrW1L+dq6th d9l4mj+qYMUpJ+8I0rTbY1dn21IXQBoBQmy8t1doKwmTdQ59F0FwZEPt/fGbRgBKVt3Quf6W 6n7kRk9MG6gdD7V9vPpFV41e+5MWYtqGWY3ScDP8SyYLjL/Xgr+5KFKkDfuubK8DeNqdLniV jHo/vqmIgO+6NgzPGPgmbutzFQXlxUqjiNAAKzF2+Tkddi+WKABrcc/EqnBb0X8GdqcIamO5 SyVmuM+7Zdns7D9pcV16zMMQ8LfNFQCDvbCuuQKMDg2F22x5ekYXpwjqTyfjcHBkWC8vFNoY 5aFMdyiN/Kkz0/kduP2ekYOgkRqcShfLEcG9SQ4LQZgqjMpTjSOGzBr3tOvVn5LkSJSHW2Z8 Q0dxSkvFG2/lsOWFbwQeeZSaBi5vRZCYCOf5tRd1+E93FyQfpt4vsrXshIAk7IK7f0qXvxP4 GDli5PKIEubD2Bn+gp3vB/DkfKySh5NBHVB+OPCoXRUWBkQxme65wBO02OZZt0k8Iq0i4Rci WV6z+lQHqDKtaVGgMsHn6PoeYhjf5Al5SP+U3imTjF2aCca1iDB5JOccX04MNljvifXgcbJN nkMgrzmm1ZgJ1PLur/ADWPlnz45quOhHg1TfUCLfI/DzgG7Z6u+oy4siQuFr9QT0MQIDAQAB o4HWMIHTMAkGA1UdEwQCMAAwEQYJYIZIAYb4QgEBBAQDAgWgMAsGA1UdDwQEAwIF4DAsBglg hkgBhvhCAQ0EHxYdT3BlblNTTCBHZW5lcmF0ZWQgQ2VydGlmaWNhdGUwHQYDVR0OBBYEFHw4 +LnuALyLA5Cgy7T5ZAX1WzKPMB8GA1UdIwQYMBaAFF3U3hpBZq40HB5VM7B44/gmXiI0MDgG CWCGSAGG+EIBAwQrFilodHRwczovL2N1ZGFzeXN0ZW1zLm5ldDoxMTQ0My9yZXZva2VkLmNy bDANBgkqhkiG9w0BAQUFAAOCAQEAZ0L4tQbBd0hd4wuw/YVqEBDDXJ54q2AoqQAmsOlnoxLO 31ehM/LvrTIP4yK2u1VmXtUumQ4Ao15JFM+xmwqtEGsh70RRrfVBAGd7KOZ3GB39FP2TgN/c L5fJKVxOqvEnW6cL9QtvUlcM3hXg8kDv60OB+LIcSE/P3/s+0tEpWPjxm3LHVE7JmPbZIcJ1 YMoZvHh0NSjY5D0HZlwtbDO7pDz9sZf1QEOgjH828fhtborkaHaUI46pmrMjiBnY6ujXMcWD pxtikki0zY22nrxfTs5xDWGxyrc/cmucjxClJF6+OYVUSaZhiiHfa9Pr+41okLgsRB0AmNwE f6ItY3TI8DGCBQowggUGAgEBMIGjMIGdMQswCQYDVQQGEwJVUzEQMA4GA1UECBMHRmxvcmlk YTESMBAGA1UEBxMJTmljZXZpbGxlMRkwFwYDVQQKExBDdWRhIFN5c3RlbXMgTExDMRwwGgYD VQQDExNDdWRhIFN5c3RlbXMgTExDIENBMS8wLQYJKoZIhvcNAQkBFiBjdXN0b21lci1zZXJ2 aWNlQGN1ZGFzeXN0ZW1zLm5ldAIBCDAJBgUrDgMCGgUAoIICOzAYBgkqhkiG9w0BCQMxCwYJ KoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNDA0MjMxNTEwMzFaMCMGCSqGSIb3DQEJBDEW BBSN9woTDov4UIO++zrgru03seKnQjBsBgkqhkiG9w0BCQ8xXzBdMAsGCWCGSAFlAwQBKjAL BglghkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFA MAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMIG0BgkrBgEEAYI3EAQxgaYwgaMwgZ0xCzAJBgNV BAYTAlVTMRAwDgYDVQQIEwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoT EEN1ZGEgU3lzdGVtcyBMTEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExLzAtBgkq hkiG9w0BCQEWIGN1c3RvbWVyLXNlcnZpY2VAY3VkYXN5c3RlbXMubmV0AgEIMIG2BgsqhkiG 9w0BCRACCzGBpqCBozCBnTELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExEjAQBgNV BAcTCU5pY2V2aWxsZTEZMBcGA1UEChMQQ3VkYSBTeXN0ZW1zIExMQzEcMBoGA1UEAxMTQ3Vk YSBTeXN0ZW1zIExMQyBDQTEvMC0GCSqGSIb3DQEJARYgY3VzdG9tZXItc2VydmljZUBjdWRh c3lzdGVtcy5uZXQCAQgwDQYJKoZIhvcNAQEBBQAEggIAWWHcYxbxVf76zlMh4f+ETfHO3D7m ciefXwlw0I1tA9mCFo2vVrdRKxd9V7AOv6yy5mGsPJxWqMns5gpmIGwHewdFEWHcLsoDrNfV APagqG9mEUEdmVEXpTA9WXGYaES8t2ODUoPt07w1WwOU96CKmruwTvCnLhwiGe3KvfppqVWM ZYcUs/kX2Rr/5i4+gOBo8q2q1t+6QWtOy2zRHQVAH/rNgZKpefly3wK/tA6A3hmkfXiK8c1C R5Dy3Idxl8D38UZpO3Ow7GzcScu3UyXTCqblvGLq8zYzgT4GGvItMqyxseYJ7rkowRowuTcy 6EVha+j6Wcj+3Qt3UgH3WSiZhoUoj1sfsKayYMoCXrGy3PLTFHq9atfG55j5E284Y2T3JYUq UMS/XPPytwiQt16ZgScHqYISiOHR2mppUyTttLpQT8rkvE/WfGnVNNW4luz1Wd6UKop9hee5 rPfrlT6arUe/XQcdy48uoxl5R+AoZWnkD/qGH1WBmNmwsIIa/qnnEtBbBxdSogaEsDa3dNQh aXgapO4E7wWU2cboxjs01LlKdW0dQAW6aKesofrCdyWzel/V0wyrFG9MFmOk5xmxa4WVzWo9 ubfuYBMutXYzkbpjqOcD0TeCgIZeACxBPEUP2uC76jrcTmlFSEgJkA9nLOPysoPDFRC1PCyE Qx7ktKAAAAAAAAA= --------------ms050304090202020309040908--
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