Date: Sun, 23 Mar 2014 12:50:16 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: ZFS cautions (pool flag additions committed) Message-ID: <532F1ED8.8010004@denninger.net>
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This is a cryptographically signed message in MIME format. --------------ms080807090508010200070500 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable When ZFS code imports are brought forward that add feature flags there=20 is a potential time bomb for existing users in that creation of a new=20 pool becomes non-revertible (except read-only!) with regard to mounting=20 on older revisions of the code. The same thing happens if you do a "zpool upgrade" of course, but at=20 least that's an explicit act. You might not realize that you're at risk = on a pool create, however, unless you **carefully** scrutinize the flags = that were on the last version compared against the current one. The primary "gotcha" here occurs if you don't upgrade your emergency=20 boot media and for some reason you need to boot from a CD or USB key --=20 you can be left SEVERELY screwed, and since -RELEASE is typically not=20 rebuilt when this happens if you don't have a second machine laying=20 around on which you can build a RELEASE image.... I've caught this twice now since 10.0-RELEASE shipped and, while I=20 haven't been bit by it, it serves as a caution because eventually=20 someone tracking -STABLE is going to get badly hurt and be left with an=20 unrepairable system. IMHO there should be some sort of notice on the=20 list when new zpool feature flags show up so you're fairly warned that=20 building a new emergency boot media copy is required if you intend to=20 track -STABLE on a continuing basis. --=20 -- Karl karl@denninger.net --------------ms080807090508010200070500 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 KoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0xNDAzMjMxNzUwMTZaMCMGCSqGSIb3DQEJBDEW BBRAQXUGr7nn6Jyiz1uymP69jG3lvTBsBgkqhkiG9w0BCQ8xXzBdMAsGCWCGSAFlAwQBKjAL BglghkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFA MAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMIG0BgkrBgEEAYI3EAQxgaYwgaMwgZ0xCzAJBgNV BAYTAlVTMRAwDgYDVQQIEwdGbG9yaWRhMRIwEAYDVQQHEwlOaWNldmlsbGUxGTAXBgNVBAoT EEN1ZGEgU3lzdGVtcyBMTEMxHDAaBgNVBAMTE0N1ZGEgU3lzdGVtcyBMTEMgQ0ExLzAtBgkq hkiG9w0BCQEWIGN1c3RvbWVyLXNlcnZpY2VAY3VkYXN5c3RlbXMubmV0AgEIMIG2BgsqhkiG 9w0BCRACCzGBpqCBozCBnTELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExEjAQBgNV BAcTCU5pY2V2aWxsZTEZMBcGA1UEChMQQ3VkYSBTeXN0ZW1zIExMQzEcMBoGA1UEAxMTQ3Vk YSBTeXN0ZW1zIExMQyBDQTEvMC0GCSqGSIb3DQEJARYgY3VzdG9tZXItc2VydmljZUBjdWRh c3lzdGVtcy5uZXQCAQgwDQYJKoZIhvcNAQEBBQAEggIAIFk9AOEE9VF4Y1AWD/Ny183QYen7 OAkpf4Pl8vHS66ohtIsApxLNliE1NpWODX70EHvc7S8glP3NjzCcA+M9aNNlgyobTlus9EA5 9ZZRWoOTEHc0w5yM7yQPg5ZUHYIJGh0liKVo7pRGL80wiCaoasgNtKkJaKumvY+VxZKKqiTu +ESXdHE1qxjfAcwjeSb2GLAPo5YwkYQ/sAlXYc6el7KLqjK2Eqik92AeOlK9l8wXQIzMmA7k 25f89/vO5uY7ZCrJo9yM1DqnvYUHgExotwbnIKe9bUSQtqIMi0d+zDiuQ9qkmeQiUx6RBZnw LLfF81jcXYL5IfxU87um1gMYdJ1jGsh2xVbDdVHjwDw90gpEndRNubx+sWBjyeBBaRKfmdDj +ijvgrgqqa0Kvo/fJJ35uheJbNikIxKz5IC+xKsVMVUPDOxLtPwHZm7ErxQfcWzXLMBFzVFv CwjYhOi0E4UyJXunwfsDVxe0zHksMK0AtyxRuJk5rK59Ksl5ZnskN7UJ5fWljV4Ew8+hqfbN 8KVaxL55A5MZmqWJ9LPdQk+l84V1fDxuvttK5v/Hzj7PiztQqf9E76yHXWnDpMXpE8RjHsJD jT4G5j2+hv4RerJktIBWhKo92OjippyGycr3bac/U3sGfXZQpP/vrVFq3BcO5C4YKZv/E3Qy ESEW5pMAAAAAAAA= --------------ms080807090508010200070500--
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