From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753912AbbIROkN (ORCPT ); Fri, 18 Sep 2015 10:40:13 -0400 Received: from mail-io0-f171.google.com ([209.85.223.171]:33095 "EHLO mail-io0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751853AbbIROkL (ORCPT ); Fri, 18 Sep 2015 10:40:11 -0400 Subject: Re: Failover root devices To: Richard Weinberger , Richard Weinberger , Drew DeVault References: <55FAA6BB.3060008@odi.ch> <20150917114955.GA2600@homura> <55FB087C.1050105@gmail.com> <55FB0923.30505@nod.at> Cc: =?UTF-8?Q?Ortwin_Gl=c3=bcck?= , "linux-kernel@vger.kernel.org" From: Austin S Hemmelgarn Message-ID: <55FC2240.8000309@gmail.com> Date: Fri, 18 Sep 2015 10:40:00 -0400 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <55FB0923.30505@nod.at> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms050400080504050400020606" X-Antivirus: avast! (VPS 150918-0, 2015-09-18), Outbound message X-Antivirus-Status: Clean Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms050400080504050400020606 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-09-17 14:40, Richard Weinberger wrote: > Am 17.09.2015 um 20:37 schrieb Austin S Hemmelgarn: >> On 2015-09-17 13:47, Richard Weinberger wrote: >>> On Thu, Sep 17, 2015 at 1:49 PM, Drew DeVault wrote: >>>> On 2015-09-17 1:40 PM, Ortwin Gl=C3=BCck wrote: >>>>> You can do that completely in user space from an initramfs. >>>> >>>> Yep, I'm aware of that. I think it would still be useful for the ker= nel >>>> to support it. Bonus - if the kernel supports it, there's a standard= way >>>> of doing it that would propegate down to the various initramfs desig= ns >>>> of the distros without having me write patches against all of them. >>>> Right? >>> >>> I really don't see why we need this feature in-kernel as it can be >>> done perfectly fine >>> in userspace. Every non-trivial system needs an initramfs anyway thes= e days. >>> >> Ha, not unless you're using systemd. I have more than 2 dozen servers= with complex setups that boot just fine without an initramfs. Yes there= is more setup done in initramfs >> these days, but it's still not actually needed in most cases except co= mplicated storage setups. > > I really don't count root=3DUUID... or root=3DLABEL... as complicated s= torage setup... > > Thanks, > //richard > That's not what I mean, I mean stuff like /usr and /var on separate=20 filesystems, in a couple of cases self-assembling MD arrays, and in a=20 couple of cases ATAoE or iSCSI backed root filesystems on hardware that=20 doesn't natively support booting such devices. --------------ms050400080504050400020606 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC Brgwgga0MIIEnKADAgECAgMQblUwDQYJKoZIhvcNAQENBQAweTEQMA4GA1UEChMHUm9vdCBD QTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNp Z25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2VydC5vcmcwHhcN MTUwMzI1MTkzNDM4WhcNMTUwOTIxMTkzNDM4WjBjMRgwFgYDVQQDEw9DQWNlcnQgV29UIFVz ZXIxIzAhBgkqhkiG9w0BCQEWFGFoZmVycm9pbjdAZ21haWwuY29tMSIwIAYJKoZIhvcNAQkB FhNhaGVtbWVsZ0BvaGlvZ3QuY29tMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA nQ/81tq0QBQi5w316VsVNfjg6kVVIMx760TuwA1MUaNQgQ3NyUl+UyFtjhpkNwwChjgAqfGd LIMTHAdObcwGfzO5uI2o1a8MHVQna8FRsU3QGouysIOGQlX8jFYXMKPEdnlt0GoQcd+BtESr pivbGWUEkPs1CwM6WOrs+09bAJP3qzKIr0VxervFrzrC5Dg9Rf18r9WXHElBuWHg4GYHNJ2V Ab8iKc10h44FnqxZK8RDN8ts/xX93i9bIBmHnFfyNRfiOUtNVeynJbf6kVtdHP+CRBkXCNRZ qyQT7gbTGD24P92PS2UTmDfplSBcWcTn65o3xWfesbf02jF6PL3BCrVnDRI4RgYxG3zFBJuG qvMoEODLhHKSXPAyQhwZINigZNdw5G1NqjXqUw+lIqdQvoPijK9J3eijiakh9u2bjWOMaleI SMRR6XsdM2O5qun1dqOrCgRkM0XSNtBQ2JjY7CycIx+qifJWsRaYWZz0aQU4ZrtAI7gVhO9h pyNaAGjvm7PdjEBiXq57e4QcgpwzvNlv8pG1c/hnt0msfDWNJtl3b6elhQ2Pz4w/QnWifZ8E BrFEmjeeJa2dqjE3giPVWrsH+lOvQQONsYJOuVb8b0zao4vrWeGmW2q2e3pdv0Axzm/60cJQ haZUv8+JdX9ZzqxOm5w5eUQSclt84u+D+hsCAwEAAaOCAVkwggFVMAwGA1UdEwEB/wQCMAAw VgYJYIZIAYb4QgENBEkWR1RvIGdldCB5b3VyIG93biBjZXJ0aWZpY2F0ZSBmb3IgRlJFRSBo ZWFkIG92ZXIgdG8gaHR0cDovL3d3dy5DQWNlcnQub3JnMA4GA1UdDwEB/wQEAwIDqDBABgNV HSUEOTA3BggrBgEFBQcDBAYIKwYBBQUHAwIGCisGAQQBgjcKAwQGCisGAQQBgjcKAwMGCWCG SAGG+EIEATAyBggrBgEFBQcBAQQmMCQwIgYIKwYBBQUHMAGGFmh0dHA6Ly9vY3NwLmNhY2Vy dC5vcmcwMQYDVR0fBCowKDAmoCSgIoYgaHR0cDovL2NybC5jYWNlcnQub3JnL3Jldm9rZS5j cmwwNAYDVR0RBC0wK4EUYWhmZXJyb2luN0BnbWFpbC5jb22BE2FoZW1tZWxnQG9oaW9ndC5j b20wDQYJKoZIhvcNAQENBQADggIBABr5e8W+NiTER+Q/7wiA2LxWN3UdhT3eZJjqqSlP370P KL5iWqeTfxQ67Ai/mHbJcT2PgAJ+/D2Ji+aRR03UWnU/vtOwzyDLUMstqnfl0Zs+sz/CJe7x nBA5jlpjC2DKuMVfbPze7eySaen7XSGFHKE1QoVIIpQ2kVjC4nbbJQnUbAVX1Iz29WxeVGt9 XYigz3tDPf3tglN+q23E7YjQl4abTIoM7i98yV1H9gfY8lFfKZ6jREB9+n6ie2EwS3Kat2mG tl2wBx4MfRnoSQSKsLKQ5oTwhWf0JqlFwpLfl374p0Njcykej9/jnWG8Ks1V/AXTHqI4eyIP Mf5yMZkPv7n7LS9WWKdG4Nd38iv4T2EiAaWsmgu+r81qL5CJu9AyA0SBS4ttKf6k3e63w2Mv N9R45vpQ3QhAhfWyFxFhZN95APe3YECDG3+XIRJpRYPEtHuIsOyzI70ajF93gg/BidvqKsmV MM2ccktDMfqwZXea6zey7F8Geu9R7BqjXmG2HlNuXu7e/xnHOgXf5D3wPmnRLlBhXL1Ch97a w2KjaupjpAHfFjv5kGnZXN87UvvlwzIZiKXwa3vTDwK+rrKn/sHPkfDZPSiyt/ZBIK6lX83P 34H/CzGg+Kx57rHYOIHGumIvpDa5vfWp8O0sGgawb1C2Aae4sTUVIWmIjVuGI062MYIE0TCC BM0CAQEwgYAweTEQMA4GA1UEChMHUm9vdCBDQTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNl cnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcN AQkBFhJzdXBwb3J0QGNhY2VydC5vcmcCAxBuVTANBglghkgBZQMEAgMFAKCCAiEwGAYJKoZI hvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMTUwOTE4MTQ0MDAwWjBPBgkq hkiG9w0BCQQxQgRAtj8OCcs4atTAwL5VywVV/kcgWdqvhzV5mGN96xjspEtQOSJ9r/d7Jx5Q Gqegbqsh7VnU4gIIcqsa2UCBvZK6nDBsBgkqhkiG9w0BCQ8xXzBdMAsGCWCGSAFlAwQBKjAL BglghkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFA MAcGBSsOAwIHMA0GCCqGSIb3DQMCAgEoMIGRBgkrBgEEAYI3EAQxgYMwgYAweTEQMA4GA1UE ChMHUm9vdCBDQTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlD QSBDZXJ0IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy dC5vcmcCAxBuVTCBkwYLKoZIhvcNAQkQAgsxgYOggYAweTEQMA4GA1UEChMHUm9vdCBDQTEe MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNpZ25p bmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2VydC5vcmcCAxBuVTAN BgkqhkiG9w0BAQEFAASCAgAYH3pIA/k5db/W3UAGMlzDfnP66U+DtesyPIcw8HaxJQpKhguG aVZLjgDYJ9Y+Ma4X9+ArCXAZTruTog/PyhBpdWq5F7QW+UZQm2kKu0o53U/BaRXLqqi1HVP7 3/Y55OcbMkD5sfTwohstqePHWRwAZuWeqpXEM/bz85qcwZPcy7CX5nbqDxqvWyclpK0XQgek pJpQFiaMkX71gEO3Je55+C5Xd/utTT9ALDe0bHJ12cvpYggWewTkPiInJ0/SxBuChP3gvDOf qKI5IXXT97krAvQPOsCDOadYewzhNJiAMCir5nHtmInhMBV17UQaT7nWWW2cLezSeiE83j5D LPOG5WXulEtnq9GKr7qWf1X/8GaeJXpBacFG7QQdtHvHye1kdQEhQybqMceHS4XS4kgxd8yw u5/sxJeRjVazxH36t+tKfU/k6kifWV3weU84oWgs+iYOMiTVECe+8EjCn55dD8aCDiKYR/Co zWd4DrYjVXW5OX/UEe4WkLGiAmjzE6rhJAEUef7+6IEc/it/6vtMjoAXrf4y4eMEEHndj7U7 p0PEGAjtf0iS72vdxfu/Cu07IPq1JelG+NykgMTqJJ5GiIf3E+3k2MR/deao5sagKxTAxrU+ 1AQcHstAInBFrW42Dl1aR7TSDs8g1qnHnpkivLB67E5/w71e8LYFKnS2vQAAAAAAAA== --------------ms050400080504050400020606--