From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f172.google.com ([209.85.213.172]:34668 "EHLO mail-ig0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751749AbbERL6T (ORCPT ); Mon, 18 May 2015 07:58:19 -0400 Received: by igbhj9 with SMTP id hj9so8691959igb.1 for ; Mon, 18 May 2015 04:58:18 -0700 (PDT) Message-ID: <5559D3D7.4020405@gmail.com> Date: Mon, 18 May 2015 07:58:15 -0400 From: Austin S Hemmelgarn MIME-Version: 1.0 To: Roy Sigurd Karlsbakk , Duncan <1i5t5.duncan@cox.net> CC: linux-btrfs Subject: Re: Btrfs and integration with GNU ++ References: <1761734734.45679.1431891207641.JavaMail.zimbra@karlsbakk.net> <1042503921.46602.1431940928643.JavaMail.zimbra@karlsbakk.net> In-Reply-To: <1042503921.46602.1431940928643.JavaMail.zimbra@karlsbakk.net> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms050803020600090103060004" Sender: linux-btrfs-owner@vger.kernel.org List-ID: This is a cryptographically signed message in MIME format. --------------ms050803020600090103060004 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2015-05-18 05:22, Roy Sigurd Karlsbakk wrote: >>> For btrfs to be accepted as a primary filesystem in major distros, I'= d >>> think it should integrate with existing tools. >> >> Well, fortunately or unfortunately, btrfs is already being accepted as= a >> primary fs in major distros. > > Interesting - which ones is it that's doing this? > While I don't know of any that use it by _default_ yet, I do know that=20 it is an easy to use option on most of the big non-comercial distros=20 already (Debian, Fedora, Ubuntu, etc.), and a couple (Gentoo, Arch, and=20 possibly Slackware) have had the option to use it since it went mainline = (although that is just a side effect of the installation procedures, not = any kind of active attempt at support). >>> Currently, df seems to show good data, while du doesn't. >> >> There has been some work put into what df returns to make it so, while= >> similar work to du has not yet been released, and in fact only quite >> recently (within the last month) has been proposed on the list. >> >> Maturity of the filesystem, again... > > hehe > >>> Lastly - I just did a small test on a 6 drive RAID-6, turned on >>> compression and started cat /proc/zero > testfile - let this run unti= l >>> the filesize was 500GB and stopped it. Made some other test files and= a >>> copy of these with --reflink=3Dauto just for kicks. rm test* and wait= ed. >>> While waiting, did a 'echo b > /proc/sysrq-trigger' and fsck started = on >>> bootup and took a minute or so to complete. Since the filesystem is >>> rather small (6x8GB VDEVs on top of ZFS with SSD caching, kvm as >>> hypervisor), I wonder how long this fsck job would take if it were on= a >>> system with, say, 6 4TB drives. RHEL/CentOS7 just moved to XFS to all= ow >>> for system crashes without this hour-long fsck job, and I somewhat do= ubt >>> that btrfs will be the chosen one if it requires the same amount of t= ime >>> as of ext4. >> >> As Qu mentions, on-mount fsck is not needed on btrfs, as assuming no b= ugs >> (filesystem maturity, again), due to btrfs' COW nature, commits are >> atomic and the filesystem is self-consistent at every commit. Commits= >> occur every 30 seconds by default (it's a mount option), and there's o= nly >> a very limited journal of fsynced transactions kept since the last >> commit, to be sure they are recoverable even when the filesystem crash= es >> between commits, that automatically replays on mount. So no on-mount = fsck >> needed. > > I didn't run it. Some part of the Jessie startup did, and 1 minute for = just 6x8GB (not TB) seems a lot=E2=80=A6 > To me, this sounds like some sort of systemd issue, I have heard of it=20 having issues occasionally with long delays when handling btrfs=20 filesystems with more than 4 devices. --------------ms050803020600090103060004 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIGuDCC BrQwggScoAMCAQICAxBuVTANBgkqhkiG9w0BAQ0FADB5MRAwDgYDVQQKEwdSb290IENBMR4w HAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2lnbmlu ZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZzAeFw0xNTAz MjUxOTM0MzhaFw0xNTA5MjExOTM0MzhaMGMxGDAWBgNVBAMTD0NBY2VydCBXb1QgVXNlcjEj MCEGCSqGSIb3DQEJARYUYWhmZXJyb2luN0BnbWFpbC5jb20xIjAgBgkqhkiG9w0BCQEWE2Fo ZW1tZWxnQG9oaW9ndC5jb20wggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQCdD/zW 2rRAFCLnDfXpWxU1+ODqRVUgzHvrRO7ADUxRo1CBDc3JSX5TIW2OGmQ3DAKGOACp8Z0sgxMc B05tzAZ/M7m4jajVrwwdVCdrwVGxTdAai7Kwg4ZCVfyMVhcwo8R2eW3QahBx34G0RKumK9sZ ZQSQ+zULAzpY6uz7T1sAk/erMoivRXF6u8WvOsLkOD1F/Xyv1ZccSUG5YeDgZgc0nZUBvyIp zXSHjgWerFkrxEM3y2z/Ff3eL1sgGYecV/I1F+I5S01V7Kclt/qRW10c/4JEGRcI1FmrJBPu BtMYPbg/3Y9LZROYN+mVIFxZxOfrmjfFZ96xt/TaMXo8vcEKtWcNEjhGBjEbfMUEm4aq8ygQ 4MuEcpJc8DJCHBkg2KBk13DkbU2qNepTD6Uip1C+g+KMr0nd6KOJqSH27ZuNY4xqV4hIxFHp ex0zY7mq6fV2o6sKBGQzRdI20FDYmNjsLJwjH6qJ8laxFphZnPRpBThmu0AjuBWE72GnI1oA aO+bs92MQGJernt7hByCnDO82W/ykbVz+Ge3Sax8NY0m2Xdvp6WFDY/PjD9CdaJ9nwQGsUSa N54lrZ2qMTeCI9Vauwf6U69BA42xgk65VvxvTNqji+tZ4aZbarZ7el2/QDHOb/rRwlCFplS/ z4l1f1nOrE6bnDl5RBJyW3zi74P6GwIDAQABo4IBWTCCAVUwDAYDVR0TAQH/BAIwADBWBglg hkgBhvhCAQ0ESRZHVG8gZ2V0IHlvdXIgb3duIGNlcnRpZmljYXRlIGZvciBGUkVFIGhlYWQg b3ZlciB0byBodHRwOi8vd3d3LkNBY2VydC5vcmcwDgYDVR0PAQH/BAQDAgOoMEAGA1UdJQQ5 MDcGCCsGAQUFBwMEBggrBgEFBQcDAgYKKwYBBAGCNwoDBAYKKwYBBAGCNwoDAwYJYIZIAYb4 QgQBMDIGCCsGAQUFBwEBBCYwJDAiBggrBgEFBQcwAYYWaHR0cDovL29jc3AuY2FjZXJ0Lm9y ZzAxBgNVHR8EKjAoMCagJKAihiBodHRwOi8vY3JsLmNhY2VydC5vcmcvcmV2b2tlLmNybDA0 BgNVHREELTArgRRhaGZlcnJvaW43QGdtYWlsLmNvbYETYWhlbW1lbGdAb2hpb2d0LmNvbTAN BgkqhkiG9w0BAQ0FAAOCAgEAGvl7xb42JMRH5D/vCIDYvFY3dR2FPd5kmOqpKU/fvQ8ovmJa p5N/FDrsCL+YdslxPY+AAn78PYmL5pFHTdRadT++07DPIMtQyy2qd+XRmz6zP8Il7vGcEDmO WmMLYMq4xV9s/N7t7JJp6ftdIYUcoTVChUgilDaRWMLidtslCdRsBVfUjPb1bF5Ua31diKDP e0M9/e2CU36rbcTtiNCXhptMigzuL3zJXUf2B9jyUV8pnqNEQH36fqJ7YTBLcpq3aYa2XbAH Hgx9GehJBIqwspDmhPCFZ/QmqUXCkt+XfvinQ2NzKR6P3+OdYbwqzVX8BdMeojh7Ig8x/nIx mQ+/ufstL1ZYp0bg13fyK/hPYSIBpayaC76vzWovkIm70DIDRIFLi20p/qTd7rfDYy831Hjm +lDdCECF9bIXEWFk33kA97dgQIMbf5chEmlFg8S0e4iw7LMjvRqMX3eCD8GJ2+oqyZUwzZxy S0Mx+rBld5rrN7LsXwZ671HsGqNeYbYeU25e7t7/Gcc6Bd/kPfA+adEuUGFcvUKH3trDYqNq 6mOkAd8WO/mQadlc3ztS++XDMhmIpfBre9MPAr6usqf+wc+R8Nk9KLK39kEgrqVfzc/fgf8L MaD4rHnusdg4gca6Yi+kNrm99anw7SwaBrBvULYBp7ixNRUhaYiNW4YjTrYxggShMIIEnQIB ATCBgDB5MRAwDgYDVQQKEwdSb290IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5v cmcxIjAgBgNVBAMTGUNBIENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEW EnN1cHBvcnRAY2FjZXJ0Lm9yZwIDEG5VMAkGBSsOAwIaBQCgggH1MBgGCSqGSIb3DQEJAzEL BgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTE1MDUxODExNTgxNVowIwYJKoZIhvcNAQkE MRYEFL7mQ+LX/hRNZ/+8kRvtFcNdhK+XMGwGCSqGSIb3DQEJDzFfMF0wCwYJYIZIAWUDBAEq MAsGCWCGSAFlAwQBAjAKBggqhkiG9w0DBzAOBggqhkiG9w0DAgICAIAwDQYIKoZIhvcNAwIC AUAwBwYFKw4DAgcwDQYIKoZIhvcNAwICASgwgZEGCSsGAQQBgjcQBDGBgzCBgDB5MRAwDgYD VQQKEwdSb290IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMT GUNBIENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2Fj ZXJ0Lm9yZwIDEG5VMIGTBgsqhkiG9w0BCRACCzGBg6CBgDB5MRAwDgYDVQQKEwdSb290IENB MR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2ln bmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZwIDEG5V MA0GCSqGSIb3DQEBAQUABIICAHia9tSb6sd7cB8bT657ydJVPu7IttxqCu1sRKYtD4Q5vTco MJT6OCnf50Y/m9weGxH0ta73C9LuVdCQBjKvK8w5jLcI0RDswA7Ym69Womloy6SWnSUNrb4g 6BYQKz9kTnTrVjg1DRXH6vCt7+u3ZmzESM1VENFDk1SOtzdDT//pHeX6mUX2GDq+ej8nEVRy bOoNUI5UHfId4Lu+gyRdg4G2E1xJB6QljeeCYdSpZitoGbMGVmwDUC7VtHANoxeQMoczlA3y YjEtYOGAJ5C2aCQlNRtxepSkOf1VzYV7XybRpzOs/g2/QfYWGRsPSsmsxE9RtVjCVpWYhIPW MO6nbIca35W7TozbPH1EQvyf+PH5TyYJ9eDBKTjECUEP8KONBmR9annwhEGS2P+TB2+SHER+ vzSov/n1pjIhZh6cE45c5i6Ol3jhl8JpsP9RMGvZQ2nYtKM8Q5sjQLt3PCmDJHBibVl4f1PZ MYj6mR5Zm89P031853IiQ2a+OZj+nuVMPCKIAlHh8h8mYi+gbmnaCeGyIkWdTaLjev3Rjwrc L6zPDcU8HT1b+f3nHi44DlPXo1yHoFBOXIvhoGJB6kBcoD4F75O6wih/kNUpa38fswOSNLpz hphyTcUQ6N5NZpAryqW8bwxx3aMJpg9GMdfrqwO++qIiUIelZC0NgsowO0bWAAAAAAAA --------------ms050803020600090103060004--