Date: Wed, 23 Jan 2013 22:22:48 +0100 From: Michel Talon <talon@lpthe.jussieu.fr> To: Mark Felder <feld@feld.me> Cc: freebsd-hackers@freebsd.org Subject: Re: ZFS regimen: scrub, scrub, scrub and scrub again. Message-ID: <101D6382-BF57-43EB-A5FA-A63D4062F5FD@lpthe.jussieu.fr>
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--Apple-Mail=_60D7FFA2-FBE5-4978-BAFE-C56FF486A309 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii On Wed, 23 Jan 2013 14:26:43 -0600, Chris Rees <utisoft@gmail.com> wrote: > > So we have to take your word for it? > Provide a link if you're going to make assertions, or they're no more > than > your own opinion. I've heard this same thing -- every vdev == 1 drive in performance. I've never seen any proof/papers on it though. first google answer from request "raids performance" https://blogs.oracle.com/roch/entry/when_to_and_not_to Effectively, as a first approximation, an N-disk RAID-Z group will behave as a single device in terms of delivered random input IOPS. Thus a 10-disk group of devices each capable of 200-IOPS, will globally act as a 200-IOPS capable RAID-Z group. This is the price to pay to achieve proper data protection without the 2X block overhead associated with mirroring. -- Michel Talon talon@lpthe.jussieu.fr --Apple-Mail=_60D7FFA2-FBE5-4978-BAFE-C56FF486A309 Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIIbzCCA7Yw ggKeoAMCAQICAQMwDQYJKoZIhvcNAQEFBQAwLDELMAkGA1UEBhMCRlIxDTALBgNVBAoTBENOUlMx DjAMBgNVBAMTBUNOUlMyMB4XDTA5MDEyMTA5MDM1MloXDTI5MDEyMDA5MDM1MlowNTELMAkGA1UE BhMCRlIxDTALBgNVBAoTBENOUlMxFzAVBgNVBAMTDkNOUlMyLVN0YW5kYXJkMIIBIjANBgkqhkiG 9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnKlkarQHIxnDvggIxOIqXe3UKN7+P6DtkkRrFkc1EzeNdKn1 TYPkBRuPCGFM3ndb16n/u2Wdyaw8D/GJe5MioEcPXwa+jnigC3nXQmVhcmOSQIpbZxD61ic+2HdN Hnnbb0sSAFJY4thCBbIzN3fgjWwdvPj28pRYJfeC2YbZXPPYLs39cIkEh+850SrYkoxpLxxSZfpg jxB/zI/5XC4U7UyL4J03uNI8lMpQ/UF63vY87K7svVwW3bDwc5l6gf87M9IAnk2Mxls4LjPDdobK clTbLeIQ/ZJQaJOE7XepiWlRhevglKP5lwgRjCTwD7o4tCzW12xOY/60MZ/vj6ZapQIDAQABo4HZ MIHWMA8GA1UdEwEB/wQFMAMBAf8wHQYDVR0OBBYEFBHj2dFSRxtZsTwbeGZr9KGI7QpbMFQGA1Ud IwRNMEuAFFCXtg33rDMXr/EdRjxrO/8AoOXloTCkLjAsMQswCQYDVQQGEwJGUjENMAsGA1UEChME Q05SUzEOMAwGA1UEAxMFQ05SUzKCAQAwDgYDVR0PAQH/BAQDAgEGMD4GA1UdHwQ3MDUwM6AxoC+G LWh0dHA6Ly9jcmxzLnNlcnZpY2VzLmNucnMuZnIvQ05SUzIvZ2V0ZGVyLmNybDANBgkqhkiG9w0B AQUFAAOCAQEAT+njF+ZMJ/UXalBV6u7PTKq97izddj5ZoC8LaInaQ9AeHSxrEvlnE55lK6SE0jHP gqDK7yLoEGzpzxd8rK2HhUyK4dV7TObZDrKh5CmeIK8PPnu5fyRMMuCI/nrarBZgoXWuiZyKZp2U un6rDiAj7ffHhF2CSBTexNSwxU4sh9SNAxEvNtUpb66ZZxkMjW1aIN/Rn8bLr1XuC8qxWw/vXHT0 80aJY0d+LM6/yDANAEb2GOZsPzB+kG4QjR85Sc+TaevInsJnc69Ki/Z8Qijdpd3tr8lVG2Q/VLxh JhDrkdXp9+7Q9gsL+qaQ3WD0QJ0Lp5z4zi8hOP6rBr/aDXf6ZzCCBLEwggOZoAMCAQICAlA7MA0G CSqGSIb3DQEBBQUAMDUxCzAJBgNVBAYTAkZSMQ0wCwYDVQQKEwRDTlJTMRcwFQYDVQQDEw5DTlJT Mi1TdGFuZGFyZDAeFw0xMjA0MjQxMTE2MDJaFw0xNDA0MjQxMTE2MDJaMGwxCzAJBgNVBAYTAkZS MQ0wCwYDVQQKEwRDTlJTMRAwDgYDVQQLEwdVTVI3NTg5MRUwEwYDVQQDEwxNaWNoZWwgVGFsb24x JTAjBgkqhkiG9w0BCQEWFnRhbG9uQGxwdGhlLmp1c3NpZXUuZnIwggEiMA0GCSqGSIb3DQEBAQUA A4IBDwAwggEKAoIBAQDgBxV/HgKdmPL6b8jVvUTR1SWD0aKiqo5WtdQqBIcmN2/dNqXbNt9YNznR Y4KLzV8VIFSj4WqDfzxCx6Xxulww7iwP8FE+Mt9NEQFtYoh9yZdokMTPQgYQ/sJTbvTSLK2f9IRV HCTnJkG1jRLzNKp9T+jbLpauKNX97jAzGFa5pqip0ARGduLmVTSEY4yDzgMjUXT/ghrA+emngSBW RDMj2nbcvPi5UqvbHv6oC/HrSl8YiN7zck9A7sWQqw8Dkzi7y5Az9cHaK5baoDJsmXtJjdE2poJU QFgj+qw5v1//rzWao6vF1Y2YuALbDk2rY0FGbHKBvQdUIOd9FPWVHcDhAgMBAAGjggGSMIIBjjAM BgNVHRMBAf8EAjAAMBEGCWCGSAGG+EIBAQQEAwIEsDAOBgNVHQ8BAf8EBAMCBeAwegYJYIZIAYb4 QgENBG0Wa0NlcnRpZmljYXQgQ05SUzItU3RhbmRhcmQuIFBvdXIgdG91dGUgaW5mb3JtYXRpb24g c2UgcmVwb3J0ZXIg4CBodHRwOi8vaWdjLnNlcnZpY2VzLmNucnMuZnIvQ05SUzItU3RhbmRhcmQv MB0GA1UdDgQWBBQVwmDyLZNTeQ9+lLkAnYAWHPUEyTBUBgNVHSMETTBLgBQR49nRUkcbWbE8G3hm a/ShiO0KW6EwpC4wLDELMAkGA1UEBhMCRlIxDTALBgNVBAoTBENOUlMxDjAMBgNVBAMTBUNOUlMy ggEDMCEGA1UdEQQaMBiBFnRhbG9uQGxwdGhlLmp1c3NpZXUuZnIwRwYDVR0fBEAwPjA8oDqgOIY2 aHR0cDovL2NybHMuc2VydmljZXMuY25ycy5mci9DTlJTMi1TdGFuZGFyZC9nZXRkZXIuY3JsMA0G CSqGSIb3DQEBBQUAA4IBAQBZqTWOw11I3rblql8PEPHhnPntu2IEg9DQRgP8jucvURw8KpZ7s94W 4hP13kmDhqGC4/St/XH4IlT86L64Zqt3toUoncLPjBfBYmQWGUgC08qhhuopLqsE1uvkdg5IX0bz RqOpEeybEpdrWrTs5DmGycZf93C1ud8PTLhSQYjYhGPfrOw5/3RNUQvL1yZK4ZaqzWucmvT9fjMW h24ofSN0sJyrBTInv30CzauKlIacgBtTfaMyQkoR1tch3hn57UI9w0/Ad5ywkdgFbA7PVBO12Bsi WHNpHVk1muWUYaGLYE7L4rvx1klv2uS+yQ7aJ1De9MtFy655R//GaJJlgfLvMYICXDCCAlgCAQEw OzA1MQswCQYDVQQGEwJGUjENMAsGA1UEChMEQ05SUzEXMBUGA1UEAxMOQ05SUzItU3RhbmRhcmQC AlA7MAkGBSsOAwIaBQCggfcwGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUx DxcNMTMwMTIzMjEyMjQ5WjAjBgkqhkiG9w0BCQQxFgQUy9jBJu0rTz6WuxCftuTwOGYHrm0wSgYJ KwYBBAGCNxAEMT0wOzA1MQswCQYDVQQGEwJGUjENMAsGA1UEChMEQ05SUzEXMBUGA1UEAxMOQ05S UzItU3RhbmRhcmQCAlA7MEwGCyqGSIb3DQEJEAILMT2gOzA1MQswCQYDVQQGEwJGUjENMAsGA1UE ChMEQ05SUzEXMBUGA1UEAxMOQ05SUzItU3RhbmRhcmQCAlA7MA0GCSqGSIb3DQEBAQUABIIBAMfe tJdTTuE0KCyT/icPW1slQ4MHlAaJl3/JIAHMZgdZ4Fp7F+csgaVN1arLhIg19e4KUuAbM6LmVCSm BBhlsVbwA7fxXC/PqBPr8V2EuXHF+qal0qBzxiXIBY0lOZA56ZdSiFR9ayie6zyk11hQQIzG2S2W 4t9y0pPZazgHNJyStzBoPH+CE8Tvu2ZAQRGRdxfgp3AX3REnM7bON2I34da3fK2qh+NjDCw3uuy/ WeDCOPXOmYlN74Lt7HR3rAspUardYYrNn8ZjIHQ4Blcy7UgGLvBWROf8aNQVN2SnPHQs8ypdMm5J eph5zqMujU/ZQ+GQwiN7m88EPRT581XOr+oAAAAAAAA= --Apple-Mail=_60D7FFA2-FBE5-4978-BAFE-C56FF486A309--
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