Date: Fri, 27 Mar 2020 19:45:25 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-questions@freebsd.org Subject: Re: drive selection for disk arrays Message-ID: <8e74482f-b951-ee97-50b8-04ea1f0d46a3@denninger.net> In-Reply-To: <1bcd7aa2-31e5-91f1-5151-926c9d16e16e@holgerdanske.com> References: <20200325081814.GK35528@mithril.foucry.net> <713db821-8f69-b41a-75b7-a412a0824c43@holgerdanske.com> <20200326124648725158537@bob.proulx.com> <alpine.BSF.2.21.9999.2003261630030.47777@mail2.nber.org> <20200327104555.1d6d7cd9.freebsd@edvax.de> <1bcd7aa2-31e5-91f1-5151-926c9d16e16e@holgerdanske.com>
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This is a cryptographically signed message in MIME format. --------------ms050602030405010701040707 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 3/27/2020 19:39, David Christensen wrote: > On 2020-03-27 02:45, Polytropon wrote: > >> When a drive _reports_ bad sectors, at least in the past >> it was an indication that it already _has_ lots of them. >> The drive's firmware will remap bad sectors to spare >> sectors, so "no error" so far.=20 > > If a drive detects an error, my guess is that it will report the error > to the OS; regardless of the outcome of a particular I/O operation > (data read, data written, data lost) or internal actions taken (block > marked bad, block remapped, etc.).=C2=A0 It is then up to the OS to dec= ide > what to do next.=C2=A0 RAID and/or ZFS offer the means for shielding th= e > application from I/O and drive failures. > Yes, but... Those drives that can do "SMART" will report (if you have a patrol daemon for it running) if they do a "silent" sector reassignment.=C2=A0 Otherwise the OS is none the wiser and neither is ZFS (or anything else.)=C2=A0 Needless to say if reassignments increase you might want to think about swapping the drive *before* it blows up! I have the daemon running on all my machines.=C2=A0 It works nicely and h= as warned me a few times over the years.=C2=A0 With that said it doesn't ALW= AYS catch a drive before it pukes. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms050602030405010701040707 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 DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf BgNVBAMMGEN1ZGEgU3lzdGVtcyBMTEMgMjAxNyBDQTAeFw0xNzA4MTcxNjQyMTdaFw0yNzA4 MTUxNjQyMTdaMHsxCzAJBgNVBAYTAlVTMRAwDgYDVQQIDAdGbG9yaWRhMRkwFwYDVQQKDBBD 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