Date: Wed, 18 Dec 2019 10:22:16 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: ZFS and power management Message-ID: <57da15d4-0944-982b-7d7e-d7b2571e869c@denninger.net>
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This is a cryptographically signed message in MIME format. --------------ms000200040008000805060605 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I'm curious if anyone has come up with a way to do this... I have a system here that has two pools -- one comprised of SSD disks that are the "most commonly used" things including user home directories and mailboxes, and another that is comprised of very large things that are far less-commonly used (e.g. video data files, media, build environments for various devices, etc.) The second pool has perhaps two dozen filesystems that are mounted, but again, rarely accessed.=C2=A0 However, despite them being rarely accessed= ZFS performs various maintenance checkpoint functions on a nearly-continuous basis (it appears) because there's a low level, but not zero, amount of I/O traffic to and from them.=C2=A0 Thus if I set power control (e.g. spi= n down after 5 minutes of inactivity) they never do.=C2=A0 I could simply export the pool but I prefer (greatly) to not do that because some of the data on that pool (e.g. backups from PCs) is information that if a user wants to get to it it ought to "just work." Well, one disk is no big deal.=C2=A0 A rack full of them is another matte= r.=C2=A0 I could materially cut the power consumption of this box down (likely by a third or more) if those disks were spun down during 95% of the time the box is up, but with the "standard" way ZFS does things that doesn't appear to be possible. Has anyone taken a crack at changing the paradigm (e.g. using the automounter, perhaps?) to get around this? --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms000200040008000805060605 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 dWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExJTAjBgNVBAMMHEN1 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