Date: Sun, 5 Jan 2020 17:24:50 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Re: ZFS and power management Message-ID: <b08e3bd2-4b4e-34b0-49d9-7dc5de4e4f62@denninger.net> In-Reply-To: <op.0dxw77qjaas8k8@localhost> References: <57da15d4-0944-982b-7d7e-d7b2571e869c@denninger.net> <op.0dxw77qjaas8k8@localhost>
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This is a cryptographically signed message in MIME format. --------------ms080408090603080108000704 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 1/5/2020 16:10, Peter wrote: > On Wed, 18 Dec 2019 17:22:16 +0100, Karl Denninger > <karl@denninger.net> wrote: > >> 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 directori= es >> 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.) > > I'm using such a configuration for more than 10 years already, and > didn't perceive the problems You describe. > Disks are powered down with gstopd or other means, and they stay > powered down until filesystems in the pool are actively accessed. > A difficulty for me was that postgres autovacuum must be completeley > disabled if there are tablespaces on the quiesced pools. Another thing > that comes to mind is smartctl in daemon mode (but I never used that). > There are probably a whole bunch more of potential culprits, so I > suggest You work thru all the housekeeping stuff (daemons, cronjobs, > etc.) to find it. I found a number of things and managed to kill them off in terms of active access, and now it is behaving.=C2=A0 I'm using "camcontrol idle -= t 240 da{xxx}", which interestingly enough appears NOT to survive a reboot, but otherwise does what's expected. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms080408090603080108000704 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 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