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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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]/
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