# [OmniOS-discuss] illumos power management

Paul B. Henson henson at acm.org
Tue Nov 12 22:52:17 UTC 2013

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    I think the storage server I'm working on at home (current omnios stable) is
    spinning down disks; whenever I get back to it after not touching it for a
    while, anything touching my export pool (dual 6 x 3TB WD Red RAIDZ2) takes a
    long time to respond, and then goes back to normal.

    My current power.conf is:

    -----
    autopm                  enable
    autoS3                  disable

    cpupm                   enable
    cpu_deep_idle           enable
    cpu-threshold           1s
    -----

    I had thought that when running on server class hardware the default was not
    to spin down drives, but perhaps I was mistaken? Hmm, or maybe the default
    is to just skip power management completely, and explicitly turning it on
    turned on everything.

    I'm thinking about adding "system-threshold always-on" to the configuration,
    which I guess will disable all power down functionality, other than CPU,
    which is controlled by the "cpu-threshold" parameter? What other power
    savings would this turnoff? I am in general in favor of saving energy :),
    other than for the disks, as the latency is too high and causes too much of
    a delay, and it's not clear if setting the system-threshold to stop spinning
    down disks will also disable other potentially desirable power savings. I
    guess the other option would be to explicitly configure device-thresholds
    for all of the disks individually. Is there any way to list what components
    of a system support power management?

    While on the subject, any thoughts on event-mode vs poll-mode for cpupm?
    It's not clear from the man page what the default is if you just set it to
    "enable".

    Thanks.

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