Re: hd sleep mode

From: Damion de Soto (damion_at_cyberguard.com.au)
Date: 09/26/05

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    Date: Mon, 26 Sep 2005 11:45:09 +1000

    Hi,
    > Is there anyway to get a hd out of sleep mode after putting it into
    > that without a warm reboot?
    >
    > We have an embedded system that runs in cold tempertures, when the hard
    > disk gets too cold, we put the hd into sleep and run out of CF, but
    > when the temperture warms up, we want to get the hd back to usage
    > without a reboot. Possible?
    Is there any reason you can't use Standby mode instead of Sleep mode?
    The disk still spins down, and you wouldn't have the trouble
    of having to issue a reset to get it back online.

    However, I've just re-read the hdparm man page, and it seems to be
    different to last time I used standby/sleep mode:

        -Y Force an IDE drive to immediately enter the lowest power consumption
            sleep mode, causing it to shut down completely. A hard or soft reset is
            required before the drive can be accessed again (the Linux IDE driver will
            automatically handle issuing a reset if/when needed). The current power mode
            status can be checked using the -C flag.

    The part in brackets seems to imply the kernel can issue the reset and get the drive
    back online.
    Perhaps this is a new feature you should investigate..

    Regards, 

    -- 
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