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How do I issue a spindown / standby command to the cache drive / pool?

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Sending a disk to sleep is easy:

mdcmd spindown 0
mdcmd spindown 1


I tried to reverse engineer the icon click, but was not successful. As an example. Clicking the icon calls "http://tower/webGui/include/ToggleState.php" with the following POST content:



As "device" has been set to "Device" it calls this line in "ToggleState.php":

if ($name) emhttpd("cmdSpin$action=$name"); else emhttpd("cmdSpin{$device}All=true");


Which executes curl:

  $ch = curl_init("$cmd&startState=$state&csrf_token=$csrf");
  curl_setopt_array($ch, [CURLOPT_UNIX_SOCKET_PATH => '/var/run/emhttpd.socket', CURLOPT_RETURNTRANSFER => true]);


The update.htm part confuses me as a static HTML page is not able to execute anything. Maybe this is rewritten through the NGINX webserver?!


Whatever... I tried to find the "cmdSpin" string in the Unraid Source Code and was only successful in the unassigned devices plugin:

function spin_disk($down, $dev) {
    if ($down) {
        exec("/usr/local/sbin/emcmd cmdSpindown=$dev");
    } else {
        exec("/usr/local/sbin/emcmd cmdSpinup=$dev");



Ok. This command works:

/usr/local/sbin/emcmd cmdSpindown=cache


Why isn't this mentioned anywhere? ^^

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