Ubuntu Sverige

Kod: Markera allt

sg_start --stop /dev/sda1

Kod: Markera allt

#!/usr/bin/perl
use POSIX qw(strftime);

$timeout = 1 * 60;

#$timeout = 3;

# device to use
$devicelist = "sda";


#################################


foreach $device (split(',', $devicelist)) {
  $lastRCount{$device}=0;
  $lastATime{$device}=0;
  $sleepTime{$device}=0;
 }

while (true) {
 foreach $device (split(',', $devicelist)) {
     open F, "< /sys/block/" . $device . "/device/iorequest_cnt";
        $requestCount{$device} = hex <F>;
      close F;
        $now=strftime "%s", localtime;
      if ($requestCount{$device} != $lastRCount{$device}) {
        $lastATime{$device} = $now;
    }

     # if we are after the timeout and there were new
     # accesses after the last sleep time -> go to sleep (again)
   if ($now > $lastATime{$device} + $timeout && $lastATime{$device} > $sleepTime{$device}) {
   $sleepTime{$device} = $now;
##    system "logger -i -t scsi_idle sending $device to sleep";
  system "/usr/bin/sg_start 0 -pc=3 /dev/$device";
  ##    system "/usr/bin/sg_start 0 /dev/$device";
                                
      # increase the request count by one for the command we just sent
           $requestCount{$device}++;
          }
     $lastRCount{$device}=$requestCount{$device};
   }
   sleep 60;
}

Kod: Markera allt

root@Sandnabba.se: /home/emil # hdparm -S 30 /dev/hdc

/dev/hdc:
 setting standby to 30 (2 minutes + 30 seconds)