Created
July 15, 2014 03:08
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bash: detect SSD/HDD and set appropriate disk scheduler
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| # set disk scheduler | |
| sed -i "/^echo .*queue\/scheduler$/d" /etc/rc.local | |
| for d in /dev/sd? | |
| do | |
| device=${d/\/dev\//} | |
| rotational=$(cat /sys/block/${device}/queue/rotational) | |
| if [ "$rotational" = "0" ] ; then | |
| echo noop > /sys/block/${device}/queue/scheduler | |
| echo "echo noop > /sys/block/${device}/queue/scheduler" >> /etc/rc.local | |
| echo "Set SSD $d scheduler to 'noop'." | |
| elif [ "$rotational" = "1" ] ; then | |
| echo deadline > /sys/block/${device}/queue/scheduler | |
| echo "echo deadline > /sys/block/${device}/queue/scheduler" >> /etc/rc.local | |
| echo "Set HDD $d scheduler to 'deadline'." | |
| else | |
| echo "Unknown device type (SSD/HDD) for $d: No changes made to scheduler." | |
| fi | |
| done |
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