doc release 0.5.3

1 files changed, 62 insertions, 4 deletions

diff --git a/tools/storage.html b/tools/storage.html
index 932e724..3a0a064 100644
--- a/tools/storage.html
+++ b/tools/storage.html
@@ -11,16 +11,73 @@
 
         <h2 id="fsck">1. Maintenance</h2>
 
-        <p>SMART provides statistics of disk firmware, this system
-        handle errors has their occur. Badblocks detect bad blocks
-        by writing and reading from disk in a destructive test.
-        Example of how to view SMART statistics of a disk;</p>
+        <p>SMART provides statistics of disk firmware,
+        this system handle errors has their occur. Badblocks        are detected by writing and reading from disk in
+        a destructive test. Example of how to view SMART
+        statistics of a disk;</p>
 
         <pre>
         # smartctl -t long /dev/sdb1
         # smartctl -a /dev/sdb1 | less
         </pre>
 
+        <p>Mechanical hard drives spindown disks
+        and put heads in hold position to save energy
+        and protect the disk. This spindow spinup
+        can shorter the life expectancy of the hard
+        drive. Relevant output from hdparm;</p>
+
+        <pre>
+        # hdparm -I /dev/sda | grep "Advanced power management level"
+        # hdparm -I /dev/sda | grep "Recommended acoustic management value"
+        </pre>
+
+
+        <p>Settings with hdparm [options] [device];</p>
+
+        <dl>
+            <dt>-B</dt>
+
+            <dd>Set the Advanced Power Management feature.
+            Possible values are between 1 and 255, low
+            values mean more aggressive power management
+            and higher values mean better performance.
+            Values from 1 to 127 permit spin-down, whereas
+            values from 128 to 254 do not. A value of 255
+            completely disables the feature.</dd>
+
+            <dt>-S</dt>
+
+            <dd>Set the standby (spindown) timeout for
+            the drive. The timeout specifies how long to
+            wait in idle (with no disk activity) before
+            turning off the motor to save power. The value
+            of 0 disables spindown, the values from 1 to
+            240 specify multiples of 5 seconds and values
+            from 241 to 251 specify multiples of 30
+            minutes.</dd>
+
+            <dt>-M</dt>
+
+            <dd>Set the Automatic Acoustic Management
+            feature. Most modern hard disk drives have the
+            ability to speed down the head movements to
+            reduce their noise output. The possible value
+            depends on the disk, some disks may not support
+            this feature.</dd>
+        </dl>
+
+        <pre>
+        # hdparm -S 0 /dev/sda
+        # hdparm -B 255 /dev/sda
+        </pre>
+
+        <p>Set persistent values using udev, edit /etc/udev/rules.d/69-hdparm.rules;</p>
+
+        <pre>
+        ACTION=="add", SUBSYSTEM=="block", KERNEL=="sda", RUN=="/usr/bin/hdparm -B 255 -S 0 /dev/sda"
+        </pre>
+
         <p>Search for bad blocks using
         <a href="https://wiki.archlinux.org/index.php/Badblocks">non destructive test;</a></p>
 
@@ -28,6 +85,7 @@
         # badblocks -nsv /dev/sdb1
         </pre>
 
+
         <h2 id="mv">2. Moving data</h2>
 
         <p>Temp partition with 20M-50M;</p>