Differences

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--- doc:appunti:hardware:raspberrypi_nas_smart_hard_disk [2021/03/11 09:44] – [smartctl] niccolo
+++ doc:appunti:hardware:raspberrypi_nas_smart_hard_disk [2021/04/16 15:18] – [hdparm] niccolo
@@ Line 1: / Line 1: @@
 ====== Raspberry Pi NAS: Hard disk management ======
+This page is about configuring the **hard disk power management** on a Raspberry Pi, to be used as NAS and mediacenter. The hard disk is connected via a **[[raspberrypi_nas_x835_sata_board|SupTronics X835 shield]]**. See the main index at **[[raspberrypi_nas]]**.
 There are two tools to manage SATA disks in GNU/Linux. **smartctl** is designed to interact with the **[[wp>S.M.A.R.T.]]** capabilities of a disk. **hdparm** is a command line interface to the Linux kernel SATA subsystem, including Advanced Power Management.
@@ Line 18: / Line 20: @@
 # Disable DEVICESCAN, which does not work in our environment.
 #DEVICESCAN -d removable -n standby -m root -M exec /usr/share/smartmontools/smartd-runner
-# Send an email test to <root@localhost> on daemon start.
-/dev/sda -d sat -m root@localhost -M test
 # Use the suggedested subset of checks, instead of the '-a'.
+# NOTICE: We are running smartd with option --interval=3600 instead of the
+# 1800 default, i.e. device polling occurs every 1 our instead of 30 minutes.
+# The number of skipped checks (option -n) must be multipled by that value
+# to obtain the maximum time that checks will be skipped:
+# 336 * 3600 seconds = 14 days.
 /dev/sda -d sat \
     -H \                # Check the health with the SMART RETURN STATUS command
@@ Line 95: / Line 99: @@
 </code>
-Regardless of the APM level, we can set the hard disk **Standby timer** (spindown) after 30 minutes of inactivity. See **man hdparm** for explanation of the number following the **%%-S%%** option (it seems that there is not way to know the timeout once you have set it):
+Regardless of the APM level, we can set the hard disk **Standby timer** (spindown) after 30 minutes of inactivity. See **man hdparm** for explanation of the number following the **%%-S%%** option (the granularity of the timer up to 20 minutes is 5 seconds, above that threshold it is 30 minutes). It seems that there is not way to know the timeout once you have set it.
 <code>
@@ Line 115: / Line 119: @@
 # It is advisable to disable write cache in this case.
 # See man hdparm(8), -S and -W options.
+# The granularity of the spindown_time up to 20 minutes is 5
+# seconds, above that threshold it is 30 minutes.
 /dev/sda {
         write_cache = off
@@ Line 159: / Line 165: @@
   * **[[https://www.thomas-krenn.com/en/wiki/SMART_tests_with_smartctl|SMART tests with smartctl]]**
+  * **[[https://serverfault.com/questions/275364/get-drive-power-state-without-waking-it-up/|Get drive power state without waking it up]]**
+  * **[[https://unix.stackexchange.com/questions/366438/hard-disk-not-going-to-standby-automatically|Hard disk not going to standby automatically]]**
+  * **[[https://serverfault.com/questions/305847/how-to-determine-disc-spindown-time|How to determine disc spindown time]]**