Differences

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--- doc:appunti:hardware:raspberrypi_nas_smart_hard_disk [2025/10/08 06:59] – [hdparm] niccolo
+++ doc:appunti:hardware:raspberrypi_nas_smart_hard_disk [2025/12/09 09:37] (current) – [smartctl] 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]]**.
+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]]**. The operating system is **RaspiOS** based on **Debian 11 Bullseye**.
 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 26: / Line 26: @@
 # 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.
+# 1 hour interval * 168 times = 7 days.
 /dev/sda -d sat \
     -H \                # Check the health with the SMART RETURN STATUS command
@@ Line 32: / Line 32: @@
     -l error \          # Report increasing errors number in the Summary SMART error log
     -f \                # Check for 'failure' of any Usage Attributes
-    -n standby,336 \    # Skip smartd checks during standby (max 336 times, add ',q' for quiet)
+    -n standby,168 \    # Skip smartd checks during standby (max 168 times, add ',q' for quiet)
     -W 0,50,60 \        # Temperature (SMART att. 194): WARN=50 (log), CRIT=60 (mail)
-    -s S/../../1/23 \   # Schedule a short Self-Test at 23:00 of every monday.
+       \                # Schedule a short Self-Test at 23:00 of every monday.
-    -s O/../.././21 \   # Schedule an Offline Immediate Test every day at 21:00.
+       \                # Schedule an Offline Immediate Test every day at 21:00.
+    -s (S/../../1/23|O/../.././21) \
     -m root@localhost \ # Send a warning email on failures and errors
     -M daily \          # Repeat email warnings daily
@@ Line 161: / Line 162: @@
   * **updatedb** - Execute by the **/etc/cron.daily/mlocate** cronjob, will update the database of files stored on hard disk. Add the directory to be skipped into **/etc/updatedb.conf**.
   * **smartctl** - Reading SMART attributes (e.g. disk temperature, errors log) awake the disk. You may have periodic checks executed by **snmpd**, etc.
+===== udisks2.service =====
+It seems that the **udisks2.service** may interfere with the hard disk spin-down feature. The ''man 8 udisks'' refers to setting APT options (//StandbyTimeout//, //APMLevel//, ...) via ATA commands.
+It is likely that the hdparm options set by **udev** on system start are overridden by udisks2. In a [[..:software:kodi_installation_raspios_13|system based on RaspiOS 13 Trixie]] I had to remove the **udisks2** package to allow the hard drive to go into standby mode as epxlained above.
+Some useful udisks2 commands:
+<code>
+udisksctl info -b /dev/sda3
+</code>
 ===== Web References =====