Differences

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--- doc:appunti:hardware:raspberrypi_nas_smart_hard_disk [2021/03/22 09:25] – [Raspberry Pi NAS: Hard disk management] niccolo
+++ doc:appunti:hardware:raspberrypi_nas_smart_hard_disk [2021/04/16 15:18] – [hdparm] niccolo
@@ Line 20: / 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 97: / 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 117: / 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