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raspberry [2016/03/30 08:09] – [Run fstrim weekly] niziakhome_automation:raspberry:card_wear [2016/11/15 06:43] – raspberry renamed to home_automation:raspberry:card_wear niziak
Line 1: Line 1:
-==== Reduce SD Card wearing ==== +====== Reduce SD Card wearing ====== 
-[[https://www.debian-administration.org/article/661/A_transient_/var/log|Transient log]] +[[https://www.debian-administration.org/article/661/A_transient_/var/log|Transient log]] \\ 
-[[https://wiki.gentoo.org/wiki/SDCard|Finding SD card erase size]]+[[https://wiki.gentoo.org/wiki/SDCard|Finding SD card erase size]] \\
  
 +===== Check who is writing =====
 +Start logging disc access and kernel log:
 +<code bash>
 +sysctl vm.block_dump=1
 +dmesg -e -T -w 
 +</code>
  
-<code>apt-get remove anacron</code> +Stop logging: 
- +<code bash> 
-Remove syslog +sysctl vm.block_dump=0
-<code>dpkg --purge rsyslog</code> +
- +
-Use syslog from busybox package with circular log buffer in RAM: +
-<code> +
-apt-get install busybox-syslogd+
 </code> </code>
  
-Use journald and configure it to use RAM + 
-<file | /etc/systemd/journald.conf> +===== Set noop elevator ===== 
-Storage=volatile +<file | /etc/rc.local> 
-Compress=yes+... 
 +echo noop > /sys/block/mmcblk0/queue/scheduler 
 +exit 0
 </file> </file>
  
 +===== Use tmpfs =====
 <file | /etc/fstab> <file | /etc/fstab>
-tmpfs           /tmp            tmpfs   defaults,nosuid,nodev,mode=1777,size=10%        0       0+tmpfs   /tmp                     tmpfs   defaults,nosuid,nodev,mode=1777,size=10%        0       0 
 +tmpfs   /var/tmp                 tmpfs   defaults,nosuid,nodev,mode=1777,size=10%        0       0 
 +tmpfs   /var/cache/apt/archives  tmpfs   defaults,nosuid,nodev,mode=1777,size=80%        0       0
 </file> </file>
  
-Move some volatile dirs to tmp folder+Move some volatile dirs to tmp folder:
 <code bash> <code bash>
 rm -rf /var/run /var/lock rm -rf /var/run /var/lock
Line 37: Line 43:
 </code> </code>
  
-==== Run fstrim weekly ====+ 
 +===== Disable logging to disc ===== 
 + 
 +<code bash> 
 +systemctl stop mosquitto 
 +systemctl disable mosquitto 
 +</code> 
 + 
 +<code>apt-get remove anacron</code> 
 + 
 +Remove syslog 
 +<code>dpkg --purge rsyslog</code> 
 + 
 +Use syslog from busybox package with circular log buffer in RAM: 
 +<code> 
 +apt-get install busybox-syslogd 
 +</code> 
 + 
 +Use journald and configure it to use RAM: 
 +<file | /etc/systemd/journald.conf> 
 +Storage=volatile 
 +Compress=yes 
 +</file> 
 + 
 + 
 +===== Run fstrim weekly ===== 
 +Check TRIM support 
 +<code>sudo hdparm -I /dev/sda | grep "TRIM supported"</code> 
 <file | /etc/systemd/system/fstrim.service> <file | /etc/systemd/system/fstrim.service>
 [Unit] [Unit]
Line 64: Line 98:
 systemctl enable fstrim.timer systemctl enable fstrim.timer
 </code> </code>
-==== Broken SD Card ====+ 
 +===== Broken SD Card =====
 Bad magic number in super-block Bad magic number in super-block