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mdadm [2023/11/17 13:46] – [Speed Up or Slow Down Raid rebuild] normanmdadm [2025/06/20 11:25] (current) – [“not enough to start the array” – error while staring mdadm RAID array] norman
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 ====== Mdadm Helpers ====== ====== Mdadm Helpers ======
 +
 +*************
 +
 +===== Debian Disable/Enable Raid Monthly Checks =====
 +
 +<code>dpkg-reconfigure mdadm</code>
 +
 +or edit cron job
 +
 +<code>nano /etc/cron.d/mdadm</code>
 +
 +[[https://askubuntu.com/questions/1304738/mdadm-checking-raid-5-array-after-each-restart|External Link]]
 +
 +
  
 ===== How do I replace a disk marked as removed from a linux md raid-5 array ===== ===== How do I replace a disk marked as removed from a linux md raid-5 array =====
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  Assemble the pre-existing array:  Assemble the pre-existing array:
 <code>mdadm -A -f /dev/md0</code> <code>mdadm -A -f /dev/md0</code>
 +
 +
 +RUN raid 1 with one disk:
 +<code>
 +mdadm --run /dev/md126
 +</code>
 +
 +Then Add disk:
 +<code>
 +mdadm --manage /dev/md126 --add /dev/sdf4
 +</code>
  
 ====== Test Email Settings ====== ====== Test Email Settings ======
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 Removing the spares=1 option or just recreating the mdadm.conf from scratch fixes the problem: Removing the spares=1 option or just recreating the mdadm.conf from scratch fixes the problem:
 +
 +====== **Update MDADM config file** ======
 +
  
 <code>/usr/share/mdadm/mkconf > /etc/mdadm/mdadm.conf.copy</code> <code>/usr/share/mdadm/mkconf > /etc/mdadm/mdadm.conf.copy</code>
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 Double check new configuration ad then save as mdadm.conf Double check new configuration ad then save as mdadm.conf
  
 +====== **Just in case** ======
  
 +Run <code>update-initramfs -u</code>
 ====== Speed Up or Slow Down Raid rebuild ====== ====== Speed Up or Slow Down Raid rebuild ======
  
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-===== Speed Change Script Demo =====+===== Speed Change Script Example =====
  
  
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 tput setaf 2 tput setaf 2
 tput bold tput bold
-if [[ $speed == '200000' ]]; then +if [[ $speed == '150000' ]]; then 
-    sysctl -w dev.raid.speed_limit_max=15000 | cut -c 28- | sed  -e   's/^/                 /'+    sysctl -w dev.raid.speed_limit_max=10000 | cut -c 28- | sed  -e   's/^/                 /' 
 +    sysctl -w dev.raid.speed_limit_min=1000  | cut -c 28- | sed  -e   's/^/                 /'
 else else
-    sysctl -w dev.raid.speed_limit_max=200000 | cut -c 28- | sed  -e 's/^/                 /'+    sysctl -w dev.raid.speed_limit_max=150000 | cut -c 28- | sed  -e 's/^/                 /' 
 +    sysctl -w dev.raid.speed_limit_min=10000  | cut -c 28- | sed  -e   's/^/                 /'
 fi fi
 +
 tput sgr0 tput sgr0
 </code> </code>