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@@ -160,4 +160,49 @@ Configure HTTPS on reverse-proxy.
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Apps are not working (example from my own migration : *Contacts* and *Tasks* not working because of javascript file not found.
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-I had some errors after `rsync` about those files. That might be related.
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+I had some errors after `rsync` about those files. That might be related.
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+
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+## Manage disks
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+
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+### Check health
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+
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+#### Check RAID
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+
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+```
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+cat /proc/mdstat
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+```
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+
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+#### Check individual HDD
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+
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+```
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+smartctl --scan
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+sudo smartctl -a /dev/sdc
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+```
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+
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+If one the tested disk is failing, write down its serial number and continue with the replacement procedure.
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+
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+### Replace the disk
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+
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+0. RAID disconnection
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+ 01. `cat /proc/mdstat`
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+ 02. `mdadm --manage /dev/md0 --fail /dev/sdy1`
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+ 03. `cat /proc/mdstat`
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+ 04. `mdadm --manage /dev/md0 --remove /dev/sdy1`
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+ 05. `cat /proc/mdstat`
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+1. Physical replacement
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+ 11. Shut down the server
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+ 12. Spot the HDD to remove based on its serial number
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+ 13. Replace it by the new one
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+ 14. Boot the server
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+ 15. Mark the retrieved HDD as dead
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+2. RAID update
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+ 21. `cat /proc/mdstat`
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+ 22. Become superuser
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+ 23. `fdisk -l` -> spot the device with no partition `/dev/sdz`
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+ 24. Copy partition information
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+ 241. For MBR partitioning (legacy) : `sfdisk -d /dev/sdx | sfdisk /dev/sdz`
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+ 242. For GPT partitioning : `sgdisk -R /dev/sdz /dev/sdx` then `sgdisk -G /dev/sdz`
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+ 25. `fdisk -l` -> check that `/dev/sdz` is partitioned
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+ 26. `mdadm --manage /dev/md0 --add /dev/sdz1`
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+ 27. `cat /proc/mdstat`
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+ 28. Hope you first disk won't die during recovery
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