docs: create midgard storage documentation
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midgard/storage.md
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midgard/storage.md
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# [midgard] Stockage
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## Schéma de partitionnement cible
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- **vda** (disque système cloud-init) 10G
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- vda14 (BIOS boot)
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- vda15 (EFI)
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- vda1 (partition racine /)
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- **vdb** (disque secondaire LVM) 5G
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### Schéma de partitionnement LVM
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- **data** (LVM volume group) : **vdb**
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- **pgdata** (LVM logical volume) : 4G
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- **pglog** (LVM logical volume) : 1G
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## Initialisation LVM pour le disque secondaire
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Création du *physical volume* **vdb**
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`sudo pvcreate /dev/vdb`
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Création du *volume groupe* **data**
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`sudo vgcreate data /dev/vdb`
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Création des *logical volumes* **pgdata** et **pglog**
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`sudo lvcreate -L 4G -n pgdata data`
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`sudo lvcreate -l+100%FREE -n pglog data`
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### Formatage et montage des volumes de données
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Formatage les deux volumes en EXT4
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`sudo mkfs.ext4 /dev/data/pgdata`
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`sudo mkfs.ext4 /dev/data/pgdata`
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Création des répertoires `/data/pgdata` et `/data/pglog`
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`sudo mkdir -p /data/pgdata /data/pglog`
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Montage des volumes. Via `/etc/fstab`
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```
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/dev/data/pgdata /data/pgdata ext4 rw,discard,errors=remount-ro,x-systemd.growfs 0 1
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/dev/data/pglog /data/pglog ext4 rw,discard,errors=remount-ro,x-systemd.growfs 0 1
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```
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`sudo mount /data/pgdata`
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`sudo mount /data/pglog`
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