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mdadmxfs [2023/11/06 10:14] – normanmdadmxfs [2025/10/31 13:56] (current) – [Creating the initial 3 drive array] norman
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 ===== Creating the initial 3 drive array ===== ===== Creating the initial 3 drive array =====
  
-First, create empty partitions to all drives: +Created a RAID5 array:
- +
-<code>fdisk /dev/sdX +
-n # Create a new partition +
-p # Primary +
-1 # First partition +
-[enter] # Starting point to first sector (default) +
-[enter] # Ending point to last sector (default) +
-t # Change partition type +
-fd # Type: Linux raid autodetect +
-w # Write changes to disc</code> +
- +
-When empty RAID partitions have been created to all three discs, I created a RAID5 array:+
  
 <code>mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1</code> <code>mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1</code>
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 Now the RAID array is ready to use, and mounted automatically to /raid directory after every boot. Now the RAID array is ready to use, and mounted automatically to /raid directory after every boot.
  
 +====== Debian need: ======
 +
 +<code>
 +update-initramfs -u
 +</code>
  
 ===== Adding a new drive to the array ===== ===== Adding a new drive to the array =====
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 Let's imagine that now you have a new drive, /dev/sde, which you want to add to the previously created array without losing any data. Let's imagine that now you have a new drive, /dev/sde, which you want to add to the previously created array without losing any data.
  
-First the new drive needs to be partitioned as all the other drives: +Add to the RAID array:
- +
-<code>fdisk /dev/sde +
-n # Create a new partition +
-p # Primary +
-1 # First partition +
-[enter] # Starting point to first sector (default) +
-[enter] # Ending point to last sector (default) +
-t # Change partition type +
-fd # Type: Linux raid autodetect +
-w # Write changes to disc</code> +
- +
-Then it needs to be added to the RAID array:+
  
 <code>mdadm --add /dev/md0 /dev/sde1</code> <code>mdadm --add /dev/md0 /dev/sde1</code>
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 Let's imagine that the new size is now 764 (can be seen from "Total PE"). Now expand the logical volume to cover this: Let's imagine that the new size is now 764 (can be seen from "Total PE"). Now expand the logical volume to cover this:
  
-<code>lvextend /dev/mapper/vg_raid-lv_raid -l 764</code>+<code>lvextend /dev/mapper/vd_raid-lv_raid -l 764</code>
  
 Then expand the XFS file system. This needs to be done during the file system is online and mounted: Then expand the XFS file system. This needs to be done during the file system is online and mounted: