Configuring RAID

The software RAID mode is used to create RAID arrays on the metadata node and storage node by running the mdadm command. Virtual disks are used.

1. Create RAID 0 on node n2.

   fdisk /dev/vdb #Select n, keep pressing Enter, and type W to save the settings.
   fdisk /dev/vdc #Select n, keep pressing Enter, and type W to save the settings.
   mdadm -C /dev/md0 -ayes -l1 -n2 /dev/vd[b,c]1

2. Format md0, mount it to /data, and write it to fstab.

   mkfs.ext4 /dev/md0
   mkdir -p /data
   mount /dev/md0 /data
   echo /dev/md0 /data   ext4    defaults    0   0 | sudo tee -a /etc/fstab

3. Enable the extended attribute function.

   1	tune2fs -o user_xattr /dev/md0

4. Create RAID 6 on node n3 in the same way and mount it to /mnt/md0.

   1 2 3 4 5

   fdisk /dev/vdb #Select n, keep pressing Enter, and type W to save the settings. fdisk /dev/vdc #Select n, keep pressing Enter, and type W to save the settings. fdisk /dev/vdd #Select n, keep pressing Enter, and type W to save the settings. fdisk /dev/vde #Select n, keep pressing Enter, and type W to save the settings. mdadm -Cv /dev/md0 -ayes -l6 -n4 /dev/vd[b,c,d,e]1

5. Format md0, mount it to /mnt/md0, and write it to fstab.

   mkfs.xfs /dev/md0
   mkdir -p /mnt/md0
   mount /dev/md0 /mnt/md0
   echo /dev/md0 /mnt/md0  xfs defaults  0   0 | sudo tee -a /etc/fstab