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Sata

SATA is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives, optical drives, and solid-state drives. Serial ATA succeeded the earlier Parallel ATA (PATA) standard to become the predominant interface for storage devices.

Interface test methods​

Read and write tests​

  • Install the hdparm utility
sudo apt-get install hdparm
``

- Testing read speed

``bash
sudo hdparm -t /dev/sdX
  • Testing write speed
sudo hdparm -tT --direct /dev/sdX

Group raid 5 array​

  • Inserting 4 sata drives into the ROCK 5 ITX sata interface

  • Install mdadm

sudo apt-get update
sudo apt-get install mdadm
  • Creating a RAID 0 Array

Use the following command to create a RAID 5 array. This will create a RAID device named /dev/md0:

sudo mdadm --create /dev/md0 --level=5 --raid-devices=4 /dev/sdX1 /dev/sdX1 /dev/sdX1 /dev/sdX1 /dev/sdX1

After executing this command, the system will ask if you want to continue. Type y and press Enter.

  • Checking the RAID Status

After creating a RAID, you can use the following command to check its status:

cat /proc/mdstat
  • Formatting a RAID device

Before using a RAID device, it needs to be formatted. For example, to format a RAID device using the ext4 file system, execute the following command:

sudo mkfs.ext4 /dev/md0
``

- Mounting the RAID Device

Create a mount point and mount the RAID device:

```bash
sudo mkdir /mnt/raid
sudo mount /dev/md0 /mnt/raid
``

- Automounting

To automatically mount the RAID device when the system boots, you need to add it to the /etc/fstab file. Open the file and add the following line:

```bash
/dev/md0 /mnt/raid ext4 defaults 0 0
  • Saving the RAID Configuration

Finally, save the RAID configuration to preserve the RAID array after a reboot

sudo mdadm --detail --scan | sudo tee -a /etc/mdadm/mdadm.conf
  • Update initialise ramdisk
sudo update-initramfs -u

RAID 0 provides high performance read and write capability, but does not provide redundancy. If one of the drives fails, all data will be lost.

  • Change the user group
sudo chown -R radxa:radxa /mnt/raid/
  • Remove a RAID-5 array
sudo mdadm --remove /dev/md0
sudo mdadm --stop /dev/md0
sudo mdadm --zero-superblock /dev/sda1 # clear superblock information
sudo mdadm --zero-superblock /dev/sdb1
sudo mdadm --zero-superblock /dev/sdc1
sudo mdadm --zero-superblock /dev/sdd1