RAID Hard Disk compinations

RAID Hard Disk compinations

  • Standard: optimizes the volume size when combining hard disks with different sizes. if the volume is composed of two or more hard disks, data integrity is protected when one of the hard disks fails.
  • Basic: uses only one hard disk to build a volume that does not have any data protection mechanism.
  • JBOD: combines at least 2 hard disks to build a volume. Available volume capacity equals to the total capacity of the composed disks. The advantage is it allows combining hard disks with different sizes. The disadvantage is it has worse performance than that of a RAID 0 volume.
  • RAID 0: combines at least 2 hard disks to build a volume, which is without any data protection mechanism. When one of the composed disks fails, the data in the volume cannot be rescued. Available volume capacity equals to the total capacity of the composed disks.
  • RAID 1: combines 2 – 4 hard disks to build a volume. The system will write identical data to each hard disk at the same time, so data integrity is protected when at least one disk is normal. Available volume capacity equals to the capacity of the smallest hard disk.
  • RAID 5: combines at least 3 hard disks to build a volume and stripes both data and parity information across the disks. Therefore, when one of the composed disks fails, the system can be rebuilt by using the parity information on the other disks, so data integrity is protected. Available volume capacity equals to (the capacity of the smallest hard disk) X (number of hard disks – 1)
  • RAID 5+Spare: combines at least 4 hard disks to build a volume. It uses 1 disk as the hot spare disk, and the remaining to create a RAID 5 volume. When one of the disks within the RAID 5 volume fails, the hot spare disk will be added to the RAID 5 volume automatically to ensure data integrity. Available volume capacity equals to (the capacity of the smallest hard disk) X (number of hard disks – 2)
  • RAID 6: combines at least 4 hard disks to build a volume and stripes both data and parity information across the disks. Therefore, when one or two of the composed disks fails, the system can be rebuilt by using the parity information on the other disks, so data integrity is protected. Available volume capacity equals to (the capacity of the smallest hard disk) X (number of hard disks – 2)
  • RAID 10: combines at least 4 hard disks to build a volume, and the number of disks must be even. RAID 10 has the performance of RAID 0 and data protection level of RAID 1. RAID 10 combines two hard disks into a group, in which data integrity is protected when one of the two hard disks fails. Available volume capacity equals to (the capacity of the smallest hard disk) X (number of hard disks / 2)
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