RAID 0+1 or RAID 01

RAID 01 is a concatenation of 2 RAID systems. RAID 0 and RAID 1.

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Function of RAID 0+1

This system allows a secure storage, thanks to the RAID 1, but also a faster reading and writing, thanks to the RAID 0.

It's less reliable than a RAID 10, because if a HDD is down, it will cause the whole pair failure.

In a RAID 01, files are divided in blocks of X sectors. The first block is written on the first HDD of a pair, the second block is written on the second HDD of the same pair, and so on (a pair is a RAID 0). Then this pair is cloned on another pair (the two pairs are like a mirror, this is a RAID 1). This system offers reliability and good speed.

RAID 0+1 failures

A RAID 01 is less secure than a RAID 10.

The common RAID 01 failures are :

  • Loss of the RAID configuration
  • All the HDDs of the same pair are down
  • Wrong RAID reconfiguration