How to remember RAID levels? [duplicate]

Solution 1:

0 - S (stripe)

1 - M (mirror)

5 - P (parity)

10 - MS (mirror + stripe)

Smart Men Pay MicroSoft

or

Silly Men Pay MicroSoft

Solution 2:

Remember it like this:

Solution 3:

I remember them in order by the number of punches in the face a failure of any particular level equates to:

RAID 6 - six punches in the face when it fails, because you had two dang parity drives and thought you were really uber safe....until your Adaptec controller said "no arrays detected".

RAID 5 - five punches in the face when it fails, especially when your Adaptec controller says "no arrays detected"....or a second drive fails during a rebuild.

RAID 1 - one punch in the face, especially if you were using a hardware controller and thought you could just take a drive out and grab the data easily...because, hey, it's just a mirror, right?

RAID 0 - zero punches in the face, because you were expecting it and had full backups.

P.S. I do not work for Adaptec.

Solution 4:

0 = No Redundancy

1 = 100% = 100% Redundancy

10 = 1 and 0 together

5 = halfway in-between 0 and 10 (0 uses 4/4 disks, 10 uses 2/4 disks, 5 uses 3/4 disks)

6 = like 5, plus 1 extra disk needed (e. g. 3/5 disks)