Array

Creating a RAID array on the HDDs of a server

Here’s a quick-step post on creating a RAID array on the HDDs of a server.
Steps posted here are for an HP(E) server but can be applied to other vendor’s make/model as well.

  1. Boot up the server and press *F8 [HP Servers] to configure array (either entering Array Configuration Utility [ACU] or Smart Storage Administrator (SSA) as the case maybe depending on the generation of the server).
    *Press F8 once the iLO configuration prompt clears, else you will enter into the iLO configuration screen instead of array configuration.
  2. Alternatively, you can create a RAID array by pressing F10 (for Gen8 and above) and entering the HPE IP (Intelligent Provisioning). Once you are on the IP page, select “Perform Maintenance” > “HPE SSA”.
  3. Remember just how many disk failures different RAID levels can sustain as well as the amount of data reserved (parity) and the amount of data you can get for use.
    a. RAID 1 can sustain just 1 disk failure
    b. RAID 5 similar to RAID 1 can sustain 1 disk failure (N+1)
    c. RAID 6 can sustain 2 disks failure (N+2)
    d. RAID 1+0 can sustain multiple disk failures provided the both disks are not in the same mirror.
  4. RAID level or type depends on the RAID/Array Controller installed on the server.
    Not all Array Controllers are capable of providing all the different levels/types of RAID.

For more on different levels of RAID, refer the below links:

  1. http://www.thegeekstuff.com/2010/08/raid-levels-tutorial/
  2. http://www.thegeekstuff.com/2011/10/raid10-vs-raid01/
  3. http://www.raid-calculator.com/raid-types-reference.aspx
  4. blog.servercentral.com/the-levels-of-raid
  5. https://serverfault.com/questions/300846/which-raid-solutions-can-handle-2-disk-failures