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How to configure a RAID 5

Posted on 2006-04-29
Medium Priority
Last Modified: 2010-04-03
I am trying to configure 3 SCSI drives on a Poweredge 4300 to be RAID 5.

I have a PERC SCSI Controller. I have updated the firmware.

I go into the PERC BIOS and configure a NEW CONFIGURATION.

I then select each of the 3 SCSI drives which are 8GB each.

I then press enter to END the ARRAY.

I then see that the size of the logical drive is only 16BG.

Why is is only 16BG and not 24BG? ( 3*8 = 24 and 2*8 = 16)

Question by:mancoi
  • 3
LVL 97

Expert Comment

by:Lee W, MVP
ID: 16569671
Because RAID 5 uses one disk worth of space for parity information.

You will only get (Drives) x (smallest disk size) - (smallest disk size) space available when using RAID 5.
LVL 97

Accepted Solution

Lee W, MVP earned 2000 total points
ID: 16569673
So if you had 10x8GB drives you would have 9x8GB space available.
LVL 97

Expert Comment

by:Lee W, MVP
ID: 16569681

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