• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 337
  • Last Modified:

Raid5 problem

I have 3 physical drives with Raid5 setup, two drives are 74gb, and one is 9gb, however, after installing the Win2k I get only 16GB on a C drive, and I dont see other space available at all.  I have only one array A created and wont allow me to create array B.  How would I create an arrayB?  I want C and D drive, but I am unable to allocate space for D drive.  Windows allowed me only to use 17gb upon installation.  Where did the other drives go ? and how can I use them for a D drive?

Thanks in advance.
1 Solution
Lee W, MVPTechnology and Business Process AdvisorCommented:
A RAID 5 volume will be equal to the size of the smallest disk multiplied by the number of disks and subtract the size of the smallest disk.  So in this case, 9 GB is your smallest disk - 9 x 3 disks - 9 (the smallest Disk) = 18 GB (in raw terms; actual size will vary because of file system overhead and the way manufacturers market the drives).

So, in short, your RAID is performing EXACTLY as expected with the disks you have.

As for how to use the other 65 GB on each drive, you would need to create another array in the RAID controller's BIOS.  How you do that depends on the RAID controller - and I HAVE seen some RAID controllers that simply do not permit multiple volumes on a disk.

I would suggest you replace the 9 GB drive with another 74 GB drive and reinstall.
Rohail2004Author Commented:
Thanks,  I will follow your advice and try to reinstall.

Appreciated... I am new in Raid stuff..

Featured Post

Get free NFR key for Veeam Availability Suite 9.5

Veeam is happy to provide a free NFR license (1 year, 2 sockets) to all certified IT Pros. The license allows for the non-production use of Veeam Availability Suite v9.5 in your home lab, without any feature limitations. It works for both VMware and Hyper-V environments

Tackle projects and never again get stuck behind a technical roadblock.
Join Now