troubleshooting Question

Understanding why Dell pre-configured RAID 10 has one large disk group but 5 logical drives?

Avatar of CnicNV
CnicNV asked on
Server HardwareStorageDellRAID
8 Comments1 Solution684 ViewsLast Modified:
Hello :)

I have a Dell PowerEdge R530 with PERC H730 RAID controller which contains 8 physical 1.88TB 7200RPM SATA drives.  I asked Dell to preload it with RAID10, which they did.

My expectation of RAID 10 with my physical capacity would manifest with 14.4 TB of physical storage, but with 7.2 usable and one equally large logical volume using that space.  IE RAID 10 is two nested RAID 1's each sub array with 4 physical drives total, inside a larger RAID 0 spanning the two pairs of logical RAID 1 drives all together.

So what I actually see in the pre configured Dell RAID 10 are 5 virtual disks.  4 Virtual disks are 1.8TB and the 5th is a 77GB.  So two questions...

1.  Are Dell "Virtual" drives the same as RAID logical drives, IE the 4 nested RAID 1 A,B,C and D drives spanned RAID 0?  If so, I am guessing there is no way to present these 4 drives as 1 larger 8 TB logical drive like you would be able to with RAID 5?

2. Also, what is the purpose of the 5th 77GB virtual drive?

Thanks for the info.
ASKER CERTIFIED SOLUTION
PowerEdgeTech
IT Consultant

Our community of experts have been thoroughly vetted for their expertise and industry experience.

Top Expert 2010

The Distinguished Expert awards are presented to the top veteran and rookie experts to earn the most points in the top 50 topics.

Join our community to see this answer!
Unlock 1 Answer and 8 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 8 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros