Which is better for virtualization, RAID5 or Single drive?

Posted on 2012-09-19
Medium Priority
Last Modified: 2012-09-23
I have 3 VMs (on ProxMox).  Will I get better IO performance putting all 3 on a hardware RAID5 array or using a single drive for each VM?  I am using SATA drives not SAS.
Question by:pdering
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Accepted Solution

Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 38416583
More Drives = More Spindles = More Performance = More IOPS.

Combining and striping across 3 drives, should perform better than a single drive.

See this post for an explaination about IOPs.


SATA: 70-90 IOPs per disk.
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Expert Comment

by:Ayman Bakr
ID: 38416856
Moreover, RAID 5 will provide you with more reliability as fault tolerance is depicted with distributed parity check.

If you can provide for 4+ disks you can have high reliability with high performance using RAID 10, 50 or 0+1. RAID 50 will require at least 6 drives but has high I/O rates and data transfer performance.

For more information on RAIDs see this link:


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