Which is better for virtualization, RAID5 or Single drive?

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.
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
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.
Ayman BakrSenior ConsultantCommented:
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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