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Performance on RAIDZ2 - Big Hardware (CPU,RAM) but slow performance with disk not really busy?

Western Digital Drives - The Preferred Drives of FreeNAS and TrueNAS CORE
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jgreco

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Is this box hosting live VM storage, or just a backup destination for vmdk files? If the latter, RAIDZ2 should be fine. If the former, striped mirrors are preferred.

Even if it's backup vmdk's, the constant write-rewrite activity for the vmdk's will tend to cause a lot of frag behaviour over time. Not anywhere near as bad as live vmdk's, but, still....
 
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