<div class="bbWrapper">Wow, you are using a VERY old release of FreeNAS, 8.0! Can you upgrade? The latest stable release is 8.0.4-p3<br />
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<a href="http://sourceforge.net/projects/freenas/files/FreeNAS-8.0.4/" target="_blank" class="link link--external" rel="nofollow ugc noopener">http://sourceforge.net/projects/freenas/files/FreeNAS-8.0.4/</a><br />
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I would guess that one of your disks is failing. Are you using UFS or ZFS? What is your hardware configuration?</div>