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<p>Is it being rebuilt, causing higher IO?:</p>
<p>http://serendipity.ruwenzori.net/index.php/2007/08/06/mdadm-rebuild20-event-detected-on-md-device</p>
<p>Or could you have replaced a drive at some point and had an alignment mis-match?</p>
<p>If they seem "healthy" to mdadm, I would go with the suggestions to check the smart counters on the drives as others have suggested.</p>
<p>This document might be a bit old, but might give you some places to look as well:</p>
<p>http://tldp.org/HOWTO/Software-RAID-HOWTO-6.html</p>
<p>Kelly</p>
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<div class="message_header"><span>Thu Jul 14 2016 03:37:58 PM CDT</span> <span>from "gregrwm" <tclug1@whitleymott.net> </span> <span class="message_subject">Subject: Re: [tclug-list] raid corrupted? but no clue from mdstat</span></div>
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<div dir="ltr">the first report had numbers for all devices, the second and third for sda&sdb only, and the 4th and onward are all zeros. which is probably just right for a quiescent box. but mdadm still has the CPU pinned.<br />
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<div class="gmail_quote">On Thu, Jul 14, 2016 at 12:46 PM, kelly <span dir="ltr"><<a href="https://mce_host/display_enter?force_room=_MAIL_?recp=kelly.black@penguinpackets.com" target="_blank">kelly.black@penguinpackets.com</a>></span> wrote:<br />
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<p>Does iostat give any clues as to which drive is busy (i.e. more busy than the others as far as % usage?)</p>
<p>iostat -d -x 1</p>
<p>Is the LVM ok otherwise?</p>
<p>Kelly</p>
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<div><span>Thu Jul 14 2016 12:32:24 PM CDT</span> <span>from "gregrwm" <<a href="https://mce_host/display_enter?force_room=_MAIL_?recp=tclug1@whitleymott.net" target="_blank">tclug1@whitleymott.net</a>> </span> <span>Subject: [tclug-list] raid corrupted? but no clue from mdstat</span></div>
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<div><span><span style="font-size: x-small;"><span style="font-family: verdana,sans-serif;">what's up with my mdadm? note how it's taking 97% of CPU:</span></span></span><span style="font-family: monospace,monospace;"><span style="font-size: xx-small;"><br />....</span></span></div>
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