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I had a similard behaviour due to upgrade from Jessie 8.0 to 8.5
straight ? <br>
<br>
Only my /home is a RAID , I booted without the /home , then could
assemble manualy ,ie "madam -A -scan " then run.<br>
<br>
According to
<a class="moz-txt-link-rfc2396E" href="https://superuser.com/questions/287462/how-can-i-make-mdadm-auto-assemble-raid-after-each-boot">"https://superuser.com/questions/287462/how-can-i-make-mdadm-auto-assemble-raid-after-each-boot"</a><br>
<br>
I edited the <b><code>/etc/init.d/mdadm-raid</code></b> file and
inserted the line
<p><b><code>partprobe</code></b></p>
<p>after the header<br>
</p>
<p><code>/etc/init.d/mdadm-raid belongs to mdadm 3.4-1 </code><b><code><br>
</code></b></p>
<p>In the old days, we split the swap-space on the beginning of each
disk. So my raid is still built with a partition sdx2 instead of
whole disk sdx. So i still need partprobe at that place. <br>
</p>
<p>I can't tell if the bug arise from new udev or systemd. <br>
</p>
<p>Fixed for me<br>
</p>
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