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Software raid - mdadm - Revision history
2026-07-02T09:34:53Z
Revision history for this page on the wiki
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https://wiki.skytech.dk/index.php?title=Software_raid_-_mdadm&diff=1838&oldid=prev
Martin: /* Force create a new raid array with no spared (in case of existing data from previos raid) */
2012-08-12T09:28:05Z
<p><span class="autocomment">Force create a new raid array with no spared (in case of existing data from previos raid)</span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:28, 12 August 2012</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Assuming Raid 5 using 3 drives: '''sda1''' - '''sdc1''' - '''sdd1'''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Assuming Raid 5 using 3 drives: '''sda1''' - '''sdc1''' - '''sdd1'''</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>First we overwrite the superblock</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>First we overwrite the superblock</div></td></tr>
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Martin
https://wiki.skytech.dk/index.php?title=Software_raid_-_mdadm&diff=1837&oldid=prev
Martin: Created page with "Category:Linux = Force check of a software raid = <pre> echo "check" > /sys/block/md0/md/sync_action </pre> = Force create a new raid array with no spared (in case of ex..."
2012-08-12T09:27:39Z
<p>Created page with "<a href="/index.php/Category:Linux" title="Category:Linux">Category:Linux</a> = Force check of a software raid = <pre> echo "check" > /sys/block/md0/md/sync_action </pre> = Force create a new raid array with no spared (in case of ex..."</p>
<p><b>New page</b></p><div>[[Category:Linux]]<br />
<br />
= Force check of a software raid =<br />
<pre><br />
echo "check" > /sys/block/md0/md/sync_action<br />
</pre><br />
<br />
= Force create a new raid array with no spared (in case of existing data from previos raid) =<br />
Assuming Raid 5 using 3 drives: '''sda1''' - '''sdc1''' - '''sdd1'''<br />
First we overwrite the superblock<br />
<pre><br />
mdadm --zero-superblock /dev/sd[acd]1<br />
</pre><br />
<br />
Then re-create the array using the --assume-clean<br />
<pre><br />
mdadm --create /dev/md1 --assume-clean --verbose --level=5 --raid-devices=3 /dev/sda1 /dev/sdc1 /dev/sdd1<br />
</pre><br />
<br />
Possible force-check the array if needed with the above.</div>
Martin