https://devopsnotebook.com/index.php?action=history&feed=atom&title=Linux_software_RAID 2026-04-23T17:46:57Z Revision history for this page on the wiki MediaWiki 1.33.1 https://devopsnotebook.com/index.php?title=Linux_software_RAID&diff=213&oldid=prev 2020-09-27T11:21:38Z

<p>Created page with &quot;== Replace failing drive in software raid 1 == Check which drive is failing &lt;pre&gt; # cat /proc/mdstat Personalities : [raid1] md3 : active raid1 sda4[0] 1822442815 block...&quot;</p> <p><b>New page</b></p><div>== Replace failing drive in software raid 1 ==<br /> Check which drive is failing <br /> &lt;pre&gt;<br /> # cat /proc/mdstat<br /> Personalities : [raid1]<br /> md3 : active raid1 sda4[0]<br /> 1822442815 blocks super 1.2 [2/1] [U_]<br /> <br /> md2 : active raid1 sda3[0]<br /> 1073740664 blocks super 1.2 [2/1] [U_]<br /> <br /> md1 : active raid1 sda2[0]<br /> 524276 blocks super 1.2 [2/1] [U_]<br /> <br /> md0 : active raid1 sda1[0]<br /> 33553336 blocks super 1.2 [2/1] [U_]<br /> <br /> unused devices: &lt;none&gt;<br /> &lt;/pre&gt;<br /> Remove drive:<br /> &lt;pre&gt;<br /> # mdadm /dev/md0 -r /dev/sdb1<br /> # mdadm /dev/md1 -r /dev/sdb2<br /> # mdadm /dev/md2 -r /dev/sdb3<br /> # mdadm /dev/md3 -r /dev/sdb4<br /> &lt;/pre&gt;<br /> <br /> Backup mbr/gpt table<br /> MBR: <br /> &lt;pre&gt;<br /> # sfdisk --dump /dev/sda &gt; sda_parttable_mbr.bak<br /> &lt;/pre&gt;<br /> GPT: <br /> &lt;pre&gt;<br /> # sgdisk --backup=sda_parttable_gpt.bak /dev/sda<br /> &lt;/pre&gt;<br /> <br /> Restore mbr/gpt table<br /> MBR:<br /> &lt;pre&gt;<br /> # sfdisk /dev/sdb &lt; sda_parttable_mbr.bak<br /> &lt;/pre&gt;<br /> GPT:<br /> &lt;pre&gt;<br /> # sgdisk --load-backup=sda_parttable_gpt.bak /dev/sdb<br /> &lt;/pre&gt;<br /> <br /> Add new partitions to raid<br /> &lt;pre&gt;<br /> # mdadm /dev/md0 -a /dev/sdb1<br /> # mdadm /dev/md1 -a /dev/sdb2<br /> # mdadm /dev/md2 -a /dev/sdb3<br /> # mdadm /dev/md3 -a /dev/sdb4<br /> &lt;/pre&gt;<br /> <br /> Check if its rebuilding<br /> &lt;pre&gt;<br /> # cat /proc/mdstat<br /> Personalities : [raid1]<br /> md3 : active raid1 sdb4[1] sda4[0]<br /> 1028096 blocks [2/2] [UU]<br /> [==========&gt;..........] resync = 50.0% (514048/1028096) finish=97.3min speed=65787K/sec<br /> <br /> md2 : active raid1 sdb3[1] sda3[0]<br /> 208768 blocks [2/2] [UU]<br /> <br /> md1 : active raid1 sdb2[1] sda2[0]<br /> 2104448 blocks [2/2] [UU]<br /> <br /> md0 : active raid1 sdb1[1] sda1[0]<br /> 208768 blocks [2/2] [UU]<br /> <br /> unused devices: &lt;none&gt;<br /> &lt;/pre&gt;<br /> <br /> Install bootloader on new drive<br /> &lt;pre&gt;<br /> # grub-mkdevicemap -n<br /> # grub-install /dev/sdb<br /> &lt;/pre&gt;</div>

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