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--- linux:centos:software-raid1-setup [2020/04/22 20:58] – [Replace a failed hard disk in raid setup] odefta
+++ linux:centos:software-raid1-setup [2025/01/02 20:22] (current) – external edit 127.0.0.1
@@ Line 111: / Line 111: @@
 Suppose the /dev/sdb hard disk failed. \\
-To replace it with a good hdd, set it as failed and remove it from raid array:
+To replace it with a good hdd, set it as failed and remove it from the array:
 <code>
 mdadm /dev/md0 --fail /dev/sdb --remove /dev/sdb
@@ Line 118: / Line 118: @@
 Add the new device to the array:
 <code>
-mdadm --add /dev/md0 /dev/sdb1
+mdadm --add /dev/md0 /dev/sdb
 </code>
+==== Re-add a good hard disk (after cable disconnection for example) ====
+After reinserting the hard disk, it may be mounted now on a different device letter.\\ Ckeck it by running:
+<code>
+fdisk -l
+</code>
+Output:
+<code>
+...
+Disk /dev/sdd: 4000.8 GB, 4000787029504 bytes, 7814037167 sectors
+Units = sectors of 1 * 512 = 512 bytes
+Sector size (logical/physical): 512 bytes / 4096 bytes
+I/O size (minimum/optimal): 4096 bytes / 4096 bytes
+</code>
+After identifying it, re-add it to the raid array with:
+<code>
+mdadm --manage /dev/md0 --add /dev/sdd
+</code>