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--- nas:build_a_linux_nas:create_a_software_raid_array [2021/09/25 19:43] – peter
+++ nas:build_a_linux_nas:create_a_software_raid_array [2021/09/26 12:00] (current) – [Ensure the RAID Array is reassembled automatically each time the system boots] peter
@@ Line 1: / Line 1: @@
 ====== NAS - Build a Linux NAS - Create a Software RAID Array ======
+===== Check the disk partitions to be used in the RAID =====
+<code bash>
+mdadm --examine /dev/sd[b-d]1
+or
+mdadm --examine /dev/sdb1 /dev/sdc1 /dev/sdd1
+</code>
+returns:
+<code bash>
+mdadm: No md superblock detected on /dev/sdb1
+mdadm: No md superblock detected on /dev/sdc1
+mdadm: No md superblock detected on /dev/sdd1
+</code>
+<WRAP info>
+**NOTE:**  There is no any defined RAID on the sdb1, sdc1 and sdd1 drives so far, which is why no superblocks are detected.
+</WRAP>
+----
 ===== Create a Software RAID Array =====
@@ Line 8: / Line 32: @@
 or
-sudo mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 --spare-devices=1 /dev/sd{b,c,d, e}1
+sudo mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 --spare-devices=1 /dev/sd{b,c,d,e}1
 </code>
@@ Line 16: / Line 40: @@
   * This device represents the RAID 5 of /dev/sdb1, /dev/sdc1 and /dev/sdd1.
   * Obviously other RAID types could be used instead.
+If the following message is seen: **Device or resource busy**, then reboot the OS.
 </WRAP>
@@ Line 24: / Line 50: @@
 <code bash>
 sudo mdadm --detail --scan | sudo tee -a /etc/mdadm/mdadm.conf
+or
+sudo mdadm --detail --scan --verbose | sudo tee -a /etc/mdadm/mdadm.conf
 </code>
@@ Line 29: / Line 59: @@
 <code bash>
+ARRAY /dev/md/0 level=raid5 num-devices=3 metadata=1.2 spares=1 name=xenial:0 UUID=c7a2743d:f1e0d872:b2ad29cd:e2bee48c
+      devices=/dev/sdb1,/dev/sdc1,/dev/sdd1
 </code>