Differences

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--- raid [2011/03/07 10:59] – [create:] paulsmith
+++ raid [2022/01/31 21:11] (current) – [Rebuild array with replaced disk] paulsmith
@@ Line 38: / Line 38: @@
 ===== Take a disk offline =====
 <code>
 </code>
+===== Build a raid from scratch =====
+<code>
+modprobe raid5
+#  mknod /dev/md0 b 9 0   <- not sure needed now, mdadm might create it
+fdisk /dev/sdb   g enter, n enter 1 enter enter enter, t raid, w enter
+fdisk /dev/sdc   g enter, n enter 1 enter enter enter, t raid, w enter
+fdisk /dev/sdd   g enter, n enter 1 enter enter enter, t raid, w enter
+mdadm --create --level=5 --chunk=64 --raid-devices=4 /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
+</code>
 ===== Rebuild array with replaced disk =====
@@ Line 45: / Line 65: @@
 <code>
+mdadm /dev/md0 --fail /dev/sdb1 --remove /dev/sdb1 --add /dev/sdf1
+--- Add as hot spare, then replace/with, then remove failed
+mdadm /dev/md0 --add /dev/sdb1
+mdadm /dev/md0 --detail
+mdadm /dev/md0 --replace /dev/sdf1 --with /dev/sdb1
+mdadm /dev/md0 --remove /dev/sdf1
+mdadm --detail --scan > /etc/mdadm/mdadm.conf
+update-initramfs
 </code>