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Systemd in Debian

I notice that my raid array is not starting up properly after I boot a new kernel, 4.3. I figured out that I could manually assemble the array with the command below. However, I want to automate the process.

mdadm --assemble --verbose /dev/md127 /dev/sdb1 /dev/sdc1

The solution is making the necessary changes in mdadm.conf file so that the system can see the array following a reboot. Here is my mdadm.conf file.

# Please refer to mdadm.conf(5) for information about this file.

# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
#DEVICE partitions
DEVICE /dev/sd[bcdjkl]1

# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes

# automatically tag new arrays as belonging to the local system

# instruct the monitoring daemon where to send mail alerts

# definitions of existing MD arrays
ARRAY /dev/md127 metadata=0.90 UUID=a42d6399:f6d2b49c:924717a0:72ea5865 devices=/dev/sdb1,/dev/sdc1

# This file was auto-generated on Mon, 16 Jul 2012 06:37:54 -0400
# by mkconf 3.1.4-1+8efb9d1+squeeze1

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Howto replace a bad hard drive on Software RAID

On my server, I have a drive on software raid  mirroring. This array stores all my data for this blog. A couple of weeks ago I got a degraded array message. When I try to reboot the server, I heard a clicking noise on one of the mirrored drive. These are the steps I did to replace the drive.

  1. fdisk -l
  2. fdisk partition the new hard drive
  3. add the new drive

mdadm --manage /dev/mdX --add /dev/sdX