RAID: Added 1 x 2TB Hard drive

I talked about RAID in my system before here and here. My present set up is:

/dev/sda5 SSD 223GB EXT4 /

/dev/sdb1 HHD 2TB Linux raid /media/user

/dev/sdc1 HHD 1TB Linux raid /media/user

New:

/dev/sdd1 HHD 2TB unpartitioned - free space

RAID:

/dev/md0 2 devices /dev/sdb1 /dev/sdc1

/dev/sdc1 is old. It has 27,500 hours of use according to smartctl. You can open the terminal and type:

#smartctl -a /dev/sdc

to get collected data from the device. Among other attributes see Power-on-hours to get the total hours this hard drive has been spinning. Also pay attention to 5 Attribute the allocated Sector Count. Any value you see other than 100 there, you should move your data somewhere else.

I have a RAID5 which includes this device. So any warning notification I can fail and remove it. Replace it with a new hard drive. I am completing my RAID 5 array with a new hard drive today.

After installing the hard drive to your SATA cable and power cable. See if your computer detects it. Type:

#fdisk -l

Then partition the disk with fdisk.

#fdisk /dev/sdd

fdisk will create a new partition and create a partition table for you.

-d delete partition

-n create new partition

-p print new partition and details

-t change to new type of filesystem

-l list filesystem type

-q quit without saving

-w write changes, and think first before typing enter

Once the new partition in the new hard drive is ready. I added the device to the RAID array.

Old RAID:

/dev/md0 2 devices /dev/sdb1 /dev/sdc1

To add the new device to the RAID array:

#mdadm -add /dev/md0 /dev/sdd1

Check the status of the array:

#cat /proc/mdstat

It will show that /dev/sdd1 is a spare. I have to grow the array to 3 devices.

#mdadm --grow --raid-devices=3 /dev/md0

You can monitor the sync process of the array with:

#cat /proc/mdstat

Donato Roque @ubuntu-16.04

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