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→How to Add New Drives to An Existing Raid5
#*<blockquote>su -</blockquote>
#*<blockquote>fdisk -l</blockquote>
#*What you are looking for is probably going to be something like /dev/sd**some letter**. In my case, since I installed Fedora on one hard drive first before installing my 3 other disks RAID disks, the above command returns that I have disks labelled /dev/sda /dev/sdb /dev/sdc and /dev/sdd. I, of course, won't be using the hard drive on which I installed Fedora (/dev/sda), so my array will be created using the /dev/sdb /dev/sdc and /dev/sdd disks.
#Unmount the partitions:
#*<blockquote>umount /dev/sdb</blockquote>
#*This also can take a really long time, as well, but not nearly as long as creating the array itself.
#Unfortunately, Linux does not automatically remember your RAID settings, so you need to create a configuration file so that Linux knows that to do. Fortunately, you don't need to know (or type) the specifics, which mainly involves a really long alpha-numeric ID string:
#*<blockquote>mdadm --detail --scan --verbose > /etc/mdadm.conf</blockquote>
#Now, move all your shares to the RAID array:
#*<blockquote>mv /var/hda/files/* /dev/md0</blockquote>
#Unmount Create a mount point for the arrayArray:#*<blockquote>umount mkdir /devmnt/md0raid</blockquote>
#Edit the /etc/fstab file, so that the shares get mounted to the array on startup:
#*<blockquote>nano /etc/fstab</blockquote>
#*Edit the line containing '/var/hda/files' to read '/dev/md0 /var/hda/files ext4 defaults 1 2'.
#*NOTE: If you do not see the above then place the below on a new line:
#**<blockquote>/dev/md0 /mnt/raid ext4 defaults 1 2</blockquote>
#**If you used a different filesystem other than ext4, place that filesystem name in place of the 'ext4' above.
#Now, finally, mount your array:
That is it! Enjoy your new large storage array!
= How to Add New Drives to An Existing Raid5 =
As i I had to find out , adding a drive to a Raid5 RAID 5 is easy.
Adding the drive to the RaidRAID
mdadm --add /dev/md# /dev/sd# (# is the number of the drive you adding)
Growing The RaidRAID
mdadm --grow --raid-devices=# /dev/md$
(# is the total number of the drives in the array and $ is the raid array RAID)
Now we let the Raid array RAID rebuild and we can watch it reshape by Typingtyping:
watch cat /proc/mdstat
It will take a couple hours for the drive to reshape (PLEASE do not reboot the machine during the reshaping process)
After the reshape finished successfully , we need to make sure that the mdadm.conf has the correct drive number in it.
nano /etc/mdadm.conf
Mdadm.conf written out by anaconda
MAILADDR root
ARRAY /dev/md0 level=raid5 num-devices=10 XX UUID=4cc02637:e3832bed:bfe78010:bc810f(where num-devices= XX needs to be changed to the actual number of drives you have in the array)
Save and close nano: [ctrl+x]
Reboot the machine after the reshape has finished and you made the changes to make sure the machine boots correctly
