The <a href="https://donatoroque.blogspot.com/2016/07/resized-raid-array.html">last post,</a> I was talking about resizing a component of my existing RAID. I was worried about losing data.
Here's how I did it without data loss.
/dev/md0 /dev/sdb1 2TB
I am increasing the size of the partition and it's an important distinction because the order of the steps would be different otherwise. Check the status of the RAID array with:
Put a fail flag on the partition and remove it.
$sudo mdadm /dev/md0 -fail /dev/sdb1 --remove /dev/sdb1
Then we have to use fdisk to handle the physical resizing of the device. fdisk is an interactive application in text mode. So-
$sudo fdisk /dev/sdb1
-h for help
-p for primary partition
-n new partition
if unsure choose the default option.
-q to quit without saving
-w to write the changes, now think first before hitting enter here
I used fdisk to create a new partition utilizing the entire 2TB device. I made an additional step here to check the filesystem after I created a new partition. Use fsck to verify the integrity of the ext3/ext4 filesystem. You should make sure to unmount the partition before checking with e2fsck. It will offer to fix errors you have to press consent or y for the process to continue, otherwise, use the -p switch to allow e2fsck to automatically repair the filesystem without human or administrator intervention.
$sudo e2fsck /dev/sdb1
Re-add the partition to the RAID array.
$sudo mdadm -a /dev/md0 /dev/sdb1
I had to wait 2 hours for the RAID to synchronize and then proceed to the next partition or the next step. Check the status of the synchronization with:
Do this steps one partition at a time.
Increase the size of the array with:
$sudo mdadm --grow /dev/md0 -z max
$sudo mdadm --grow /dev/md0 -z [size]
Increase the size of the ext3/ext4 filesystem with:
$sudo resize2fs /dev/md0 [size]
If the size is not specified, the default is the size of the partition.
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