I have a Synology that has only one 2TB harddrive using SHR raid type mainly for surveillance camera recording. It started running out of space and I wanted to upgrade it to a 3TB harddrive but want to reuse the original 2TB drive for other use case. So I used a drive clone tool to clone all the partition of the old 2TB to the new 3TB drive. But I noticed in the Synology Storage Manager, it is still saying the storage pool only has 2TB and can’t be expanded or create a new storage pool even though the HDD/SDD section did recognize the new drive to be 3TB.

This article will show you how to solve this problem.

Step 1: Enable SSH

Step 2: SSH into your nas with your user name and password

Step 3: run the following command

sudo -i

type in your password

Step 4: run the following command

fdisk -l

You will see a list of disk info. Find the one that matches your disk size, usually the name is /dev/sata1 something

Step 5: run the following command

parted /dev/sata1

P

Then you’ll be able to see the partitions of this drive. Look for the one that has the max size. If your old drive has 2TB, it probably will show something like 1900GB. And remember the partition No.

Step 6: Then we need to make this partition use all the remaining space. Very simple, one command can do it.

parted /dev/sdb resizepart 3 100%

Step 7: Verification

When done, run parted /dev/sata1 again to verify.

Step 8: Back to Synology

Now you should see a prompt in Storage Manager that the storage pool can be expanded.