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How to replace a drive on a Synology NAS with Synology Hybrid RAID (SHR) on DiskStation Manager (DSM) 6.2

We will in this article show how you can easily replace a drive on a Synology NAS with Synology Hybrid RAID (SHR) on DiskStation Manager (DSM) 6.2.


Introduction

We have based our article on the six bay DiskStation DS620slim which has been set up with Synology Hybrid RAID (SHR) with two-drive fail over. On this NAS, Drive 5, is only using a 512 GB disk, while the other five drives use 1 TB disks. Our goal is to replace Drive 5 with a 1 TB disk.

Log in to DiskStation Manager (DSM) 6.2 by typing in your username and password, followed by the Sign In button.

Synology DSM 6.2 Replace Drive - Image 1


Launching Storage Manager

Once you are logged in to the desktop, open the Main menu

Synology DSM 6.2 Replace Drive - Image 2

… to launch Storage Manager.

Synology DSM 6.2 Replace Drive - Image 3

On the Overview page of Storage Manager, select the HDD/SSD button in the left-hand side column.

Synology DSM 6.2 Replace Drive - Image 4

As a first step, make sure to select the drive that you want to replace (Drive 5 in our example) and then press the Action button.

Synology DSM 6.2 Replace Drive - Image 5


Deactivating the Drive

From the Action menu, select the Deactivate menu option.

Synology DSM 6.2 Replace Drive - Image 6

You will now be asked to confirm if you want to remove the selected drive from the associated storage pool.

Tick the checkbox once you have double checked that the drive number is correct.

Press OK to continue.

Synology DSM 6.2 Replace Drive - Image 7

You will then be asked to enter your administrator’s password.

Press the Submit button to remove the drive.

There is no going back now!

Synology DSM 6.2 Replace Drive - Image 8

You will see confirmation that the selected drive has been deactivated (removed) from the system.

Press OK to close the window.

Synology DSM 6.2 Replace Drive - Image 9

Back on the HDD/SDD page you should see that the Allocation status of Drive 5 says Deactivated.

You will also start to hear a short beep from your Synology NAS at regular intervals.

Synology DSM 6.2 Replace Drive - Image 10


Replacing the Drive

You can now remove the drive from your Synology NAS. If your unit supports hot-swapping, you can simply pull out the drive while the system is running. On the other hand, if your NAS does not support hot-swapping, then you will need to power it down first.

Please read the manual for your specific NAS model so that you do not accidentally corrupt the RAID!

Synology DSM 6.2 Replace Drive - Image 11

Apologies for the inaccurate stock-photo representation which shows Drive 1 being pulled out, when it is in fact Drive 5 that we are replacing in this tutorial! :)

You will notice that Drive 5 is now missing from the HDD/SDD page.

Synology DSM 6.2 Replace Drive - Image 12

You will also see several warnings that your storage pool has been degraded.

Synology DSM 6.2 Replace Drive - Image 13

Do not worry about the warnings, as we will now insert our new drive into the NAS.

Synology DSM 6.2 Replace Drive - Image 14


Repairing the Storage Pool

Once you have added the new drive, Drive 5 will show up as Not Initialized on the HDD/SSD page.

Press the Storage Pool button in the left-hand column.

Synology DSM 6.2 Replace Drive - Image 15

On the Storage Pool page, press Action > Repair.

Synology DSM 6.2 Replace Drive - Image 16

Select your newly added drive by ticking the appropriate checkbox and then press Next to continue.

Synology DSM 6.2 Replace Drive - Image 17

You will receive a warning that all the data on the newly added drive will be erased.

Press OK to continue.

Synology DSM 6.2 Replace Drive - Image 18

You will see a final confirmation page.

Press Apply to repair (and format) the drive.

Synology DSM 6.2 Replace Drive - Image 19

The confirmation window will close and bring you back to the Storage Pool page where you can see that it is in the process of repairing itself. Drive 5 has also shown up in the Drive Info table, but has not yet been Initialized.

Synology DSM 6.2 Replace Drive - Image 20

After a short while the Storage Pool Status will change to Repairing (Checking parity consistency %).

Synology DSM 6.2 Replace Drive - Image 21

This is the time when you might want to call it a day, because the repair process will take a very long time. The percentage counter will also restart from 0% for each additional drive that you have in the storage pool, so you can easily imagine how many hours (or days) this will take.

Please note that you can continue to use the NAS while the storage pool is in the process of being repaired, but that you will experience a substantial performance hit.

Synology DSM 6.2 Replace Drive - Image 22

We are going to bed anyway. See you in the morning! :)


Expanding the Volume

Fast-forward to the next morning, we finally see the notification that we have been waiting for:

“System successfully repaired [Storage Pool 1] with disk [Drive 5]."

Synology DSM 6.2 Replace Drive - Image 23

Our work is, however, not yet done. On the Storage Pool page, if we compare Used capacity (3.17 TB) versus Total capacity (3.62 TB), we can see that the numbers are not identical. This is because even though the drive has been added to the storage pool, we have not yet configured the Volume to use up this extra space. We will do that now.

Select the Volume button in the left-hand side column.

Synology DSM 6.2 Replace Drive - Image 24

On the Volume page, press Action > Configure.

Synology DSM 6.2 Replace Drive - Image 25

Select your new allocated size. We will just press the Max button to use all available space for this Volume.

Press OK to start the expansion process.

Synology DSM 6.2 Replace Drive - Image 26

The confirmation window will close and bring you back to the Volume page where you can see that the Status column now shows Expanding (Allocating space).

Synology DSM 6.2 Replace Drive - Image 27

You should receive the following notification in a couple of minutes:

“System successfully expanded [Volume 1]."

Synology DSM 6.2 Replace Drive - Image 28

If we now go back to the Storage Pool page, we can see that Total capacity matches Used capacity.

Great, our Volume has successfully been expanded.

Synology DSM 6.2 Replace Drive - Image 29

That is it! We have successfully replaced and expanded our new drive on the Synology NAS.

Synology DSM 6.2 Replace Drive - Image 30

All that remains now is to confirm is that our System is healthy.


Summary

This article has shown how you can easily replace a drive on a Synology NAS with Synology Hybrid RAID (SHR) on DiskStation Manager (DSM) 6.2.


References

Synology.com
https://www.synology.com/

DiskStation DS620slim
https://www.synology.com/en-uk/products/DS620slim

Synology Hybrid RAID (SHR)
https://kb.synology.com/en-global/DSM/tutorial/What_is_Synology_Hybrid_RAID_SHR

DiskStation Manager (DSM) 6.2
https://www.synology.com/en-uk/dsm/6.2

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