Help with adding a new HD to a Synology NAS

Apologies if this isn’t directly Mac related, but I wasn’t sure where else to post.

I had one of the HDs in my NAS go down on me, so I’ve just bought a new one to replace it. However, the new one has been added to a second storage pool on its own whereas Storage Pool 1 is still listed as degraded.

Is that right? I was trying to add the new HD to the original storage pool to ensure proper back up of data. Will that still happen if the new hHD is in a totally different pool?

Thanks a lot in advance

Hopefully you have RAID running on the machine?

I just replaced a disk in my Synology DS420j with RAID5 and one Volume. I’ve forgotten more than I ever knew about Unix/Linux servers (which Synology NAS is), frankly. I followed the instructions at Replace a Drive | DSM - Synology Knowledge Center

Basically, as I recall, I used Storage Manager to tell me which disk was bad, shutdown the unit, then replaced that disk. It was a 4TB and I inserted a 6TB. Now have three 6TB and one 4TB. Restarted, and then via Storage Manager watched the box take care of all the details of integrating the new drive into itself. Benefits of RAID5, I guess.

Your mileage may vary, of course.

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Take my answer with a grain of salt. I am not 100% sure. It is difficult to be 100% sure what is going on on your NAS without knowing its setup (RAID configuration and so on).

It sounds to me as if you inadvertently have created a second storage pool. I am not 100% sure about that but I think that a second storage pool is completely independent from the first one. Drives in the second storage pool will not be of any use in the first one.

What would I do?

  1. Make sure that you really do not have any data on storage pool 2. (!!!)

  2. Delete Storage Pool 2. Create a Storage Pool | DSM - Synology Knowledge Center - there is a chapter that describes the process of deleting a storage pool (“Remove a Storage Pool”).

  3. Replace the drive following the instructions @rms has referred to above.


Thanks both - the help is much appreciated!