Adding Space with an expansion unit

Hi All!
I am nearing 80% on my RS1221+ (which syncs to a DS1817+ via Drive offsite). I am thinking of adding an expansion unit to each. My questions are around how best to execute this. I plan to move off a bunch of older photos. I think I will pause the Drive Sync on both machines and then MOVE some amount of TB’s of data over to the expansion units, and then restart Drive. Do you see any issues with this process? Does Drive have to re-sync the whole thing (80TB), or since the same data is missing on both, it won’t care. The expansions units do not need to sync since it’s older data.

I assume you use Synology Drive ShareSync (SDSS) between both NASs. I also guess that you sync from NAS A to NAS B.

I assess that when you move files on NAS A, SDSS will remove the data from NAS B (original location) and sync them again to the new location.

Hi Paul:
Thanks for your reply! So in your scenario, NAS A&B sync two directions. I plan to pause the SDSS, and then move the same folder of data off of both A&B and then resume the SDSS (about 15TB worth of stuff). Once moved, that data no longer needs to sync once it’s on the expansion units since it’s older. The remaining data will then continue syncing. I guess I am asking if this plan will work. I assume if it no longer sees a chunk of data on either A or B, then it won’t care that it’s gone. We’ll see…

I am interested in how this evolves. Please keep us posted if you will.

Hi All: I have finished the installation of the two expansion units on my main NAS units (one in my house and one in my associate’s house). Adding the expansion units is super easy. Setup in DSM in nothing really for the units themselves, it sees it and that’s it. The main units are at about 100TB each in one Volume so I made new Volumes on the expansion units about 15TB each. I paused the Drive Sync (2 way sync) and then began moving folders from the Vol 1 to Vol 2 on each NAS with the MOVE command. Goes pretty quickly and I did this off and on over about 3 days since I need to turn syncing back on periodically. Drive didn’t care a bit since the data was now missing on both NAS units. I am not needing to the sync the expansion units, this is pretty cold storage.

I also run a separate DS1817+ as my Hyper Backup vault. It backs up the NAS in my house each night. For this I just asked it to add the shared folder on Volume 2 to its backup task and it did it just fine. And it removed all the data from Vol 1 that was moved to Vol 2. That was easy, just one check box, and then a bunch of monitoring to make sure it was working.

The only thing I cannot figure out is that I have not yet regained the space on Vol 1. Maybe about 2TB, but it should be 15TB. I looked in the Recycle bin and those folders are not residing in both Vol 1 and Vol 2. So I am not sure how to regain that space. Perhaps Snapshots has something to do with it? Or maybe I have to wait for Space Reclaimation to run? It’s been about a week since it completed the move. Any ideas? Otherwise it worked well, so far…

You already mentioned snapshots if you use them. And versioning of Synology Drive is certainly something to check out.

It’s almost certainly snapshots of the old files on volume 1. Go into snapshot replication and checkout the schedule of whatever shared folders you moved files out of. The should auto expire after 30 days (what I normally would setup for you). You can speed this along by removing old snapshots under ‘list’

Thanks Will! That was it! I removed a bunch on the main unit and I will see if time removes them on the remote unit. Both expansion units working well so far.