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Marc ChevalierFlag for United States of America

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How do I migrate hard drives from DS414J to new DS420J and format drives while doing so

Hi, I have a Synology DS414J that has 3 8Tb drives in it with corrupted data. I want to buy a new DS420J and move the 3 8Tb drives with data on them to the new DS420J and set it up as a brand new NAS. I want one single volume on it and use it only for Time Machine Backup. Also during the process I want to make sure that the 3 8Tb hard drives get erased so I will start clean with empty drives. Can someone please give me the steps in order to do this process?  Thank you. Also I want to set it up as SHR Raid and this NAS will be connected to my Apple iMac.
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Hardware installation here: 

Setting up the drives, RAID type and volumes are described here: 

Creating a new storage pool will always erase the drives. If for some unforeseen reason the system starts with your old storage pool and volumes (which for some people is actually a blessing, having their data ready in a new system), just delete the volumes, then delete the storage pool. Then start anew according to the above steps.

What is the point of getting a new enclosure and move the drives?
the DS414J is about six years old. The dries within presumably are of the same vintage.
corrupted data because of ?

much depends on how much space you need.
IF you are getting a new one with larger drives, you could use the new as the primary backup of your Mac while the second can be the backup for the new nas..
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Thanks Kimputer, again. Could you answer this please. Tomorrow, I have decided to wipe out my existing 3 8Tb drives on my DS414J because the data is corrupted and then just start over on the same DS414J with clean drives. If I were to delete the existing volume pool and then the storage pool, would I be able to start fresh like that?  Once I delete the volume and pool, will the unit want to reinitialize the drives?  Not sure how to go about this. Thanks you again.
You can move the drives, synology has a reset option. Once you login into the interface you can reinitialize the drives in the new unit or initialize them on the old one and bring them over.
Thanks Arnold. I am asking about just keeping the drives in the existing enclosure but re-formatting them to remove the corrupted data. Then I would have all 3 drives clean again to use in the same existing box. Should I reset the Synology? I’m not sure what to do to reformat the drives but keep the setup in tact. Thanks
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Hi all and thank you for your information. I think I need to back up a bit and explain this situation in more detail.
I have had a DS414J for about two years with 2 - 6tb drives installed in it using SHR raid and it was setup strictly for Time Machine backup using AFP. It is on the same network as my 2019 5K i5 iMac. Everything ran fine with computer and time machine backups until about a month ago. I started getting messages that the backups were not completing. Then I noticed that I had no backups showing when I entered Time Machine. Then I started to get messages that I would need to start time machine over again to make a new set of backups. I was almost out of disk space on the DS414J at that point. I purchased 3 brand new WD Red NAS drives, 8tb each and installed each one into the DS414J at a time using the recommended Synology expansion process. Once they were all loaded, Time Machine would still not work correctly. I assumed all the data had been somehow corrupted on the NAS and so I wanted just a clean start with the 3 brand new drives. Now I used the Reset process on DSM to reset the unit and erase all data.  Once that finished I setup the DS414J again for Time Machine backup and did the first new time machine backup. It took about 6 hours and was 525Gb in size. Ok so now that you have the history, this is what I am concerned about. After this initial backup, DSM showed 525Gb out of 14.7Tb used. Then it started a parity check process and this was this last Monday about 11pm. The parity check process is still running with about 28% completed but the troubling part is now my storage is up to 2.2tb used?  If my backup took only 525gb, why in only 2 days would my used space be up to 2.2tb?  Does the parity check process use of storage space while it is running?  I have entered time machine and my backups all look right since the initial one on Monday. I don’t know if I still have an issue or if I just don’t fully understand the process. Any information on this would be helpful. Thank you.

I don’t know if this matters or not but my iMac came with Mojave 10.14 on it and about 2-4 weeks before I started having issues with Time Machine, I upgraded to Catalina. Just thought you might want to know this.
is your timemachine still backing up on a schedule?

access teh DSM interface and see what it is reporting. what is the configuration of the volume? raid5 ?
Yes, Time Machine is still backing up on its own schedule and I can see all the backups since Monday when I enter Time Machine backups.

The DSM shows the storage pool and volume is healthy but also show the parity check is running. It also shows that the disk usage has risen since Monday. It was 525Gb on Monday. I attached screen prints from today. Thank you.
if you have 4 time machine backup at 525gb each, that could explain your 2.2TB ...
Based on what you described in your last long comment.

1) The problem of seeing smaller disk size than actual disk size is old electronics that pre-date new large drives.

I hit this at one point with an enclosure.

Seems like the max size was 4Tb (or maybe 6Tb), so any disk larger showed up as something like 5%-10% of disk.

2) The small disk size + odd behavior strongly suggests upgrading to a new enclosure.

Likely problems will resolve + you can go all the way up to the dirt cheap 18Tb EXOS drives.