Add new larger disk in DS416

[javichuteck]

Hello.

I have for years my Synology DS416, with a 4TB hard disk.
Yesterday I bought a new disk, 8TB, with the intention of having a total of 12TB (discounting the space left by the system).

Since I booted Nas with the 4TB disk I have a Storage Group in Raid type: SHR with the 4TB disk.

When I try to add another volume to this Storage Group (for the 8TB disk) it tells me that the estimated capacity is 3.6TB (I am losing 4TB along the way).

How can I mount the 2 disks, having the maximum storage capacity and without losing all the information on the 4TB disk?

Thank you very much.

 

[Birdy]

Have a look here

 

[javichuteck]

I thought they were different, separate communities, so I posted the same thing on both sides.

 

[Birdy]

It's good to kwow here, what was advised already.

 

[EAZ1964]

it looks like you have been well informed on the other forum.
For your information: the 8+4 TB can be available as total in two pools, not as one 12TB. (unless you decide to go to JBOD which I strongly object, as it doubles the risk of data loss.

I also picked up from the other forum that you do not have a backup from the 4TB disk.
Your 4TB will fail some day, tomorrow or in the coming years), and all data is then lost unless you create some kind of a backup.
One single Disk in SHR is meaningless. Just one disk that will fail some day.
Not sure about a 4TB disk cost in your area, but worth considering adding 2x4TB. It gives you also 8TB of storage, with one disk redundancy. Still not a backup, but protected against one disk failure.

 

[javichuteck]

The thing is that I already have the 8Tb disk, and I didn't want to get rid of it.

So, I'm trying to understand what would be the best way to proceed.

I also got an external 5TB drive to back up my current NAS content.

So:

• 1) I'm backing up. It looks like backing up the current 3.8TB to the 5TB external hard drive is going to take several days.
• 2) When the backup is done I will be able to undo the current volume, but I am not clear on the correct file system to use (RAID 1, RAID 2, or which one).

My biggest doubt is: can I have 4TB + 8TB = 12TB as general storage and on them have backups or redundancy (logically knowing that the 12TB could be reduced to 6TB in this process)? What file format should I put then and how? Dismounting everything and mounting first the 12TB? And then the 4TB? What file format should I give when I put the 12TB?

Thanks again!

 

[EAZ1964]

You cannot use 4+8=12 TB for 2x6TB redundancy, impossible:

RAID Calculator | Synology Inc.

Use this interactive tool to estimate the storage space of your Synology NAS when paired with different size hard drives and RAID levels.

www.synology.com

The only way is to just add the 8TB as a second pool and volume.
The 4TB will stay intact, no problem.
Then, if the 4 and 8 TB live together, but as separate basic volumes, you can create new shared folders on the 8TB disk, or move shared volumes from the 4TB to the 8TB.

I do advise you to familiarize yourself with synology disk setup, eg using the knowledge base:

Create a Storage Pool | DSM - Synology Knowledge Center

Synology Knowledge Center offers comprehensive support, providing answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.

kb.synology.com

 

[Coop777]

My .02 - since you've added the 8TB drive to the SHR array, why not replace the 4 TB drive with another 8? That gives you an increase of ~4TB of formatted space...

 

[javichuteck]

Because the 8TB disk cost me 230€ and I wasn't going to spend another 230€ more. The economy is not in a position to spend that much.

I understand perfectly well what you are saying, but the economy is a factor that rules and it is what forces us to make certain decisions.

 

[Coop777]

understand completely...