Hello all!

 

I actually have a DS-918+ with 4 12TB HDD inside (14TB used).

I want to migrate to my Unraid Tower, and to sell my 918+.

 

I don't have money to buy 4 new HDD, but I will buy an extra 12TB for parity.

 

What I think is the right method for my configuration is:

- shrink my data to fit on one 12TB HDD (by deleting thinks or temporary external storage)

- extracting an HDD from synology (so my Synology raid SHR will still run but in degraded mode)

- insert this disk in my unraid Tower and create and array with 1 disk

- moving all my data from NAS to UNRAID

- moving the others 3 HDD stayed in 918+ to unraid and expand array

- add the parity HDD

 

What I don't understand is:

- Will unraid spread automatically the data all over the array when the 4 HDD will be included?

- If not, what manipulation I need to accomplish to make is work?

 

Thanks all for your answers!

 

PS: i'm french so sorry if my english is not good

Edited June 9, 20206 yr by Valiran

52 minutes ago, Valiran said:

What I don't understand is:

- Will unraid spread automatically the data all over the array when the 4 HDD will be included?

- If not, what manipulation I need to accomplish to make is work?

Won't spread automatic. People may moving file by manual or use plugin for that, i.e

 unbalance. But this quite time consuming.

 

52 minutes ago, Valiran said:

but I will buy an extra 12TB for parity.

Best use this disk as data disk in startup instead make Synology in degrade mode.

 

Edited June 2, 20206 yr by Benson

Well so I don't understand how Unraid manage array.

I thought it was actinc like a raid, and having as a default behaviour a will to spread datas all over HDD, like raid 5, like this:

 

https://commons.wikimedia.org/wiki/File:RAID_15.png#/media/Fichier:RAID_15.png

 

With unraid array of 4*12TB of storage and 1*12TB of parity, will my datas be recoverable if I loose a disk?

 

Can I have a unique Share that spread all over my array?

For example, my media share could be 20TB? Or will be media1 of 12TB + media2 of 8TB?

 

Unraid is not RAID, it is file base pooling, file can allocate to different disk, but outside see it is a big share.

 

Parity won't know about filesystem or data, it just protect disk, one parity allow for one disk failure and two parity allow for two disk failure.

Edited June 2, 20206 yr by Benson

Ok, i understand better.

So, for a uniform wear, it is better to spread data all over the array.

 

Great, I have all answers I needed, thanks a lot Benson!