Thanks for all the advice peeps, I had performed the transition and made a disk to be a backup storage!
I would like to share a Short Report on Upgrading/Repairing the Synology 1515+
15-Jan-17
Synology 1515+ webpage @ http://192.168.1.14:5000/
Username: admin
Password: *****
Synology 1515+ was equipped with 2 HGST 6TB 7200RPM HDD.
Disk 1 and Disk 2 was configured to Raid 1, hence a total of 5.5TB allocated to Volume 1.
Disk 1 had suffered a Partition System Error on 23 December 2016.
This cause backup schedule to be disrupted, leaving the data vulnerable.
On 15 Jan 2017,
I had propose a plan to convert the raid 1 system to raid 10, with 1 extra hdd containing backup files.
XXX purchased 3 more HGST 6TB 7200RPM HDD and inserted into Synology 1515+.
I tried to rebuild Raid 1 like @Kernel Stearns said but it took too long, then i realized that most of the files in the HDD are
actually backed-up files from before. Hence i deleted them and crossed
my fingers that disk 2 will not fail
Then,
I had created Volume 2 with a standalone disk, disk 5.
I had copied all data from Disk 2 to Disk 5 first.
Once completed, i formatted and convert Disk 1, 2, 3 and 4 to raid 10, aka Volume 1.
In Volume 1, i had created 7 Folders like before.
\\192.168.1.14\Account
\\192.168.1.14\Administrator
\\192.168.1.14\Contract
\\192.168.1.14\General
\\192.168.1.14\HR
\\192.168.1.14\Others
\\192.168.1.14\Projects
All backed-up files from disk 5 are then copied back to Volume 1 (Raid 10).
In volume 1, i had created a folder "Raid10 backup folder".
Created a backup task in Hyper Backup application.
It is schedule to backup daily at 23:00 hours.
I have enabled Incremental backup with "Reserve the backed up files at the destination"
In volume 2, I had created a folder "backup disk 5"
Created a backup task in Hyper Backup application.
It is schedule to backup daily at 21:00 hours.
I have enabled Incremental backup with "Reserve the backed up files at the destination"
Helped from: https://forum.synology.com/enu/viewtopic.php?f=159&t=58626&p=223832&hilit=incremental#p223832
First backup will run on 16 Jan 2017 21:00 hours.
Currently 5 disk in used.
Volume 1:
Disk 1; 5.5tb
Disk 2; 5.5tb
Disk 3; 5.5tb
Disk 4; 5.5tb
Raid 10 Total capacity: 10.47Tb
Volume 2:
Disk 5; 5.5tb
Raid 0 Total Capacity 5.5tb
Volume 1, 2% used (without backup yet)
Volume 2, 1% used (backed-up files from 14 jan 2017)
Report generated and task carried out by Tsu Wei Quan on 15 Jan 2017
Phone number: +65 96259561
Once again, thanks guys, i appreciate your kind efforts.