Hi ,
I have a Synology DS418 4 bay NAS and I'm running out of space. My NAS is configured as in the tite, and I am considering upgrading the HDs with either 3x6TB drives, or 4x4TB drives. I know to replace 1 drive at a time and wait for the array to rebuild to replace the next. However if I go the 3x6TB route,, how does the system know I want to get rid of the 4th 1TB HD? My understanding is in a RAID 5, I will have 15 TB of unused unrecognized space in a 3 x 6TB + 1TB system. Can I create another volume with this unused space? Should I just replace the drives, reformat the entire thing and repopulate data from a backup?
Thanks