Synology DS411SLIM manual Manage Volumes or Disk Groups with Storage Manager

			Synology DiskStation User's Guide
				Based on DSM 3.1
RAID Type	HDD #	Allowed	Description	Capacity
		Failed HDD #
			The system will write identical data to each hard	Smallest HDD
RAID 1	2 - 4	(HDD #) - 1	drive at the same time, so data integrity is
				size
			protected when at least one disk is normal.
			This configuration includes a backup option. It	(HDD # – 1) x
RAID 5		1	uses parity mode to store redundant data on
	≧3			(Smallest HDD
			space equal to the size of one disk for later data
				size)
			recovery.
			A RAID 5+Spare storage space requires at least	(HDD # – 2) x
RAID 5+Spare		2	four drives, one of which will act as a hot spare
	≧4			(Smallest HDD
			drive to rebuild the failed drive of the volume
				size)
			automatically.
			RAID 6 provides extra data protection. It uses	(HDD # – 2) x
RAID 6		2	parity mode to store redundant data on space
	≧4			(Smallest HDD
			equal to the size of two disks for later data
				size)
			recovery.
	≧4	1 HDD within	RAID 10 has the performance of RAID 0 and data	(HDD # / 2) x
			protection level of RAID 1. RAID 10 combines two
RAID 10	(even	each RAID 1		(Smallest HDD
			hard drives into a RAID 1 group, and combines all
		group		size)
	number)		the groups with RAID 0.

Manage Volumes or Disk Groups with Storage Manager

Go to Main Menu > Storage Manager and click the Volume or Disk Group tab to create, set up, and manage volumes or Disk Group.

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Chapter 4: Manage Storage Space