Конвертация raid в DSM

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https://kb.synology.com/en-us/DSM/help/DSM/StorageManager/storage_pool_change_raid_type?version=7

Drive Requirements

To change the RAID type of a storage pool, you must have a sufficient number of available drives installed in your Synology NAS. The table below shows the minimum number of drives required for each RAID type.

RAID Type

Minimum Number of Drives Required

RAID 1
2

RAID 5
3

RAID 6
4

SHR-2
4 or 5 (depending on the drive configuration of SHR-1)

RAID Type Requirements and Limitations

Only certain RAID types can be changed to other RAID types. For example, RAID 1 can be changed to RAID 5, but RAID 5 cannot be changed to RAID 1. Refer to the table below for details.

Current RAID Type

Possible Conversion Target Type

Additional Number of Drives Required

Basic
RAID 1
1

Basic
RAID 5
2

RAID 1
RAID 5
1

RAID 5
RAID 6
1

SHR-1
SHR-2
1 or 2 (depending on the drive configuration of SHR)

https://kb.synology.com/en-my/DSM/help/DSM/StorageManager/storage_pool_what_is_raid?version=7
Supported RAID Types

This table provides a brief overview of different RAID types supported by Synology NAS, including storage capacity, the minimum number of drives required for the RAID type, and the number of drive failures that can be tolerated before data loss occurs.

RAID Type

Number of Drives

Tolerable Drive Failures

Description

Storage Capacity

SHR
1
0

• Optimizes the volume size when combining drives of different sizes.
• Provides data redundancy if the volume is composed of two or more drives.
• Recommended for beginner users.

1 x (Drive size)

2-3
1
Optimized by the system.

≧4
1-2

Basic
1
0

• Composed of one drive as an independent unit.
• Does not provide data redundancy.

1 x (Drive size)

JBOD
≧1
0

• Combines a collection of drives into a single storage space, with a capacity equal to the sum of all drives' capacity.
• Does not provide data redundancy.

Sum of all Drive sizes

RAID 0
≧2
0

• Features "striping," a process of dividing data into blocks and spreading the data blocks across several drives to enhance performance.
• Does not provide data redundancy.

Sum of all drive sizes

RAID 1
2
1

• Writes identical data to all the drives simultaneously.
• Provides data redundancy.

Smallest drive size

3
2

4
3

RAID 5
≧3
1

• Implements block-level striping with parity data distributed across all member drives, thus providing data redundancy more efficiently than RAID 1.

(N - 1) x (Smallest drive size)

RAID 6
≧4
2

• Implements two layers of data parity to store redundant data equal to the size of two drives, providing a greater degree of data redundancy than RAID 5.
• Supports creating a Btrfs volume of up to 1 PB in size, which is only available on certain Synology NAS models and under specific conditions.

(N - 2) x (Smallest drive size)

RAID 10
≧4
(even number)
Half of the total drives

• Provides the performance of RAID 0 and data protection level of RAID 1, combining drives into groups of two in which data is mirrored.

(N / 2) x (Smallest drive size)

RAID F1
≧3
1

• Implements block-level striping with parity data distributed across all member drives.
• Writes more parity information on a certain drive.
• Recommended for an all-flash array.

(N - 1) x (Smallest SSD size)