Introduction to RAID Arrays and Types

As the administrator of your ggRock system, you must decide based on multiple facets which RAID type your array will be built with.

If data security is of utmost importance, one of RAID 1, RAID 5, RAID 6, or RAID 7 is the best choice.

If performance is of the utmost importance, SingleDrive is the best choice.

Stripe Type: SingleDrive

Disks: One

Striping: None

Benefits: Simplicity

Fault Tolerance: None

Capacity: Total of one drive

Choose SingleDrive only if your data is unimportant due to other factors such as frequent backups, etc.

Stripe Type: RAID 1 - Mirrored

Disks: Multiple

Striping: None (Mirroring)

Benefits: Full fault tolerance, read speed increases with every drive added

Fault Tolerance: Full copy of all data on every drive, so as long as at least one drive survives, all data will be preserved

Capacity: Size of the smallest disk

Choose RAID 1 if your data is of the utmost importance and you have the ability to add numerous drives to your array to make up for capacity limitations.

Stripe Type: RAID 10 - Mirrored and Striped

Disks: Multiple (Even Number)

Striping: Data is striped across all drives

Benefits: Full fault tolerance, read speed increases with every drive added

Fault Tolerance: Data is mirrored for fault tolerance

Capacity: Half the capacity of all disks

Choose RAID 10 if your data is of the utmost importance and you have the ability to add numerous drives to your array to make up for capacity limitations, but would also prefer the performance benefits from a reading and writing perspective that data striping affords.

Stripe Type: RAID 5/RAID-Z - Striping with Distributed Parity

Disks: Multiple (must be at least three)

Striping: Spread across a disk together with a parity separate parity block.

Benefits: You can lose any single disk in the array and still have no loss of data through calculating missing blocks.

Fault Tolerance: Single disk

Capacity: Number of Disks - 1

Choose RAID 5 if your data is important.

Stripe Type: RAID 6/RAID-Z2 - Striping + Distributed Double Parity

Disks: Multiple (must be at least three)

Striping: Spread across a disk together with a parity separate parity block.

Benefits: You can lose any two disks in the array and still have no loss of data through calculating missing blocks.

Fault Tolerance: Double disk

Capacity: Number of disks - 2

Choose RAID 6 if your data is very important.

Stripe Type: RAID 7/RAID-Z3 - Striping + Triple Parity

Disks: Multiple (must be at least four)

Striping: Spread across a disk together with a parity separate parity block.

Benefits: You can lose any two disks in the array and still have no loss of data through calculating missing blocks.

Fault Tolerance: Triple disk

Capacity: Number of disks - 3

Choose RAID 7 if your data is extremely important.

ggRock RAID Configuration

ggRock combines all of your drives into a single storage unit known as a pool.

The functionality of pools for storage permits ggRock to make the best use of various capabilities of the storage you have installed in your server.

Please refer to the Configure ggRock Array section of the ggRock Configuration Manual for further information on RAID configurations available within ggRock.

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