Requested protection settings

Requested protection settings determine the level of hardware failure that a cluster can recover from without suffering data loss.

Requested protection setting
Minimum number of nodes required
Definition
[+1n]
3
The cluster can recover from one drive or node failure without sustaining any data loss.
[+2d:1n]
3
The cluster can recover from two simultaneous drive failures or one node failure without sustaining any data loss.
[+2n]
4
The cluster can recover from two simultaneous drive or node failures without sustaining any data loss.
[+3d:1n]
3
The cluster can recover from three simultaneous drive failures or one node failure without sustaining any data loss.
[+3d:1n1d]
3
The cluster can recover from three simultaneous drive failures or simultaneous failures of one node and one drive without sustaining any data loss.
[+3n]
6
The cluster can recover from three simultaneous drive or node failures without sustaining any data loss.
[+4d:1n]
3
The cluster can recover from four simultaneous drive failures or one node failure without sustaining any data loss.
[+4d:2n]
4
The cluster can recover from four simultaneous drive failures or two node failures without sustaining any data loss.
[+4n]
8
The cluster can recover from four simultaneous drive or node failures without sustaining any data loss.
Nx (Data mirroring)
N

For example, 5x requires a minimum of five nodes.

The cluster can recover from N - 1 drive or node failures without sustaining data loss. For example, 5x protection means that the cluster can recover from four drive or node failures.