Planning for erasure code selection

This topic describes the various erasure codes and the factors that need to be considered while you select an erasure code.

Minimizing the risk of data loss due to multiple failures and minimizing disk rebuilds can be done by using 4+3P or 8+3P encoding, at the expense of extra storage overhead.

IBM Storage Scale Erasure Code Edition supports four different erasure codes: 4+2P, 4+3P, 8+2P, and 8+3P in addition to 3WayRepliction and 4WayReplication. Choosing an erasure code involves considering several factors. Examine some of them as follows.