Fault tolerant memory system

A method of memory management comprising:

• responsive to a request to allocate memory for fault protected data:
• allocating first memory in a primary storage device for storing the fault protected data;
• marking an entry in a memory mapping table to indicate that the first memory contains fault protected data;
• allocating second memory for storing one or more copies of the fault protected data;
• and
• recording an association between the first memory and the second memory,
• the method further comprising:
• monitoring a failure rate of the primary storage device;
• and
• determining a number of copies of the fault protected data dependent upon the monitored failure rate.

A method for allocating storage in a memory system comprising a plurality of devices, the method comprising, responsive to a request to allocate storage for data:

• determining the data to be fault protected data or data that is not fault protected;
• determining a level of failure protection for fault protected data dependent upon failure characteristics of the memory system and allocating storage dependent upon the level of failure protection;
• where the level of failure protection comprises one or more of:
• a number of copies of the fault protected data;
• an error correction code of the fault protected data;
• and
• a storage location of the fault protected data,
• the method further comprising:
• monitoring rates of correctable and uncorrectable errors of the plurality of devices of the memory system to provide a measure of device health;
• and
• updating the failure characteristics dependent upon the measured health of the plurality of devices.