Minimum declustered array requirements

A declustered array that was initially created with 9 or more non-spare pdisks is called a large declustered array.

Every recovery group must have at least one large declustered array. A large declustered array will always contain vdisk configuration data replicas and may never be reduced in size below 9 non-spare pdisks. Conversely, a declustered array that was created with fewer than 9 non-spare pdisks will never be used to contain VCD replicas regardless of how large it grows.

This is reflected in the configuration data section of the mmvdisk recoverygroup list --fault-tolerance output:


mmvdisk recoverygroup list --recovery-group RG01 --fault-tolerance

                    declustered      VCD spares
configuration data     array     configured  actual  remarks
------------------  -----------  ----------  ------  -------
relocation space    DA2                  11      15  must contain VCD
relocation space    DA1                   0       -  can never contain VCD