Exam DES-1D12 topic 1 question 94 discussion

En Dell Unity XT, los Drive Partnership Groups (DPG) se crean automáticamente en pools dinámicos según el tipo de disco, es decir, cada DPG contiene solo un tipo de disco. Esto implica: 24 x 800 GB SAS Flash 3  1 DPG 24 x 16 TB SAS Flash 3  1 DPG Ambos son Flash 3, y como indica la guía, pueden compartir el mismo DPG si cumplen criterios de diseño interno. Pero debido a la gran diferencia de capacidad (800 GB vs 16 TB), Dell usualmente separa estos en dos DPGs distintos por eficiencia de distribución y reconstrucción. 14 x 400 GB SAS Flash 2  1 DPG Este es de otro tipo de Flash (Flash 2), por lo que requiere su propio DPG.

When a dynamic pool is created or expanded, the selected drives are placed into drive partnership groups. A drive partnership group is a group of drives of the same drive type which are combined into a hidden dynamic pool object. The number of drives placed in each group directly depends on the number and type of drives selected at pool creation, or selected later when the pool is expanded. A dynamic pool always includes at least one drive partnership group, and each drive within a dynamic pool can only be part of a single drive partnership group. For the life of the pool, a drive never changes the drive partnership group that it is part of.

The answer is B (1) One partnership group because the sum of 24+24+14 is 62 and the maximun contained in a partnership gruoup is 64. Dynamic Pools - Architecture Drive Partnership Groups (Continued) • A maximum of 64 drives are contained within a drive partnership group – Limits the number of drives RAID extents can be provisioned from – Limits the number of drives a private RAID Group LUN can cross – When a drive partnership group is full, a new group must be started with the minimum number of drives for the RAID width + 1 drive worth of spare space • Some drive counts cannot be reached within a Pool – Depends directly on the RAID width configured

The correct answer is 2