On a NetApp E-Series hybrid flash system, which disk configuration optimizes drive rebuild speeds after failure?

The optimal disk configuration for improving drive rebuild speeds after a failure on a NetApp E-Series hybrid flash system is disk pools. Disk pools are designed to enhance performance and flexibility, particularly in scenarios involving reconstruction tasks such as rebuilding data after a drive failure.

In a disk pool configuration, multiple drives are grouped together to create a single pool of storage that allows for efficient data distribution and redundancy mechanisms. This approach can help minimize the time required to rebuild data onto a replacement drive because it utilizes the available resources more effectively, enabling faster access to the data being reconstructed.

Furthermore, disk pools facilitate advanced data protection features, allowing for quicker reconstruction of lost data by paralleling operations across the pool. This can lead to improved I/O performance during rebuilds, thus reducing the overall downtime associated with the failure.

Other configurations, like RAID groups, storage pools, and logical units, while used for different aspects of storage architecture, do not optimize rebuild speeds in the same manner. RAID groups are primarily focused on striping and mirroring data for redundancy, while storage pools and logical units serve different roles within storage management and provisioning.