3.1 General considerations for managing external storage3.1.1 Storage controller path selection3.1.2 Guidelines for creating optimal back-end configuration3.1.3 Considerations for compressing and deduplicating back-end3.2 Controller-specific considerations3.2.1 Considerations for DS8000 series3.2.2 IBM XIV Storage System considerations3.2.3 IBM FlashSystem A9000/A9000R considerations3.2.4 FlashSystem 5000, 5100, 7200, 9100, and 9200 considerations3.2.5 IBM FlashSystem 900 considerations3.2.6 Path considerations for third-party storage with EMC VMAX and Hitachi Data Systems3.3 Quorum disks