3.1 Internal storage types3.1.1 NVMe storage3.1.2 SAS drives3.1.3 Internal storage considerations3.2 Arrays3.2.1 Supported RAID types3.2.2 Array considerations3.2.3 Compressed array monitoring3.3 General external storage considerations3.3.1 Storage controller path selection3.3.2 Guidelines for creating optimal backend configuration3.3.3 Considerations for compressing and deduplicating back-end3.4 Controller-specific considerations3.4.1 Considerations for DS8000 series3.4.2 Considerations for IBM XIV Storage System3.4.3 Considerations for IBM FlashSystem A9000/A9000R3.4.4 Considerations for FlashSystem 5000, 5100, 5200, 7200, 9100, and 92003.4.5 IBM FlashSystem 900 considerations3.4.6 Path considerations for third-party storage with EMC VMAX and Hitachi Data Systems3.5 Quorum disks