Adapter Specs Model: Front PERC (Battery Sold Separately) Drive Types: Gen3 (8 GT/s) NVMe, Gen4 (16 GT/s) NVMe, 12 Gb/s SAS, 6 Gb/s SAS/SATA, 3Gb/s SAS/SATA PCI Support: PCI-e 4.0 SAS Connectors: 16 Port 2x8 Internal Cache Memory: 8GB NV Write Back Cache: Flash Backed Cache Max Drive Support: 16/controller, 50 with SAS Expander (Platform limit) RAID Levels: 0, 1, 5, 6, 10, 50, 60 RAID Support: Hardware Part Numbers: 9K2C2 T4FH6 The Dell PERC 11 H755N (NVMe) Front RAID Controller delivers high-performance hardware RAID functionality for NVMe, SAS, and SATA drives. Designed for front-accessible configurations, it supports PCI-e 4.0 and provides robust storage connectivity with a 16 Port 2x8 internal architecture. Equipped with 8GB of non-volatile cache and flash-backed protection, the H755N Front supports RAID levels 0, 1, 5, 6, 10, 50, and 60. It offers drive scalability up to 16 drives per controller, or up to 50 drives with a SAS expander, meeting the needs of high-performance modular server environments. Summary of RAID levels Summary of RAID levels Following is a list of the RAID levels supported by the PERC 12 series of cards: RAID 0: Uses disk striping to provide high data throughput, especially for large files in an environment that requires no data redundancy. RAID 1: Uses disk mirroring so that data written to one physical disk is simultaneously written to another physical disk. RAID 1 is good for small databases or other applications that require small capacity and complete data redundancy. RAID 5: Uses disk striping and parity data across all physical disks (distributed parity) to provide high data throughput and data redundancy, especially for small random access. RAID 6: Is an extension of RAID 5 and uses an additional parity block. RAID 6 uses block-level striping with two parity blocks distributed across all member disks. RAID 6 provides protection against double disk failures, and failures while a single disk is rebuilding. If you are using only one array, deploying RAID 6 is more effective than deploying a hot spare disk. RAID 10: Is a combination of RAID 0 and RAID 1, uses disk striping across mirrored disks. It provides high data throughput and complete data redundancy. RAID 50: Is a combination of RAID 0 and RAID 5 where a RAID 0 array is striped across RAID 5 elements. RAID 50 requires at least six disks. RAID 60: Is a combination of RAID 0 and RAID 6 where a RAID 0 array is striped across RAID 6 elements. RAID 60 requires at least eight disks.
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