Adapter Specs Model: Front PERC 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 Number: 9K2C2 T4FH6 The Dell PERC 11 H755N (NVMe) Front RAID Controller offers advanced hardware RAID capabilities for modular server environments requiring high-performance storage. Supporting Gen3 and Gen4 NVMe along with SAS and SATA drives, it connects through a 16 Port 2x8 internal configuration using PCI-e 4.0 architecture. Backed by 8GB of non-volatile cache with flash-backed protection, the H755N Front supports RAID levels 0, 1, 5, 6, 10, 50, and 60. It manages up to 16 drives directly or up to 50 drives with a SAS expander, making it ideal for enterprise deployments that demand speed, scalability, and reliability. 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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