Quick Specs Models: Front PERC Drive Types: 12 Gb/s SAS, 6 Gb/s SAS/SATA PCI Support: PCI-e 4.0 SAS Connectors: 16 ports-2x8 Internal Cache Memory: No Cache Write Back Cache: No Cache RAID Levels: 0, 1, 10 Max Drive Support: Up To 32 RAID, or 32 Non-RAID RAID Support: Hardware Part Number: fPERC: TKK9K SAS Cable: X63V7 The Dell PERC 11 H355 Front RAID Controller delivers efficient hardware RAID functionality for enterprise environments requiring front-accessible storage management. With 12Gb/s SAS and 6Gb/s SAS/SATA drive support, it connects through a 16-port 2x8 internal configuration and interfaces via PCI-e 4.0. Supporting RAID levels 0, 1, and 10, the H355 Front Controller manages up to 32 drives in either RAID or non-RAID configurations. Built without onboard cache, it offers a reliable, streamlined solution for servers needing flexible, high-speed, and dependable storage control from the front bay architecture. Summary of RAID levelsSummary 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.
