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The Dell 12Gb SAS HBA (Non-RAID) External Controller LP provides high-speed connectivity for external SAS storage systems requiring pass-through architecture without RAID management. Built with PCI-e 3.0 support, it connects via dual 2x4 external SAS ports to deliver efficient and reliable data throughput.
Designed for environments needing flexible storage expansion, this low-profile controller supports up to 255 drives with no caching or RAID overhead. It offers a streamlined solution for large-scale external SAS deployments where simplicity, scalability, and performance are key.
Summary of RAID levels Following is a list of the RAID levels supported by the PERC 12 series of cards:
Uses disk striping to provide high data throughput, especially for large files in an environment that requires no data redundancy.
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.
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.
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.
Is a combination of RAID 0 and RAID 1, uses disk striping across mirrored disks. It provides high data throughput and complete data redundancy.
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.
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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