Data protection solutions—HP provides a range of interoperable data protection solutions, from single-server tape drives to autoloaders and tape libraries that integrate with HP and third-party backup software offerings. Comparing drive technologies The differences among the drive technologies include: Solid-state-drives (SSD) Rev. 15.21 4 – 5
HP C&L Stakeholders only. Reproduction in whole or in part without permission is prohibited.Designing HP SMB Storage Solutions •Share the I/O interface technology developed for hard drives •Use electronic interfaces compatible with traditional block (I/O) hard drives •Include a controller that incorporates the electronics that bridge the NAND memory components to the host computer. The controller is an embedded processor that executes firmware-level code and is one of the most important factors of SSD performance. Some of the functions performed by the controller include: Error checking and correction (ECC)Wear levelingManaged via the drive interface board and embedded controller Bad block mappingRead scrubbing and read disturb managementRead and write cachingGarbage collectionEncryption•Ideal for mission-critical server applications, databases and online storage•SMB and enterprise-level for high-performance workloads•Disadvantage is a possible data loss in unpowered drives over longer term•Indispensable for storage array tiering strategiesSAS •Largest capacity available in 15K 6G SAS 2.5-inch hard drives15K RPM drives offer decreased rotational latency •Up to 1 TB capacity in a 6Gb/s SAS 2.5-inch form factor, 15,000 RPM•Ideal for mission-critical server applications and external storage•SMB and enterprise level4 – 6Rev. 15.21
HP C&L Stakeholders only. Reproduction in whole or in part without permission is prohibited.HP Storage SMB Portfolio SAS midline •Up to 3 TB storage capacity•6 Gb/sec data transfer rate•10,000 RPM •SFF (2.5-inch) and LFF (3.5-inch) form factors•Lowest cost per GB •Ideal for non-mission critical environments•SMBSATA/NearlineSAS•Built for low cost with less expensive components•Designed for desktops, PCs, and low-end servers•20% to 30% I/O duty cycle•150 MB/s with better performance in future•Up to 3 TB capacity, 7,200 RPM•SMB and enterprise levelRev. 15.21 4 – 7
HP C&L Stakeholders only. Reproduction in whole or in part without permission is prohibited.Designing HP SMB Storage Solutions NAND flash differentiators With any redundant RAID level, a host-level write operation results in multiple low-level writes to the drives. SSD write operations typically have a higher overhead and generate more background NAND management activity than SSD read operations. In redundant RAID configurations using SSDs, this performance difference is magnified. A redundant array using SSDs might deliver better performance than a hard drive-based array. But the relative fall off in performance as the write load increases is greater for the SSD-based configuration.